Sidewall height will affect traction significantly. While switching to a shorter tire will increase effective gear ratio, if the tire spins, you will slow down. I would stay with the 27's or get a 28, you will be able to launch at a higher rpm, therefore lower you 60ft time, and your ET. the idea here is to allow the sidewall to "wrap" more when you launch, which allows you to hit the tire harder without it breaking loose. Do you have a dyno read out, you should be shifting 2-300 rpm past peak HP. Get yourself a shift lite and program it to come on at peak HP, by the time you react to the lite, you will be at the desired RPM, the motor will fall back to below peak, and you will runup to the next gear quicker. If you short shift, it will fall too far below peak power and take a longer time to recover. Also, taller tires will generally allow you to run a higher tire pressure, which will give you a more stable run at the top end. Idea here is to launch as close to peak torque, and run the motor to peak power.
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