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Old 08-19-2013, 11:01 AM   #47
46Tbird
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Originally Posted by SlowGreyGT View Post
That won't help at all unless they are drag radials. The sidewalls on a regular street radial do not flex therefor do not benefit from lowering air pressure at all.
Most modern tires recommend 35-45psi for fuel economy and there is NO WAY you're going to be able to hook up on a rock hard 40-series tire with ~400hp and a stick. There is a difference between "take some air out" and "take it down to the air pressure you run in a slick." Most of these guys would get a better launch at ~25psi than they will at 40.

*edit, treed by junkie
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