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21.5 spec ratio suggestions

21.5 spec ratio suggestions

Old 05-03-2015, 07:07 PM
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Default 21.5 spec ratio suggestions

Looking for 21.5 suggestions. I run a spec GT class that has a 5.5 gear ratio rule. Currently running a Thunder power 21.5 with timing turned up past the marks. Have tried killshot 21.5t, and hacker Skalar. Drove a killshot RPM with 80 timing and it was significantly faster. Anyone have experience with the R1 or a d4 short stack with a rpm rotor?
Any other suggestions?
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