Quote:
Originally Posted by TomT/Williamsburg
You have to do the math - at 75 mph I am doing 2500 rpm. The flattie needs to run between 22-2800 rpm in 5th. There are formulas on line which when you plug in your tire size, rear gear ratio, 5th gear output and speed, you come up with an rpm. In my avatar when running 85 I am doing 2800 rpm - 32” tire, 3:54 rear gear, .86 5th gear, and 75 mph gives me rear right around 2500 rpm right where the flattie likes to be. Once you have figured this all out, you will enjoy the 5speed behind your flattie all the more.
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Good write-up, two big factors are tire size and the over-drive ratio. There are several OD gears for the T5. My OD ratio is .63, so it works with a lower rear axle ratio.