Excellent advice, Mister Wulff....
I wish I had a dollar for every noob that we tried to explain that BMWs don`t make good drag racers....you need a solid axle with big, beefy ring & pinion, axles, U-joints, etc. to stand up to a lot of abuse.....
Most of them don`t grasp the concept of "torque multiplication", and it`s effect on driveline components. Using the ZHP as an example, you have baseline engine torque of 222 ft./lbs., a first gear ratio of 4.35, and a rear diff ratio of 3.07.
So, if you do the math (222 x 4.35 x 3.07), you`ll see that you have a first-gear torque net of 2938 ft./lbs. (!) Not exactly inconsequential when you think of adding that figure to the kinetic energy generated by the heavy DMF flywheel & clutch combo spinning at 4 grand, or whatever RPM you decide to launch from.
If you can extrapolate a visual image out of all this, you`ll see that there`s a lot of potential for the sh!t to hit the proverbial fan. On a fairly hard launch (i.e., around 4,000 RPMs), one of three things HAS to happen....#1: Wheelspin (the desired effect, a "best-case scenario), #2: Clutch slips like a mofo, accompanied by an unforgettable smell (not good), and #3: a loud BANG !, accompanied by crunching, scraping, and lack of forward movement (the dreaded "worst-case scenario").
So, noobs and the uninformed....save yourselves a few headaches, and listen to the guys who have broken a bunch of parts in their travels.... :angel: