Diff bet 13 & 15 tooth pinion gear w/ 42 spur gear

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Roger A. Cucal Jr.

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hi guys, i need help from experience driver out there.
I have 13 & 15 tooth pinion gear which I want to match w/ 42 tooth spur gear, engine to be use is Novarossi P5XLT & novarossi Clio P5 and will be using efra 9901 & 21 short manifold. Now, the question is which of these two pinion gear should I used in a bit compressed track having few normal jumps, is it the 13 or the 15 tooth pinion gear? w/c one is for top end & w/c is for bottom end?
thanks in advance guys.... -Alex
 

Greywolf74

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Id start out with the 15 and if you think you need more acceleration coming out of turns then switch to the 13. However the difference between a 13 and 15 is minimal. probably wont see a lot of difference but it will be bit noticeable.
 

ninnon

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Like Rolex said, the bigger the PINION gear (smaller gear) the less revolutions it has to make to turn the SPUR gear, thus a higher top speed and less torque. Whereas if you have a SMALLER PINION gear, and a larger SPUR gear, you will have a lower top speed but much more torque- for example, rock crawlers have a SMALLER PINION gear, and a larger SPUR gear, they don't go very fast, but they can go anywhere. If your still stuck here's a page on the forum that'll help:

https://www.rcnitrotalk.com/gear-ratio-basics/

As for your situation, I'd try out both and see which one you like the most :)
 
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