G Power Supercharger

* g-power supercharger with 405 hp

* complete stainless steel exhaust system

* Porsche brake with 322mm brake discs

* KW-height and hardness adjustable suspension (very low)

* No Door Locks

* No rear Screen Wiper

* No antenna

* No BMW signs

* Rear spoiler in car colour

* Strut brace

* wheel spacers 5mm front, 20mm rear

* 265/40 on rear axis

* Plastic coated wheels (black)

* White indicator bulbs front and rear

* clutch stop

* 32cm diameter steering wheel with full size airbag

Coming Soon… More details and photos

Under The Hood

Before – One of the pleasures of owning an M roadser is to show off your engine.

After – I decided to add a little more spice in the look of it. I started to add some chrome accent. Most of the parts came from Ron J. Stygar expect for the strut bar, which came from Paul Ebeyer Sr.

After – Here’s what I’ve added;

* Battery Ground post

* Diagnostic connector cap

* Engine Lift point

* Oil filter lid

* Oil filter cap

* Radiator Cap

* Steering pump cap

* Radiator Spacer screws

* Valve cover nuts and washers

* Various Z8 nuts

* Windshield wiper jug screw

After doing so I felt that I could go the extra mile and have my valve cover and fuel line cover painted in Imola Red. Needless to say that I was really impress with the result.

I bought a new set of cover since I have use a lot of Armorall of these cover. My dealer told me that even if he would prep the cover very well, I could end up with fish eye on the cover.

After – Here’s the part number for the covers

* 11-12-1-404-466 – BMW M Power valve cover

* 13-54-1-740-160 – Fuel line cover

This really didn’t bring any power to the car but it sure looks more beautiful.

Cleaning the Conforti Air Intake System

I’m a big fan of the Conforti Air Intake System, since installation the unit has not given me any trouble and has offered great performance (plus it sounds good). But the time had come to clean the filter. Thankfully cleaning this air intake is nowhere near as involved as cleaning the dinan air intake.

I simply unscrewed the bracket around the filter and then gave the filter a light tug. Once removed, I beat the dust off the filter with my hand then used water to flush it clean. I let it sit awhile to dry, then sprayed some more of that dust catching spray that came with the Conforti kit on the filter and reinstalled it. Later I was informed that soap and water is the recommended cleaning method.

While the filter was drying I looked at the area under the filer, there was a lot of sand and debris in there so I used a shop vac to clean up the area. Once everything was back together I went for a drive to see how much more power I could feel…. couldn’t tell a bit of difference, oh well cleaner is better anyway.

2.8 SuperTrapp Exhaust

Subject: Muffler system upgrade for a 2000 2.8 Z3 Roadster
Cost: $150 for the exhaust plus installation (approx $75), I just checked the website and the price increased to $160.
Good: Customizable sound & performance, low cost AND lightweight
Bad: Non-that I am aware of at this time.

Why do this: As the immortal Tim Allen said “MORE POWER”. One of the first things I did to get more power out of my 2.8 was to Fogg the cold air intake (CAI). Even though Shawn never did a 2000 2.8, I took his ideas and suggestions from both his instruction on the 1.9 and from communications with the immortal himself and I was able to modify my CAI to work similar to his.

Of course this was not enough. So the hunt was on for a more affordable power upgrades. So I started looking into exhaust system replacements. I looked at every type possible, even asking about replacing the exhaust manifold and/or catalytic converter, not without screwing up my emissions & computer. So I concentrated my search to muffler replacement only. I looked at Bola, Dinan, Supersprint, etc. I searched for all types of information (horsepower increase, cost, material type, etc.) that would help me decide what muffler to purchase. I read all the articles from the MZ3 website on exhaust/muffler systems.

To my surprise, I found that all the stainless steel mufflers’ costs were in excess of $300 to $600!!!! Not including installation. Plus I was not convinced that the performance versus cost ratio was worth the money spent. I then remembered about the SuperTrapp system. They were primary an aftermarket motorcycle muffler. But, I saw them on cars in the past, about the late 70s. Plus I knew that they made systems that were stainless steel and lightweight. So the hunt was on.

First: I found their limited website http://www.supertrapp.com/default/atv_splash.htm not a great site to see what was available. But it did explain on how their system works.

Second: I found a supplier (there were not many in my area): http://www.racesearch.com, Part number: 543-2519, http://www.racesearch.com/CGI/mhp?mode=sbpn&pn=543-2519

Third: I found the one I wanted Stainless steel 5″, now granted if you called SuperTrapp & view the Z3 Coupe message board, they recommend that I use a 4″ system for horsepower up to 250 Hp. The 5″ system is rated up to 400 Hp. The reasons for the 5″ is simple with the wider inner diameter, the exhaust gasses would flow easier, less noisy and the 5″ outer diameter fills the factory muffler exhaust cutout nicer.

Arrow points to the location where the stock exhaust tube was cutWhen I had my muffler installed I had the installer hack off the original muffler and it’s supply piping back to the rear axle. If you look at the picture, you will see that the bend to the muffler has been reduced. He then made some custom hangers to hang the muffler at the stock points. Due to the heat generated from the exhaust gasses and the many discussions on the message board on melted bumper fascias due to the muffler. I instructed the installer to have the muffler hang a little lower and poke out more than normal. Giving it less of a chance of the muffler from melting the bumper fascia.

