J-Madd Posted May 2, 2013 Report Share Posted May 2, 2013 Slow brings up a good point, in which I mispoke/wasn't clear in my original post. You want to hit the traps at peak HP RPM, not peak RPM. Motor A may make peak HP at 9700 but rev to 11K...you want to be at the peak HP through the traps...after peak HP RPM, you're slowing down. I ALWAYS gear mine like that(for sand anyway). Peak HP rpm is key. I calculate mine, and they run almost the exact calculated MPH if i know that RPM. You might handle some overev with asphalt and especially with a custom ignition curve. I have a 10 mil Cub with straight cuts and 1 without. The one without is faster (not because of the gears, it's just a better motor). Quote Link to comment Share on other sites More sharing options...
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