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Originally Posted by 70Sixter
To correct for understeer you want to INCREASE front tire pressure and/or decrease rear tire pressure.
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Technically, this isn't correct.
Assuming all pressures are within +/- 5 or so psi of the level that the factory recommends, increasing pressure reduces grip, increasing slip at that tire. If the poster is experiencing understeer, there is insufficient grip at the front axle. This calls for a decrease in pressure at the front or an increase in pressure at the rear.
Check out this web page, specifically, the table near the end:
http://en.wikipedia.org/wiki/Car_handling