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In Reply to: 1999 Z3 2.8 power updates posted by Dennis on November 05, 2000 at 21:21:57:
1st, get your car into a shop with a dyno, this way you know where you are starting. Keep in mind that a dyno test will only tell you what your torque and horsepower are to the rear wheel. Auto manufacturers tell you what the horsepower is to the flywheel or crank. You loose between 15-20% due to drive train and wheels.
You should know that BMW makes a pretty good car and your mods for 25 hp require you do all of the following:, throtle bodies, air intakes, free flowing exhaust, upgraded computer.
For more power you will need to increase displacement (bigger motor) or use some kind of forced induction like a turbo or supercharger. Companies like Dinan make supercharger systems that would run you about $15,000 installed and would give you about 400hp to the flywheel or $38,000 for a complete system with suspension, brakes, etc...
Mechtech makes a system that is very nice,
http://www.mechtech-ms.com/indexmagart.html , I have driven in one that was driven very hard, it was boosted with a turbo and ran about 300bhp & 325lbs torque to the flywheel and that is without upgrading the computer or airintake. It was very fast. TO see a flyer on the mechtech turbo Go to http://www.alsabery.com/mechtechturbo.jpg
I should tell you that the best upgrade that I have done is the suspension. I now have a smoother ride and my car does not squat when I accelerate or dive when I brake, I do a great deal of autocross and put on the event for the BMWCCA LA chapter. This must be the best bang for the buck. I went with H&R/ Bilstien sport setup.
2nd, go to http://www.mz3.net/performance.html, mz3.net is a great site and has dyno charts and upgrades for the 2.8. It has performance as well as a good number of other products. The combination of an exhaust upgrade, cold air intake and OBD II software should get you what you are looking for. Look around www.mz3.net for other goodies.
3rd, here are a list of sites that have performance upgrades:
www.dinanbmw.com
They have superchargers, throtle bodies etc. if you really want to have some serious HP. Click on products and then scroll down to Z3 then click on 2.8 Z3
www.hms-motorsport.com/
They have a good number of products for Z3 spend a little time and look around the site.
www.turnermotorsport.com/
Another great site, it has chips and stuff.
www.autothority.com
Be a little more patient and look at some of the sites a little harder, the stuff is out there.
Join the BMW Car Club of America, if you go to local chapter events you will meet other people with the same car and see what they have done. You should join just for the magazine it is worth it, last months had and article just on dinan supercharger products, it was for the M Roadster, but dinan can supercharge any of the Z3's.
Good luck
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