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Old 09/01/2014, 02:12 PM   #2
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Location: Brisbane Australia
Joined: Jan 06
Posts: 1,886

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The original specs were done with bias ply tires in mind. Altering the settings for radials is a common tweak that results in improvements as you note...

In general, more caster applies more centering force to keep the wheels tracking true... negative camber also helps maintain true tracking (dependent on suspension and chassis alignment, but that gets pretty complicated to really determine) and reduces body roll.

An interesting write up on the three aspects of an alignment here:
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