R/C Tech Forums - View Single Post - Performance difference between a 17.5 and a 13.5
Old 07-14-2017 | 09:18 AM
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LJH
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Default Performance difference between a 17.5 and a 13.5

Hello All,
While pretty well versed in brushless motors for E flight I am a newbie when it comes to BL motors in cars so looking for some guidance.

I have a TT02 that I am running with a old Novak Sport 17.5T motor and a Justock ESC. I have it geared with a FDR of 4.33:1 and it goes alright but being a motor head I wonder if it would be more fun if it was a bit faster. I do like the torque that I get with the 17.5 and I get an easy 15 minutes of duration out of a 4000mah pack.

If I was to switch to a 13.5T motor and gear it appropriately how much of a difference would there be in torque (acceleration) and top end over the 17.5? Any guesses on how much of a hit I would take in duration?

I am not racing, I drive the car 90% of the time on two tennis courts (70' straight?) and set up a little course with field markers. These tennis courts are not all that well used or maintained so the surface is not that sticky.

Thoughts?

Thanks.

Cheers,
Jim
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