Gearing Setup Problems

[antonyb123]

Hi Guys

I am running a xray T1 with 17.5 HPI Flux Brushless motor.
I am finding that the guys I am racing with all manage to out do me when it comes to accelerating out of the corners, top end speed is fine. I am aware that reducing the pinion size will decrease the top end speed, but as I am currently only racing on a small track this is not a big issue
I am currently using a 88 spur gear, and a 24 pinion.
I exchanged the 24 pinion for a 19, but after I put it in and tried moving the belt the hole drive system was tight, to the point it felt like the belt would snap if I tried forcing it to move. So I tried a different pinion, 22, this worked to an extent. But it sounded like a bag of spanners when I was driving it and is by far no where near as smooth as when I was running the 24.
What am I doing wrong or have I got the gearing all wrong?
Or perhaps I am missing the basics points to gearing?

Any help would be appreciated
Cheers People
Antony

[BazzerH]

Sounds like you messed up the meshing between the pinion and spur. Make sure it's not tight and also not too loose as well. Should be a little bit of waggle room between the gears but if in doubt ask someone to check for you after changing pinions. The guys at your club might have more punch programmed than you, or maybe higher mechanical timing with a smaller pinion. Could also be they're using better motors or even just carrying extra corner exit speed compared to you, thats half the battle in 17.5 racing

[antonyb123]

thanks for that, im pretty sure it wasnt that tight together, but i will try again and see what happens

[Robbiejuk]

You have got the right pitch of spur gear and pinion? Just wondering if you have a 66 dpi spur and a 48 dpi pinion?

I know my friend had the same thing because he had brought some tamiya pinions which were a different pitch to the spur gear.