Quote:
Originally Posted by jmg
That is true on front biased AWD systems. Here is why:
Your tires can only do 1 thing 100%. So if you brake, and your tires are using 100% of it's grip to stop the car, it cannot change directions. That's why, if you don't have ABS, and you lock up the wheels, your steering inputs will not change the car's directions.
So, in a front biased AWD system, or most FWD cars, if you are using 100% of the tire's grip to turn the car, then apply throttle too soon, your tires will have to take some of that grip that it's using to turn, to use it to accelerate. That leaves less grip to turn and coupled with weight distribution to start shifting to the rear, leads to understeer.
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Sorry to nitpick, but that is not quite correct. Even rear biased AWD will induce on-power understeer. My wife's previous S4 had a fixed 40-60 front-rear torque split and still plowed under power. To be able to alleviate that trait, an AWD system needs to be able to completely decouple the front axle, which the G8X and 992 can do.