From my testing I’ve noticed that there is a consistent hard limit in the engine simulation to cut torque once the skid magnitude of a driven wheel reaches 30 times the ground speed (Say you have a 28 diameter wheel, you’re pinned to 840 skid magnitude and it’ll PWM the drive torque to hold that limit, 32=960 etc, 30x is the constant factor). When the wheel is in the air theres no ground speed reference and it’ll compare with a ground speed of zero (not quite but more or less), this is why it feels like a soft limiter at around 3000rpm when the wheels aren’t touching the ground in first, barely over idle in 2nd and ofc this changes if you adjust gear ratios.
As far as I can tell it looks like there is traction control logic thats still active even when it’s switched off (or possibly something to do with the arcade stability control features) I think the flaw is isolated to the engine simulation and not a fundamental flaw in the physics/wheels system since you can vastly exceed the skid maginitude under braking/handbrake without ABS (and ofc the slip magnitude under heavy over/understeer is fine too)
Hopefully someone picks up this issue as it’s been in the engine for as long as I’ve been playing with chaos.