LeatherZ just keeps coming out with new ideas and products for the Z3. When I first heard that LeatherZ could recover the stock BMW shift knob with their higher quality leather, I knew I would want to have one. After thinking over the additional color options LeatherZ offered I decided to try something different and go with a two-tone dark gray and black. LeatherZ’s dark gray is an almost perfect match to the dark gray on the seats in my 1998 M roadster, and it’s also a great complement to my LeatherZ covered armrest.
Removing the stock Z3 shift knob is fairly easy, the M series has one additional step due to the lighted face. Basically all you have to do is pull it off. With the M series you’ll want to get under the shift boot first and disconnect the two wire plug. Once I removed my shift knob I mailed it to LeatherZ and waited for its return. I went about a week without a shift knob, surprisingly it wasn’t that big a hindrance to shift without the knob in place.
LeatherZ provided a couple interesting pictures (1, 2) of the shift knob during the recovering process. You can see how the lighted knob is internally wired in these pictures. Once LeatherZ completed the upgrade they mailed the shift knob back to me. Reinstallation was fairly easy, I threaded the 2 wire connector plug through the shift boot and plugged it in. Then noted the “U” shaped pattern to the receiving end of the shift lever, aligned the shift knob and pushed it back down (adding a whack with the heal of my hand for good measure).
I’ve heard of some Z3 owners having shift knobs come off while driving. I wouldn’t recommend using glue but maybe some lock-tight inside the “U” indentation would provide some additional holding strength for those that require it.
LeatherZ Pricing Options:
If LeatherZ provides the shift knob (new):
1. Black, Beige, Dark Gray, or Tanin Red monochromatic or 2-tone Leather Shift Knob – $100.00.
2. Illuminated M-style Leather Shift Knob in Black, Beige, Dark Gray, or Tanin Red monochromatic or 2-tone Leather – $135.00
3. Illuminated M-style Leather Shift Knob in Black, Beige, Dark Gray, or Tanin Red monochromatic or 2-tone Leather with Corrected Amber (not red) LEDs – $165.00
If customer provides shift knob:
1. Black, Beige, Dark Gray, or Tanin Red monochromatic or 2-tone Leather Shift Knob – $40.00.
2. Illuminated M-style Leather Shift Knob in Black, Beige, Dark Gray, or Tanin Red monochromatic or 2-tone Leather – $75.00
3. Illuminated M-style Leather Shift Knob in Black, Beige, Dark Gray, or Tanin Red monochromatic or 2-tone Leather with Corrected Amber (not red) LEDs – $105.00
In most cases the customer can specifiy a different shift pattern insert at no additional charge.
LeatherZ is also planning to carry BMW brushed and matte chrome (real metal) shift knobs that also illuminate. These knobs are shorter than stock and should be similar to the one in this article.
Just added a new polished aluminum shift knob which replaces my illuminated shift knob. I like the feel of the polished aluminum much better than leather. This polished aluminum knob is also shorter than the illuminated knob, so the shifts between gears feel a lot sportier.
Update: Jon Maddux sent pictures of some additional BMW shift knobs and their BMW part numbers. There are several kinds of “chrome” shift knobs available from BMW. They have subtle differences, but before you drop $70+ on a shift knob, they are worth noting. Note that both “bright” knobs are plastic. The brushed and matte knobs are solid aluminum. Ron Styger reports the weight of the different knobs are .081kg (25-11-1-434-003), .079kg (25-11-2-492-481), 0.132kg (82-23-9-405-686) and 0.128 (25-11-9-416-257). Retail prices are $85 for (25-11-1-434-003), $65 for (25-11-2-492-481), and $98.25 for (25-11-9-416-257).
|Pros:||Increased shift feel, great looks|
|Cons:||Cold/hot to the touch depending on the season|
|Cost:||$139 from Titanium Cavallino|
Short shift kits have become a popular upgrade for Z3 owners, but the good kits can be quite expensive. The popular UUC short shift kit, reviewed elsewhere on the ///MZ3.net, is $300 and the imported AC Schnitzer shifter—try that five times real fast—is an eye watering $1000+. Richard Carlson’s ///MZ3.net article on short shifters, ‘The Short End of the Stick’, offers a clear overview of the concepts and techniques involved in designing an effective short shift kit, and touches briefly on a low-cost approach to improved shift feel—a shorter shift knob. Richard experimented with an inexpensive round plastic ball, which he admits didn’t enhance the appearance of the cockpit, but which did result in snappier shifts.
Compare Stock vs 130R
Titanium Cavallino offers an attractive shift knob which they call the 130R knob. Styled along the lines of the classic Ferrari round knob, the 130R is beautifully presented in polished titanium, and is 9/16″ shorter than the stock BMW knob. If you’re wondering whether a 9/16″ shorter knob will make any difference, refer again to Richard Carlson’s article. He presents a table which indicates that a 3/4″ shorter shifter on an M Roadster would result in a 12% reduction in throw. I figure that the 130R will shorten throw by 8-10%. Additionally, the 130R weighs 9 ounces—5.5 ounces more than the stock knob. That extra heft should further improve the new short-shift feel.
Unlike many aftermarket knobs, the 130R is designed expressly for the BMW. This means that, rather than being installed using set screws, the 130R is fixed to the shift lever in the same way that BMW engineers have designed for the stock knob; a snap ring arrangement to hold the knob on the shaft and, to prevent turning, a pin inside the knob which engages a notch in the top of the shaft. Once properly installed the knob cannot rotate, and it would take 80 pounds of vertical pull to remove. If you worry about the knob coming off in your hand in the middle of a fast sweeper, this is the only way to go.
Installation is quite easy. Remove the stock knob by grasping it firmly with two hands and giving it a strong upward yank. Careful that your chin isn’t in the way! Knobs with internal lighting have a long enough wire that breaking the wire shouldn’t be a problem, but take care. If the knob is wired then lift the edges of the shift boot, locate the connector at the end of the wire, unplug it, then thread the wire and connector through the shaft hole in the boot. Installation of the new knob is just the reverse. Slide the knob down over the shaft, insuring that the internal pin is aligned with the notch in the top of the shaft, then press down until the snap ring engages. Done!
Road test time! So, what does it feel like? As expected, it doesn’t change the feel in any revolutionary way. The throw is tightened up, and the extra weight of the knob adds some inertia which helps the shifter across the gate. To my eye the looks are wonderful, but don’t leave the car outside with the top down or you may burn your hand. At the other end of the temperature spectrum, the knob is unpleasantly cold to the touch until it picks up warmth from your hand. I particularly like the standard BMW mounting method and, on balance, I consider this a worthwhile addition to my M Roadster—at least until Santa brings me a UUC shifter.
|Pros:||Reduced shift throw, solid shifts (no “play” in linkage)|
|Cons:||Requires some crawling on the ground if you don’t have access to a lift|
|Cost:||List price: $300 (from UUC motorwerks)|
The UUC motorwerks M roadster/coupe short shift kit comes with all the parts you need to reduce the shift throw of your M roadster or coupe by 15-20%. The kit includes a replacement M roadster shifter lever with a custom bend in it, a CNC machined adaptor to mate the shift lever to the shift selector rod, all clips, pins, washers, and lubricant needed for the installation, replacement Delrin bushings for the shift carrier, and a special tool for removal of the shifter cup.
The kit also comes with a 17-page booklet detailing every aspect of the installation. The instructions are detailed, but it is wise to take some time to familiarize yourself with all the different terms used before beginning, and to constantly go between looking at the parts on the car and the pictures and descriptions in the booklet. If you don’t know what all the parts are (I didn’t when I started), it may not be immediately obvious what the “carrier” is, for example.
Besides all the parts in the kit, you will need some tools. An 8mm hex bit or 8mm allen hex wrench is absolutely necessary. You will also need some blue “Loctite” threadlock. A small hammer may be necessary to tap some things into place, and a flashlight is a must. A large flat-bladed screwdriver is needed, and snap ring pliers (tips to the side, not straight out) and work gloves are recommended although not absolutely necessary (I made do without them, but having them would have made the job easier). You will also either need access to a lift (recommended if you have any chance to get your car on one) or jackstands to lift the front of the car. Two final notes before beginning: First, make sure the car is cool. You will be working all around the exhaust. Second, some parts of the installation are almost impossible without two people. For example, sometimes one person will need to be under the car, working to attach something to the bottom of the shift lever, and at that time it is very useful if you have someone else above the car to hold the shift lever in place and keep it from flopping around.
Step 1 is to remove the shift knob by pulling up on it forcefully. Be careful not to mash your nose, and also be careful not to rip loose the wires for the lighted shift knob that M roadster and coupes feature. After you have the shift knob loose, pull on the leather boot on the sides towards the center and lift the boot up. This will expose a foam insulating insert which covers the connection to the lighted shift knob.
Tug the foam insert up out of the way and unplug the connector for the lighted shift knob. You should now be able to set the shift knob, leather boot, and foam insert to the side.
If you feel like having a little fun at this point, you could try driving your car around the block using just the stub of the shift lever–the effort is noticeably increased, but you get a great Miata-like feel to the shifter. This just makes you look forward to getting the short shift kit fully installed!
Notice in the pic of the bare shift lever that there is a rubber boot around its base. Your next step is going to be to pull up on it to remove it.
Once the rubber boot is off, you can see the top of the aluminum carrier. In this is the nylon cup which holds the ball of the shift lever in place.
Now that the rubber boot is out of the way, push the shift lever to the right and look down on the left hand side of the carrier underneath it. You should see a circlip. This clip is what is holding the selector rod in place in the hole in the bottom of the stock shift lever. You can push the clip off with a screwdriver, use a pair of snap ring pliers to remove it, or push it off with a gloved hand. After removing it, remove the small yellow washer and you should then be able to push the selector rod pin out of the shift lever.
I was naive about how the shifter lever in an M roadster actually connected to the transmission. I had no idea what a “carrier” was. The carrier is a metal piece that attacnes to the top rear of the transmission and extends rearward into a rubber fitting behind the shift area. The shift lever itself has a round ball that mounts into a nylon cup which fits in the circular area of the carrier. The bottom of the shift lever is under the carrier and attaches to a selector rod which extends forward to the transmission. The UUC instructions are about to tell you to remove the nylon cup and then to remove the carrier. This is a picture of the carrier next to the car so you can realize how long it is–this will keep you from a little bit of puzzlement as you try to figure out where various clips are (that you need to remove) in relation to the shifter lever.
I’m going to fast forward a bit in the installation. The instruction booklet from UUC contained better pictures than I could take with my camera–since I didn’t have the car on a lift, I just didn’t have room to try to take any pictures from under the car. The UUC instructions clearly take you through removing the shifter cup (either with the supplied shifter cup removal tool or, in a pinch, with a pair of small screwdrivers). The instructions then take you through removing a clip/pin that attaches the front of the carrier to the top of the transmission. Take your time feeling out where the carrier ends and where this clip is. It is not immediately obvious and is hard, if not impossible, to see–you just have to feel along. The clip can be hard to pry up–as the instructions say, “some cursing and swearing tends to make the job easier”. I really recommend trying this tip, as it really works!
Once you have the carrier out of the car (see picture above of it laying next to the car), you can remove the stock rubber bushing shown already out at lower right in this picture) and replace it with the Delrin bushings shown on either side of the hole in the carrier in this picture.
Before reinstalling the carrier, you need to flip the selector rod (which is currently still attached at the transmission end) from side to side and end to end. You will need to remove a circlip from it at the transmission end just like you did at the shift lever end. Make sure to note where yellow washers are used when you take it off and put new ones (supplied with the UUC kit) in place when you reinstall the selector rod. When you take the selector rod out, you should see that in its original position, it had its pins pointing towards the left side of the car, and had a “kink” or bend in it near the transmission end, which bend “pointed” up, giving the rod a little clearance over the driveshaft. When you flip the rod end to end and side to side, you will be reinstalling it with the pins pointing to the right side of the car. If done properly, the kink will now be towards the rear of the car and will still be pointing “up”. This is important to maintain clearance of the drive shaft.
After moving the selector rod, you now need to reinstall the carrier. Again, the clip that fastens it to the transmission is going to give you fits. UUC provides a replacement clip, which you need because you will probably destroy the original clip when you remove it. Make sure to get the replacement clip snapped down all the way when you install it.
Once the carrier is back in place, you should slip the UUC-provided new nylon cup over the ball of the shift lever, slide the cup into the hole in the carrier, and snap it into place as per the instructions. Use the provided grease to lubricate the ball of the shifter before placing it in the nylon cup. Unlike the stock lever (shown at bottom of picture), the UUC lever (top of picture) has a bend in it. Make sure that the lever leans towards the back of the car, and that the bottom part of the lever is also pointing towards the back of the car.
You now will install the supplied adaptor onto the bottom of the shift lever. Note that it can be installed in one of two positions. You should install it in the 15% reduction position to match the way you have now flipped the selector rod. Continue with the instructions to attach the selector rod to the adaptor.
Back to the rubber boot–after you have the shift linkage reassembled, and you have tested your way through the gears, you need to reinstall the rubber boot. The instructions do tell you to make sure to get the bottom of the rubber boot around the top “lip” of the carrier. However, they don’t say that the best way to do this is probably from beneath the car. Get your fingers up in there and tug the boot down around this lip–this is important to keep dirt from getting in the pivot point of the shift mechanism. After reinstalling the rubber boot, reinstall the foam insulation, reconnect the lighted shifter wires, and reinstall the leather boot and shift knob, all in the opposite of the order in which you took them off.
gear pair Stock
4-5 3 11/16″
3 11/16″ 3 3/16″
3 1/4″ 1/2″
7/16″ So, what is it like when you are done? I took the following measurements. In general, the UUC short shift kit reduces the throw about one-half of an inch between each pair of gears. This may not sound like a lot at first, but it certainly feels different when shifting and is a very nice change. The shifter feels like it should have come this way from the factory.
