[Infern0]

Originally Posted by Norm Peterson

I hope that any answer we get includes the definition of "wheel slip" that GM/Chevy is using.

Zach - read on.



Tire grip is hardly a 100% fully stuck down or 100% sliding/wheelspinning. It may help to consider wheel spin as the forward/backward counterpart to slip angle when cornering. As long as there is a load on the tires causing acceleration (or braking), the tires are not rotating in perfect sync with the road speed. And just like slip angles that have an angle corresponding to peak grip, forward/backward tire slip also has a peak slip% value (above which it rapidly gets easier to put them into full-blown spinning or even a smoke show).

Nothing about tire performance is "linear", let alone "constant". All or nothing behavior is for doorbell switches.

You'd really like to be able to stay right at that peak the whole time you're accelerating but doing so is probably beyond human capability. If anything, your feedback loop from sensing a little too much slip and lifting ever so gently - or not sensing enough and adding a little throttle - is simply too slow.


You and me both.

But I do want to understand what's going on behind the curtain even if all that does is confirm or deny my own suspicions and maybe point me in some direction for how to best cope with it. I'm not going to assume that this particular piece of technology will remain exclusive to the ZL1 and cars of similar performance capability.


Norm

Well said.