Quote:
Originally Posted by Sport-Tech
Not to be pedantic, but the wheels don't really lock up--quite the opposite in fact. Consider the downshift sequence:
-------------------------------------------------pre-clutch shaft rpm --- post-clutch shaft rpm
1. 3rd gear engaged: ------------------------------- 3000 --------------- 3000
2. clutch in, shift to 2nd, no throttle change ------- 5000 --------------- 3000
Now when you let the clutch out quickly the engine will suddenly accelerate the driveshaft harshly since the pre-clutch (engine-side) shaft is spinning 2000 rpm faster than the post-clutch shaft, thus causing the rear wheels to lose a bit of traction as they are suddenly accelerated and so they chirp, they don't lock up. It's the same process (at a less dramatic level) that happens when you dump the clutch at 4000 rpm from a standing start and lay rubber.
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If you are going from 3000rpm in 3rd down to 2nd without reving the enigne up, you are slowing down the wheels, de-accelerating, aren't you? The engine wont suddenly accelerate unless you add more gas. If anything you are pretty much stalling a moving car (except the fact that it's moving means the engine will stay on). Only after this initial shock may the engine slightly increase in revolutions if the car is still travelling faster than 2nd gear at 3000rpm permits.
Also, if I remember correctly, this type of driving technique is called a Shift-Lock in drifting circles. Thus "locking" up the rear wheels wasn't too far off the mark as it tends to do just that.