The animation below shows the stock shifter on the left and the UUC shifter on the right. This gives you some idea of what it is like to shorten your shift throw the UUC way.
All in all, I recommend the UUC short shift kit. The installation is difficult for a first-timer, but having been through it once, I think it would be much easier the second time around now that I know where all the components are and what they look like. It feels great in my car, and I have been enjoying it each day since I installed it.
Discuss this article and other Convenience upgrades in the
///MZ3.Net discussion forum.
The Short End of the Stick
(A romp in the Connecticut woods with some seriously height-impaired shift levers)
Ron Stygar is a man of small tolerances. – Very small tolerances.
In engineering terms a tolerance is a lack of precision. Manufacturers build in many tolerances into their product. There are many reasons for this. Sometimes tolerances give you an added measure of safety. Sometimes, however, tolerances are merely a way of appealing to the most common tastes or a way of saving money. The shifter on the Z3 is a perfect example. The shifter in most Z’s feels like it belongs in a family hauler instead of a low-slung sports car.
Ron does not like this type of engineering tolerance. He believes in precision in his gear shifting and has invested a serious amount of time developing an approach, which both preserves your warranty (mostly) and offers you some serious short shifting fun. In addition, he’s come up with a magic do-hickey to improve your driving (more on this later).
Row Row Row your gears…
OK, so a little exercise is not a bad thing, but don’t we live in a world of modern-day laborsaving devices? Turns out we do.
It was Ben Liaw who first noticed that a significant change had been made between the M3 and the MZ3 shift levers. Ben took the shifter from the MZ3 and transplanted it into his M3, making short-shifting history. A number of people followed his lead, transplanting the heart of motorsport shifting into their more mundane vehicles, resulting in a serious amount of short shifting fun. But the fun was not without a price – the transplant of MZ3 shifters into 1.9-Z3’s resulted in issues with 5th gear hitting the transmission tunnel, but more seriously, while 328, 2.8-Z3 and 1.9-Z3 owners were enjoying the fun, MZ3 owners were left out of the party.
Enter Ron Stygar…
Ron goes back a bunch of years with BMWs. He has a 318ti with and ///M Coupe on order. In addition to his many other projects with his cars, Ron has spent a year investigating the ins and outs, ups and downs and the backs and forths of BMW shifters.
Ron has developed a number of shift levers, which just scream short shifting fun! At the prompting of Jon Maddux (the leather guy), Ron sent me a picture of some of his creations a while ago and invited me down to sample them in my Z3-2.8. Ron had heard that I had upgraded to the MZ3 shifter, but had gone a little further – I had dropped the height of my shifter by installing a round aftermarket knob. This, effectively, shortened the shifter another inch. The upside was seriously short shifts. The downside is the loss of the gorgeous BMW knob.
Ron said he had the solution.
It seemed like a good day for bug collecting, so I headed south to rural Connecticut where Ron does his work.
What I found when I got there was a meticulous garage, a workshop complete with fiche reader, and loads of special tools which Ron makes himself. Ron was interested in trying a number of prototype shortened MZ3 shift levers on my car. The plan was to start with the standard 2.8-Z3 shifter and work our way down to his most shortened unit. Along the way we would take key metrics:
The height of the stick (with the standard BMW knob),
The length of the throw from 3rd to 4th and the amount of force needed to shift from 3rd to neutral and from neutral to 4th.
We would tabulate these metrics into a guide for shift-lever reduction.
Give me a lever long enough to move the world, a fulcrum big enough and a place to stand and I will break my lever!
Short Shifting in concept is an easy thing to comprehend if you think of the basic physics of a lever. A lever has two parts: the lever and the fulcrum.
The most common lever we are familiar with is a seesaw. Remember when we were kids and the seesaws had several adjustments, which allowed you to lengthen the lever on one side and shorten it on the other? The purpose of this arrangement was to allow you to distribute force in the most effective way. The lighter kid would sit on the longer side, the heavier kid on the short side. Do it right and each kid exerted the same amount of force. The difference was in the length of the lever on their side of the fulcrum. The longer side of the lever takes less force to move, but translates the force over a shorter span on the short side. The lever is a classic force multiplier.
