In Reply to: Durability of M3 drivertrain? posted by Marcus Frost on January 03, 2000 at 23:38:45:
i understand and so far have experienced that the tranny is bullet proof on the m3. i have had no problems so far and i have about 400 crank hp. the clutch is a different story. my stock one worked fine except on aggressive driving on shifts 3-4 and 4-5. 1st and 2nd would still spin tires, but on the higher shifts when speed shifting, rpms would rise without speed rising. i could tell it was slipping. i got the AA stage 2 clutch to replace the stock one and it holds! my 1/4 mile mph went up about 3-4mph and now 3rd gear spins the tires instead of the clutch. 4th and 5th grab instead of slipping.
the clutch is a must. as far as the rest of the drivetrain, i understand that the differential is a weak link. i havnt experienced failure as of yet, but i have heard that several other high hp people have gone through them. i would recommend the quaife (or something like that) unit since it offers a better lockup %age to get the power to the pavement through 2 wheels instead of 1. talk to karl and mike at AA and they can advise of how much the car can handle, theyv'e been working on bmw's for about 25 years and seem to know what theyr'e talking about.
95 alpine white turbom3 [email protected],street tires
: Does anyone have any estimates on how much HP an M3's drivetrain can handle reliably? I wonder how well it can handle something like an AA Stage IV that puts out 500+ hp. I would assume it can, but does anyone actually know what the drivetrain is rated at? Just curious.
: Also, at what point do you guys feel the stock clutch is no longer adequate for the power the car is putting out 350hp? More?
: Thanks again,
: Marcus Frost