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With a 393W N/A, C4 /brake. I'm running a 26" tire w/ 4.10 gears, 10.18 @ 130 mph, in the 1/4, turning 7000 rpm. Thinking of going to a 28" tire, what's going to happan, is the car going to slow down with the 4.10 gears? What would be the best gear ratio to with?
 

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Going to a 28" tire will now give you the actual 4.10. What is the optimum shift point of the engine? Odds are you will gain about 4-500 rpm, making the car come through that much lower, as well as making the converter slip more and loosen up. If it wants to come through lower, then you will gain from it, if not, it will go slower. Need to set it up for trap rpm according to shift point.
 
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