If you imagine the seesaw stood on end, you’ve got your shift mechanism. The lever is your shifter. The fulcrum is the pivot ball which sits under your shift boot. In general, if the longer end of the lever is on the top, you will have to travel more to move the shorter end any significant amount, but it will be easy to move. This is the situation right out of the box. The advantage is that it’s easy for everyone to move the lever because of the force multiplication of the long end.
But it’s not much fun.
Adjusting the See Saw…
You can shorten the shift in a couple of ways: You can “adjust the see-saw” by extending the shift lever below the pivot ball. This is basically what the MZ3 shifter does in the 2.8-Z3 and 1.9-Z3 applications. This has the effect of slightly increasing the effort needed to shift, but it’s really not all that noticeable.
However, the 1.9-Z3 shifter has and additional twist – or rather an additional turn: it’s bent. The bend in the lever accommodates the different transmission in the 1.9-Z3. In the 1.9-Z3 implementation, the straight MZ3 shifter results in the bottom of the shifter and the transmission being seriously out of line, resulting in a condition called “notchiness”, or the difficulty in getting into gear. When you replace a bent 1.9-Z3 shifter with a straight MZ3 shifter, you can compensate for the increased vertical off-axis force by raising the fulcrum point of the lever. Ben Liaw sells a kit call the “ERK” (Effort Reducing Kit”) which allows you to do this. Luckily, in the 2.8-Z3 the difference in height is negligible, so this does not become an issue.
Where’s my Chainsaw?
Another way of changing the relationship of the lever in the shifter is by taking a more radical approach: Shorten the top of the lever.
Using this approach, you can, effectively, shorten the throw down to just about nothing, but there is a cost: as you shorten the upper part of the lever, the force needed to move the bottom part increases. Any reduction in shift throw results in an increased effort regardless of the method you choose to shorten the throw. Remember how the lever works. Extending the length below the pivot ball as well as shortening the length above the pivot ball will result in increased shifting force Shortening the upper part of the lever is the heart of Ron’s idea for short shifting the MZ3. Although Ron chose to shorten the prototype levers 3/4, 1 1/8, and 1 1/2 inch, to equate with a 5% , 10% and 15% reduction, this distance could be any value in between.
It’s actually quite a simple approach. It also leaves all the important parts, those below the lever, in the same relationship and generally intact. Other short shifting kits sold for the Z tend to replace more components, thus encroaching on your warranty. Ron’s approach trades off increased effort in exchange for a more standard implementation where it really counts. The question has always been – how much effort?
That was what we intended to find out.
The Measure of Success
Ron had created several prototypes of shortened sticks from BMW ///MZ3 shifters. Each change in length reduces the throw by five percent: The sticks were shortened by 3/4, 1 and 1/8, and 1 and 1/2 inches. We set out to measure the differences in throw and effort between both the standard 2.8-Z3 shifter, the ///MZ3 shifter and Ron’s shortened ///MZ3 shifters.
Jack of all Trades
Ron is an amazing guy. Not only is his garage neater than just about any room in my house, but he has the most incredible collection of tools, many of them specially made for the sole purpose of swapping out BMW shifters. The first hurdle was to get the car jacked up. Not an easy task. First of all, floor jacks don’t work because the nose is so close to the ground, same problem with ramps. Solution: Ron had built a set of “mini-ramps” which raised the car enough to get the jack under. Next problem: standard jack stands won’t fit the indentations on the bottom of the Z3 at the jack points.
Solution: Ron has built a set of adaptors for jack stands, which exactly fit the Z3. (Ron actually sells jack-stands modified to fit BMW’s, he has been asked by an owner to create a set of jack stands which will fit his Z3, but that’s another story). Once the car was up on the stands, we inserted standard ramps under the front wheels as a backup. We also chucked the rear wheels using Ron’s modified Tru-Cut chucks in the back of the car. This car was not going anywhere!
Mr. Wizzard Goes To Work
We measured the height of the MZ3 shifter with the modified aftermarket knob, then put everything back to standard 2.8. We then measured the height of the standard 2.8 shifter, removed the knob and measured the throw from 3rd to 4th.
We then used a calibrated scale to test the force needed to move the shifter from 3rd to neutral, then from neutral to 4th. By this point I thought I was back in Mr. Wizard’s physics class. Only Mr. Wizard was nowhere near as precise as Ron was!
How to shorten a Shifter
Ron, with the help of Manoj Mehta, Alan Alfano and his coworker Jim Guyan has come up with a way to shorten the upper portion of a shift lever that works well. He and his friend Alan Alfano have been dissecting BMW shift related parts for about a year now.
They cut apart a number of shifters to find out how they are constructed. They’ve discovered a couple of things about how the units are made: The shifter is a rod within a rubbery substance, surrounded by a metal shell. The purpose of the rubber is to isolate shift knob from the vibration and heat of the transmission. The upper portion of the inner rubber is glued to the inner rod. The lower portion is not.
Ron with the help from his dedicated and fanatical crew (OK, he buys them beer) has discovered a way of removing the outer casing from the unit without damaging it. They then cut down the top of inner rubber core to the desired length, while, at the same time cutting down the bottom of the outer casing to match. Afterwards, they re-glue the shortened parts together and polish the unit to a dazzling brilliance. The end product rivals BMW for workmanship.
Instead of adonizing the stick, Ron polishes his to a high gloss
Ron also bends the ///MZ3 shifter to fit the M3/328 (and, presumably, the 1.9-Z3). His method uses a number of specially machined parts, which places no stress on the shift lever. The bending tool and clamping pieces were made by Alan’s Dad. Ron places the shifter into a vice and bends it to an angle and length known only to High School Math teachers.”When we first started to bend these things”, said Ron, “we assumed that the angle should be the same as the OEM shifter. But it turns out, that this results in the top of the shift lever being too far back, depending on the car. The increased length below the pivot ball, brings the top of the shift lever back”. That was way too much tolerance for a guy like Ron. He wanted precision, so he calculated the X-Y delta between the stock and new lever and bent the new lever accordingly. The new lever duplicates the position of the stock lever in neutral accommodating the height of the new lever.
Note: of course this does not apply in the 2.8-Z3 since the stick in both the ///M and the 2.8 are straight to begin with.
SAT’s (Shifting Attitude Test)
In order to quickly swap out the shifter, Ron developed several special tools to do the job. The first mimics the BMW tool used to remove the nylon cup from the carrier. Unfortunately, the tool must be applied from underneath the shifter, a tight squeeze. We loosened the heat shield under the car to make room. Once you reach it, a simple turn and the tool unhooks the nylon cup and the shifter pops out the top. “You know, a smart guy like you should figure out how to remove this things from the top, then anyone could do it”, I said. I guess Ron took this as a challenge to his engineering prowess, because a couple of weeks later, he sent me a picture of his new tool — the Upper Cup Removal tool. Unlike the BMW tool, this can be used from the top, significantly simplifying the job. Ron’s the only one in the world who makes these things.
We used another special tool, a bent screwdriver to remove the clip, which secures the bottom of the shifter to the rod, which connects with the transmission.
Using Ron’s tools, a shifter can be removed in a minute or so. You simply follow the reverse procedure, making sure the nylon cup is aligned properly for reinstallation. Push the securing back on and the new shifter is in. In the Z3, there is actually no need to remove the carrier or other parts to change the shifter. However, we did discover one “gotcha” — when reinstalling the rubber boot on the shifter at the end of the day we found out how hard it is to actually reseat the boot properly. There is actually a “lip” which needs to be hooked below the carrier. Ron’s tool which is designed to reseat the lip around the carrier in a 328 does not work in a Z3. We somehow managed to do it through brute force. Most do-it-yourselfers (like me!) tend to just let the boot sit on top of the carrier when they are done. The problem is that it will then get dirty and gritty, sure recipie for trouble down the road. Luckily, there was no need to reinstall the boot every time, instead we just swapped out the shift levers to take our measurements.
Even with the special tools, it still took us the whole afternoon to test all the sticks (and we weren’t even drinking beer yet!). The results are tabulated below:
|Height “||Change “||Throw “||Reduction “||Change||Change||Force1||Change||Force2||Change|
The table shows the results of our obsevations in white and the calculations in gray. Force 1 is the force needed to go from third to neutral and Force 2 is that needed to go from neutral to fourth as measured by Ron’s force meter.
Basically, we found what we expected — as you decrease the length of the shaft, the effort to shift increases. We found that for every third of an inch the shaft was shortened, the effort increased by about 3/4 of a pound of force. Although it does not sound like much, it does tend to add up when you get down to the shortest stick. However, the increase in effort for all sticks was still in the “quite acceptable, thank you” category.
In addition to the metrics, I also offer my subjective impressions of the various levers:
2.8 Standard– Effort to shift is very light, but the throw is enormous. Coming from a Miata, the standard Z3 shifter feels like a giant step in the wrong direction. Feels like I’m driving my Maxima.
3.2 (//M) standard– Better, feels much more like a sports car should, but there seems to be room for improvement. There does not seem to be a great deal of effort or increase in notchiness by stepping to the //M shifter, even though the figures show that this is the largest increase in the force figures. If you’re looking for a marginal improvement, nothing drastic, in fact, something that even a BMW tech could not detect, this is the way to go. If you’re looking for something more read on.
