Originally Posted by 46Tbird
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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This.
Taking air out of a street tire is not to make the compound work better, but to let the tire have more give.
All I know is, every time i've gone to the track on street tires, i get better 60 foots with the tires around 24-25 psi compared to 35psi
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2009 Mustang GT 5spd - JLT cai, pypes l/t, o/r x-pipe, SW Retro 3" a/b, FRPP shifter, FRPP k springs, FRPP sway bars, FRPP struts/dampners, FRPP strut tower brace, 4.10 gears, and fancy FRPP valve covers 
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