What is with the metal disks and cover???? The SuperTrapp muffler is basically a “glass pack”, where you have an inner tube that has holes and an outer tube that has insulation between the two tubes. Since there is no bends or baffles within the muffler, the gasses are unrestricted to flow toward the end of the pipe. Now the glass pack system has been around for a long time, if you had a hotrod or muscle car, you will know what I mean. Now for the metal disks and cover. The disks that you see on the side of the muffler are really spacers that have been stamped to allow the exhaust gasses to pass between two spacers. The metal cap is to help tune the performance of the muffler and car. Now the easiest way to explain this is to imagine that you have a large bucket with some holes in it. Now fill the bucket up with water, you will see that the water takes a long time to empty out. Now add more holes to the bucket and add water, you will now see that the water will empty out quicker than before. So the more holes you add the faster the water exits. Now there is more to the SuperTrapp system, which deals with vanturies that help pull the exhaust gases from the car. View the SuperTrapp website for more information.

Basically this is how this works with the car: The less spacers you install on the muffler, will produce more backpressure on to the system. Thus, increasing your torque, decreasing overall horsepower and a more quiet sound. With (6) spacers, the noise was a similar to my stock system. The more spacers you install on the muffler, it will reduce backpressure. Thus, decreasing your torque, increasing overall horsepower and a more robust sound. I ran both (12), (18) & (24-max) spacers. I normally run (24) spacers as a daily driver. Which is has a nice growl during idle and a cool roar during hard acceleration plus, I have had no complaints from my neighbors. I did try the system with NO spacers and it was too loud for normal driving.

I have raced my new exhaust with only (12) and no spacers, only to find that no spacers worked best. I will try my (24) spacer setup to see how it fares. Since the installation, I have not conducted a horsepower comparison, my fault. It will be hard to see if my new muffler has done anything, because I have done a ton of things to get this car quicker than stock. Check out my website for details: http://www.z3power.net

Summery: I am happy with the purchase of this muffler and I would do it again. In addition, if I did not have any performance gains in torque or horsepower, I have reduced the overall weight of the car. Which is always a good thing for our heavy cars.

Dinan ///M Air Intake

The ///M engine can benefit from additional air (mass) intake, however the Dinan design (specifically for the M roadster and M coupe) concerns me. Look at the picture below, the air filter is exposed in the lower air intake (front bumper). While this may provide additional performance I really question the long term effects. The K&N filter is rather durable, but what happens when it gets wet. I’ve heard a report of a check engine light coming on after a car wash. I also look at the amount of rock chips this section of my bumper has picked up and wonder how long a paper filter could last against this kind of impact abuse.

For these reasons I would not recommend the Dinan intake unless it was only for Autocrossing or Track use, even under those circumstances I question if the Dinan design has any advantage over the ECIS or Jim C design.

Update: I have been informed “Dinan is now shipping (for free) filter covers, a la K&N condoms, which are supposed to solve these issues”. I think this shows great customer service and reminds everyone why Dinan is such a popular company to do business with.

Dinan ///M Exhaust

Ultimate Fix for Chasis Flex

What’s the Ultimate Fix for Chasis Flex?

Having the chasis welded by rabid English structural engineers

The rear cross member is made of folded metal. Chasis flex is what happens when this member is under heavy loads. The fix is to have Peter at Crayford Coachworks, in Marina Del Rey (310-577-9830) with years of experience reinforcing the Porsche GT2 race cars, go wild. They choose to seam and stich weld a new member into place that had been reinforced with steel tubes. They also seam and stich welded other areas of the frame. The frame of most cars such as BMW, Porsche and Mercedes have little spot welds when they come from the factory. These little welds do not last if you drive your vehicle hard and have a large object hit the underside of your vehicle.

Why I choose to fix my frame

If you find that you have to have the rear lower suspension replaced, you might as well take advantage of the opportunity and have them seam/stich weld the frame. They can also reinforce the rear cross members. I had a large object hit the underside of my vehicle. The Frame had cracks that started from hairline cracks into what you see to the right.

The strongest M Roadster Frame in the World!

Not happy with the way BMW attached the differential, they decided to reinforce that as well. Now I am ready to add the MechTech Turbo Charger!

AC Schnitzer V8 Roadster

Click on Pictures for Larger Image

AC Schnitzer BMW M Coupe RS

Click on Pictures for Larger Image

I have been told that this coupe is one of 2 that was built by AC Schnitzer. One was built as an demonstrator and this one that was made for a custumer. The car is cosmos black and has black and red leather interior. The car is equiped with the following parts…

* RS height adjustable suspension front and rear

* RS brakes front and rear, 333 mm front disk internaly ventilated, with floating brake calipper and 328 rear disk internaly ventilated. 200 kph – 0 kph in 5,2 sec (app 140 meters)

* RS exhaust 2 x twin

* Removal of the toppspeed limit

* Front spoiler*

* Rear spoiler*

* Specially made Seats, reduce the weight of the car by app 50 kg

* Navigation system

* Velocity High End sound system.

* Short Shift system

* BBS Le Mans wheels 8,5 ET 30mm – 10 ET 23mm x18″

* Continental Sport Contact N1,225/40-18 and 285/30-18. This is a special tire developed for the Porsche 996 GT3 and has an extremly soft rubber mix

* The engine is stock but was build with the use of handpicked parts that are individually picked to fit 100% together

* Spoilers reduce the lift in the car form app 35 kg in the front and 55 kg in the rear to 0 kg front and rear at 200 kph

The former owner drove the Nurdburgring in Germany on 8 min,14. That is fast. They also tested this car on the Hockenheim ring and timed it to 1,15,38 sec. To compare the Ferrari 360 Modena use 1,17,09, Porsche 996 GT3 use 1,15,08 and the Viper GTS (Euro) with 384 HP use 1,16,34 sec.

ref: Auto Motor und Sport no: 23 3 November 1999.