3/4″ short– Effort is still very reasonable, but the shift throw is starting to come down significantly. But there still feels like there’s room for improvement. Personally, I think this stick falls into the gray area of either “too short” or “not short enough”, depending on what you’re looking for. Interesting side note: This is the stick which closely approximates the Miata throw. However, because the standard BMW knob is taller than the standard Miata knob, the final throw is more losely approximated with the 1 1/8th short.
1 1/8″ short – This was my favorite. When we measured the height of the standard knob with this unit it was almost exactly equal to the height of my aftermarket knob on the //M shifter. I’ve been very happy with the throw reduction, but this unit allowed me to use the standard knob. Very Nice! This definitely qualifies as a short-shift implementation. The shifts are more than an inch shorter than the standard 2.8-Z3 shaft and about 1/2-inch shorter than the MZ3 shaft.
1 1/2″ short– This approach was a little too extreme for me. Although it gives you toggle-switch-like performance, the effort increase and the notchiness were beginning to show, but not actually to the extreme where it was unmanageable, but the knob had begun to sink into the shifter well and getting into reverse was starting to be a pain. In addition, the reduction of the amount of external metal sleeve was beginning to show. I would have some questions about the longevity of this diminutive stick with a heavy-handed shifter.
The ///MZ3 shifter in a 2.8-Z3 results in about a 17% reduction in the throw. The 1 1/8th shortened lever results in another 17% improvement over the ///MZ3 shifter. Ron figures that a 30 to 40 percent reduction in throw is about optimal. Anything more than that is too extreme in his opinion. The 1 1/8th short results in about a 30% reduction from the standard 2.8 shifter.
Conclusion: if you were happy with the upgrade to the //M shifter, you’ll be twice as happy with the 1 1/8th short.
In the end, I decided to leave the short stick in my car. It allowed me to get the same performance I was getting from my aftermarket knob, but with the standard BMW knob which matched my dash. In addition, it also gave me an additional feature: by keeping aftermarket knob for “special occasions” I can shorten the shifter by another inch to almost the same dimensions as the 1 1/2 short! It’s a nice option if I feel the need for the occasional bout of “toggle-switch shifting”. If you’re interested, Ron is still looking for someone with an ///M to go through the same exercise with.
You want one of these bad!
Before I left, Ron showed me another special modification. It’s very simple: it’s an adjustable clutch stop.
If you look at the carpet floor in back of your clutch pedal, you’ll see a small black knob. The purpose of the knob is to stop your clutch at the end of it’s travel (it’s a sort of cushion). BMW has actually engineered in another tolerance in the clutch: the last 3 or 4 inches of travel don’t actually do anything!
Try it: Sit in your car with plenty of space in front of you. Shift into first and slowly let up on the clutch. Try to figure out the exact point that the clutch catches then press your foot down slightly. Look down at the floor and notice the amount of space till you hit the floor. What a waste! When you shift, if you are pressing your foot to the floor, you spending close to six inches of travel time in the tolerance zone.BORING!
Ron has the solution: This little do-hickey replaces your standard clutch stop, allowing you to raise it up. This prevents you from going all the way down to the floor with every shift. The result is a much quicker uptake from the clutch and a much faster launch. In fact, as I found out in front of a gang of bikers at a rest stop, it may be such a quick uptake that you’ll end up stalling out the first couple of times. (The bikers were actually very nice and waited to make fun of me until I left the parking lot).
This is the next best thing to sliced bread. Ron sells these things, but he also has a page to show you how to build one yourself. Believe me, if you can get your hands on one of these, do so ASAP!
Ron has indicated that he will soon be retiring from his job at the East Hartford, CT Pratt & Whitney motor mill. Ron helps maintain the computer / instrumentation systems facilities used in testing the F100 military jet engines. Although he now does things by request, he plans to offer his shortened shifters (and all his other neat thingees!) on a small commercial basis in the near future. If the quality of the work he did on the prototypes can hold up in production, I predict he’s got a ready market out there.
The smile never left my face in the 99 miles of driving back to Boston from Ron’s house. I parked just long enough to jot down these notes and switch to my “short-shorts” aftermarket knob (which shortens the shift by another inch!). Time to take my precision instrument out on the road again!
Postscript: If you think this modification was cool, let Ron know. If you’re hard up for projects for excuses to spend time with your car, Ron can help. Check out his web page which lists more than 120 separate articles with pictures showing stuff Ron has done with his and other BMWs.
Discuss this article and other Convenience upgrades in the
///MZ3.Net discussion forum.
