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now its best pass is [email protected] turning 6,500 with a 28x13.5 et street going across the line. I ran across a nail at the track this weekend and so I ordered new tires but I did a 29x12 slick. is the 1 inch taller tire going to drop the rpm much. I would like it to be around 6,000
 

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now its best pass is [email protected] turning 6,500 with a 28x13.5 et street going across the line. I ran across a nail at the track this weekend and so I ordered new tires but I did a 29x12 slick. is the 1 inch taller tire going to drop the rpm much. I would like it to be around 6,000
Ratio of tire height change.

You had a 28 inch tire. Now you have a 29. The size ratio change is 28/29 = .9655

.9655 * 6500 = 6276 across the line if the speed is the same.
 

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You are also taking some gear out of the car by going bigger. Would not be surprised if your 60' suffers a bit, and therefore your ET. MPH might stay the same.
 
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