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YES! (more) (archive)

[ Follow Ups ] [ E30 M3 Message Board ] [ Msg. Board FAQ ]

Posted by Stan on October 26, 2001 at 07:13:59:

In Reply to: Just.... posted by kraig on October 25, 2001 at 14:53:18:

>>What the acura owners do is they want to start at a roll, DON'T LET THEM TALK YA INTO IT, they will hook up way to soon and you'll be in the exhaust fumes really fast.<<

That's right, they even post about that strategy all the time in their message boards. If they wanna go on the roll, slow 'em down below the speed they first suggest or achieve on the road and you'll get an instant car length (magic!!)when you go for it. Cuz by comparison, the S14 is a high torque motor with a wider power band. Too bad our gearing is not optimal - too wide for the best results.

>> My advice to to blow him away off the line, don't get your rpm's up to high in fist, shift into 2nd, then let it fly. Good luck, and make all us e30 owners proud!<<

With an AFM and the usual BPU mods in place it looks to me like the optimal shift point from 1-2 is as high as possible. That would be just before the limiter kicks in, 7800 RPM for a JC chipped car. If you ditch the AFM, you can shift at around 7500 RPM without penalty. Cuz the powerband is so much wider. I measured the actual g-forces in different gears versus road speed and RPM. On my no AFM car they cross at around 74-7500 RPM for 1-2 with no AFM. Pretty forgiving actually. The idea is to accelerate the hardest in whatever way you can. As you rev the car in a particular gear past the peak power RPM the accleration slows. But the gearing continues to multiply the torque. So you have to balance the disadvantage of the dropping HP past the peak versus the advantage of retaining the torque multiplication of a given gear compared to the next one a little longer.

You should also practice launches. In my case 2500 RPM works well. The idea is to avoid a bog or excess wheel spin. A chirp and some spin which quickly decreases seems best if you can avoid bogging.

Stan


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