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With all due respect to Earl, not sure this is a helpful thread. 100 lbs means so many different things to lap times depending on car, track, driver, hp, tq., temp, tires, etc.
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That's too true Jeff. I bolted on 60lbs and got faster :o The hard top added 60 lbs to the rear and high up but greatly reduced drag that my top end was just so much better that it more than made up for the weight to accelerate, and with larger sway bars and urethane bushings in the sub-frame and trailing arms and proper toe in on the rear and it was much better, untill I swapped ends and went round. All because I couldn't keep up with a 400+ hp Firebird :bash_1_: