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Old 07-24-2012, 08:21 AM
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1mrdad
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Originally Posted by nitrous36
Im going to be running 17.5 blinky(no boost/no timing). After building the kit and looking at the gearing chart(in the book), it was clear this car was intended for modified motors. And after reading the gear chart its clear I cant and want be using the 87t spur that came in the kit with a 175.5 motor.

I searched online, read the charts and did the math. I cant believe the 17.5(w/timing) needs a gearing so high. So now Im debating if I should get a 72, 75, or 77 spur. That would allow me to gear the motor for 3.5-4.0
On a smooth paved 220x125 asphalt race track in 17.5 blinky class, I have my FDR at 3.19 (64pitch gears). That's with a Revtech 17.5 (12.5 HT rotor), timing on the motor 1 mark before max, high speed fan, temps in the lower 140* on 95* day.
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