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      12-10-2007, 05:27 AM   #33
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Drives: E92 335i coupe Black AUTO
Join Date: Apr 2007
Location: Alhambra, CA

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2007 335I SEDAN  [0.00]
Originally Posted by longodj View Post
Hey Guys,
So, at the last autocross I went to, a WRX STI demolished every BMW in its tracks. The STI is 3300 lbs. My brother has been eyeballing a Porsche Cayman S and will probably be getting one before next autocross season, and I'm trying to get him into autocross. The Cayman S is 3000 lbs. My roommate drives a Nissan 240sx. 2800lbs

Now, I drive a 6MT 335xi E90. 3800lbs. My brother has pretty much always beat me at everything (except anything technical but that's a whole nother story for a whole nother day), so I'm looking to drop some weight from my car.

Hopefully this thread will stand as a central place to find where to drop weight from our cars. I'm looking to drop at least 200 lbs while still "feeling" stock and being daily drivable....i.e. while keeping my girlfriend from killing me every time she gets in my car Maybe in a year or so I'll jump for nice racing seats reupholstered to match my Terra but that's a bit too deep for my pockets atm. So by daily drivable I mean keep all audio/nav components, A/C, etc.

I fully understand that this is sort of ridiculous so please do not flame me, if you don't have anything helpful to say relating to this issue please do not post. I also fully understand that our cars aren't necessarily designed to be light and aren't the greatest to start with if looking for light. I ALSO understand that weight isn't everything, but hell WHY NOT drop a few pounds right? I'm already on a diet

Here's what I have found so far, although I don't know of most of the exact weight savings numbers... I don't know if I will personally be able to get well....any of these before next season but if I can get an idea I might be able to scrap some together :-P

-Wheels/Non-RFT Tires (Unsprung): ~45lbs
-Lightweight Battery (Rear): ~30lbs
-CF Hood (Front): ~30lbs
-CF Boot (Rear): ~15lbs
-Exhaust (Center): ~10lbs
-Removing rear seats (Rear): ?? (for track days...)
-Replacing front seats (Front): not sure but I would venture to guess at least 100lbs.....aren't stock seats 100lbs+ each with all the automation goodies? good racing seats are <15lbs each.

Anyone know of any other permanentish mods that dump weight without damaging daily drivability? Preferably the mods would be in the front to dampen that 53/47 or so split we have going.

exhaust system without the cat at all will reduce you about 30 lbs. you might just want to add dp. intake. fmic. CF bumper. Disconnect all of your accessories on the car.. You see when you have all the package on the car. it use energy to turn it on. Horsepower is energy. Any accessories on the car will rob your hp away from you. for example. when your turn on your A/C During summer or heater during winter season. YOu are actually robbing your hp away from the engine to make it turn on so you can enjoy life. lol Each accessories will have OEM spec how much it will rob HP away from you.. What do you Lotus car only come with optional A/C... Duh it is so obvious they want this car to have less electronic stuff on it.. It Can travel fast.

one other thing i forgot to mention. Rule of thumb is When you are removing something to the front. you need to remove something in the rear also. SO the car have even distrubution wieght. so you wont flip your car on high speed ride. lol