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John, what gears would I need to get the 6:1 ratio for the quick change?

thanks for the help. the tires I am running are 5 3/4 in across. this is my first 1/4 scale car so trying to get it to be fast as cheap as I can without to much custom mods. so would the clutch spring be my best bet for a good launch. I don't really care about top speed as much as the launch.

The strip is 1/10 scale and my car has a zenoah motor. Not sure bow to tell which one, can't find any numbers on it.

how do i find out the terminal engine rpms?

I bought a raco gn to race at a local dragstrip. I am looking to gear it to get better acceleration, it came with 18/30 gears. What gearing would be good for drag racing and where can I get gears to fit the quick change rear?