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Tire Pressure for Better Handling Balance
Posted by Kenny Gong (more from Kenny Gong) on Mon, 4 Feb 2002 14:31:15
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

I drive aggressively around corners.  Could I adjust tire pressure for a
more neutral handling balance?  I know power oversteer is out, but love to
reduce front tire push.  Maybe a change of cornering style is required.  My
usual cornering technique is to brake before the corner, roll the car into
the corner without throttle or brake, then feed the throttle around the
apex.  So what I am after is more neutral handling for free.
The current footprints on my car are 205/60H15 Dunlop Sport A2 on front at
35psi and Firestone SH30 on back at 32psi.  The higher than factory
recommend pressure is to lessen tire rollover.  Suspension is factory 86
9000T.
Should I go the other way with higher rear pressure?  Higher pressure is
like stiffer springs, so higher pressure will give more roll stiffness like
a stiffer antiroll bar.  The reasoning: higher rear pressure means more rear
roll stiffness, which means less rear weight transfer, which means the rear
outside tire has less weight transfer than the front and thus less grip,
which means the outside rear tire more likely to slide, which means more
neutral handling.  Are my reasoning correct?
On the other hand, what about even higher pressure up front for some lift
throttle oversteer.  The reasoning: more weight transfer in the rear, thus
more rear weight rebound to the inside tire during lift throttle, thus
outside rear more likely slide.  Lift throttle oversteer is not what I what,
and I usually don't drive that way.  Anyway, what is the maximum safe tire
pressure for everyday use?

understeering
Kenny
86 9000T
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