Pinion Size

[J-Lo]

Hi

I have an Schumacher Mi1 with a 13.5t brushless setup with the stock 86t spur fitted. I am intending to race it around an indoor tight track (carpet) and have no ides which pinion(s) would be best suited. I would be grateful for any advice.

I have noticed that there are different 'DP's what does this mean??

Thanks.

J-lo

[sosidge]

*rant mode on* Gearing a brushless motor has become insanely complicated due to the over-complicated timing adjustments on the ESC and motors. Blinky software and fixed motor timing is the only way that on-road will get out of the hole it is digging for itself *rant mode off*

Tell us what motor and esc you are using (as well as the software and motor timing settings) and we might, possibly be able to give you a gear ratio.

DP is the pitch of the gear (size of the teeth), naturally only gears of the same pitch will mesh together, so if you have a 48dp spur (likely, judging by the size), you need 48dp pinions to mesh with it.

[J-Lo]

Hi, Thanks for the reply.
It will most probably be the Fusion Exceed 13.5 combo. I am not going to be getting into motor timings etc (seems too complicated).I also have a Hobbyking 60a sensored/sensorless ESC and a Hobbyking X-Car 13.5t sensored motor.
I am not sure which one to install.

Thanks.

J-Lo

[sosidge]

The equipment you mention is not common racing gear and I can't offer very firm advice. Perhaps someone else has more experience with them.

What I can say is that racing-spec 13.5 system with "blinky" zero timing software and a zero-timed motor should be safe to gear at 5:1 overall on a big track and 6:1 overall on a small track. Adjust from there.

[J-Lo]

Thanks for the advice. I have something to go on with now...
It's a small tight track, so will start with the 6:1 ratio.
Thanks again

[Mad-Wolfie]

personally for tight tracks i would opt for a ratio of around 7-or-low 8's (smaller pinion) rather than 6;1 to give you better acceleration. 6 would suit outdoor tracks better & if you run a bigger pinion you are gearing for top speed more than acceleration so the motor will be working harder & get very hot (which causes damage to the motor & can affect performance) or even themal out your ESC. A lot of people are actually making gearing changes based on motor temperature, hence why this is one of the reasons you often see people using temp sensors straight after a run & pointing them at the motor.

The golden rule is you want to try to reach top speed before the end of the straight just before you need to back off or hit the brakes & the motor should not be so hot that when you touch it you end up burning your fingers & you can actually hold your hand on it.