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A car that steers from the front axle must understeer to initiate any turn. After that, whether it continues to do so or not depends on a number of factors. Every road car I've ever driven, including Porsche 911, understeer.
Traction control is to prevent wheelspin. It has nothing to do with keeping the car straight.
Stability control is intended to keep the car straight.
Neither one improves tire grip.
ABS has nothing to do with keeping the car straight either although it makes it very easy for the driver to do. EBD is intended to keep the car straight under braking. All modern ABS also has EBD. Older versions of ABS did not.
VSC is the same as stability control but the control parameters are extendeded to allow a little instability before stepping in.
Subaru's traction control and stability control systems are not very good. They step in far too early. 2017 versions are much improved.
Driving the BRZ as I would any other car results in the traction and stability control intervening. That's how I know they aren't very good.
With both switched off it is ridiculously easy to step the tail out on these cars, again comparing the BRZ to every other car I've ever driven, including some with 600+ horsepower.
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