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It tells a computer not to (automatically) apply the rear brakes even if it detects that the wheels are losing traction.

Benefits: You can intentionally (assuming you have enough engine power available) spin the rear wheels to do "fishtails", "power slides" and other fun stuff.

Downsides: You could lose control of the car in a situation where traction control would have "saved you".
 

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if the implementation is as it were when it was on the Supra TT, TRAC also retards timing when it detects slip (also closes off the TB). It was fairly evident during quick sweepers with it engage (sort of like permanent turbo lag). I haven't really looked at the TB of the IS close enough to see it this is the case.

Originally posted by TEG:
It tells a computer not to (automatically) apply the rear brakes even if it detects that the wheels are losing traction.

Benefits: You can intentionally (assuming you have enough engine power available) spin the rear wheels to do "fishtails", "power slides" and other fun stuff.

Downsides: You could lose control of the car in a situation where traction control would have "saved you".
 
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