Since you can never have enough chrome in an M Roadster (open to debate, perhaps) I decided to add the BMW chrome gearshift knob. However, if I did that I would loose that cool lighting effect from the stock gearshift knob. I decided to try and make a chrome lighted gearshift knob.
You will need to remove the standard shift knob. Lift the cover up around it (it’s just held in place by small tabs on the side), and find the connectors for the wires leading to the knob. Disconnect these and simply pull straight up on the knob. It’s tight, but it should come off. Be careful not to hit yourself while pulling it up.
The first thing I did was to take apart the stock knob to see how it worked. It’s really just 3 tiny LEDS and a resistor under a knob emblem that let’s light shine through. Since BMW does not sell this emblem as a separate piece, you will need the one from the stock knob. Put your fingernail under the edge and simply pry up. It’s held on by double-sticky tape and should come off easily. Be careful not to scratch either side. Also important, the “silver” look of the numbers is not really paint. It’s some sort of dust that very easily wipes off. Do not get your finger anywhere near it, or you’ve just ruined the emblem.
The next thing you will need is the wire connector off the standard gearshift knob. Cut the wires (but leave some space to work with). I choose to get some nylon connectors from a local electronics store and solder it on the end of the BMW connector. That way I can still take my knob off without dealing with the BMW connector (which is a little big and won’t come off though the hole in the cover that easily).
Now it’s time to work on the chrome knob (which you need to purchase, of course). You need to get the emblem off without scratching the knob itself. The knob itself is covered in some sort of thin film that protects the metal (which is very soft). If you scratch the knob, it will look BAD. So don’t do that *smile*. The emblem is held on by the same double-sticky tape, but lots more or it. The best way I found is to use a dremel and drill directly into the center of the emblem with the dremel screw-like attachment, then yank the emblem off. Remove the remaining double-sticky tape, but save it – you will need it later.
Under the emblem you will find a little hole which is almost the right size. If you were to put the M emblem over this hole, the “R” and the “5” would not light up, because the hole isn’t big enough. Carefully grind the edges away where those two spaces would be (i.e. instead of a round hole, you would create a hole that looked like it had mickey-mouse ears). You don’t need to go very deep, long enough so that light can shine through. Now look at the underside of the knob. Inside you will see a couple horizontal plastic bars that hold the knob in place and keep it from spinning around. Through the center of the knob (in the hole on the top) drill out a vertical line that intersects the horizontal bar. Go all the way through till it’s completely open. You are almost done at this point.
Go back to your car. Figure out where that horizontal bar would go (it’s plainly obvious). Now cut (grind, actually) a small groove down one side of the stick. It doesn’t need to be very big, but you need something to run the wires in. On the stock knob, the wires actually run along the outside of the knob, but with the chrome knob we can’t do that so we need this grove. It won’t affect the functionality at all, there’s still PLENTY of metal left. When I did this, I took a vacuum and left it up close to where I was grinding to keep all the particles from spraying through the inside of my car.
Back to the chrome knob. Take some very small gauge wire (I used the individual strands of a telephone wire) cut two 18″ pieces. One one side, solder an LED to it. I used a jumbo orange LED from radio shack, their part number is 276-206 and the color matches the rest of the car pretty well. On the other end of one of the wires solder a 470 ohm resistor. Then solder on the mating end of the connector that you soldered on the BMW connector.
Go back to the car. Thread the connector attached to the knob through the leather shifter cover, and place the cover back on the car. Now carefully place the chrome knob on the car. Line up the wires in the groove you cut and on the top have the wires come out next to the horizontal bar (i.e. the LED [attached to the wires] still isn’t in it’s final position, it’s sticking out further). If you did everything right, the knob should be in position and on tightly, but if you hold both ends of the wires you can gently slide the LED back and forth. Pull on the wires until the LED is flush in the hole.
Lastly, you need to put a diffuser and the emblem back on. For a diffuser, you can use the white plastic one from the stock shifter, or simply cut a piece of white paper in the appropriate size. Use that double sticky tape you saved earlier to put the emblem back on. Re-connect the wires and put the leather cover back in place, and you are all set!
Another thing to watch out for is to test-fit the emblem into the chrome knob. I’ve had two different knobs, in one the M emblem fit just fine, but in the other I had to slightly grind the emblem down to get it to fit. Also, be careful not to push too hard getting the emblem in place, it CAN crack internally and have ugly white lines running through it. In direct sunlight, the knob can get VERY hot – so you may want a pair of driving gloves. And the wires you use to connect the LED can get damaged very easy, so if you take the knob off again you may want to plan to replace those wires.
All in all, I’m happy with my unique shift knob!