Typically what a manufacturer is doing with a tire pressure setup like that in
a stock vehicle is giving the vehicle more straight line stability. Remember
that most drivers confuse "stability" with "handling". Hence a car that is
very stable in a straight line is a "good handling car".
Now one of the things you are trying to achieve with higher front pressures is
a crisper turn in, in addition to helping to balance a typically front heavy
car. Those higher pressures in the front will make the car more responsive to
steering input. Very important in a low speed, relatively tight autocross
situation. Back in the day I actively campaigned my '88 Honda CRX in our SCCA
regional autocross series. Because of the very understeery nature of front
wheel drive I typically ran a 10 pound differential front to rear in autocross
mode. However when I took the same car to Mid Ohio to run Porsche Club or
Track Time schools I backed it down to around a 6 pound delta, because of the
much higher speeds involved on the track, and FWD's interesting little
characteristic of violent trailing throttle oversteer...
But that's another story...
Terry Stetler
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