emaxx3905 gearing

[jediguru]

I am trying to figure out the best gearing for my emaxx. I have a 10XL motor running on 5S through a MM. I'd like to reach 40mph. I did the calc and I came up with something around a 54/24. Is this pinion too tall. Should I go with a 22 or 20? I just want to be able to keep my temps in check also. 5mm pinions are a bit expensive and not easy to get so I'm trying to make a good decision.

[sleebus.jones]

54T spur? That seems like a weird number to me, and I'm not sure that your pinion would reach it, because of the smaller diameter of the spur. I use a 66/20, which is pretty darn fast. 22T would take me to 40 mph.

Sleeb

[sikeston34m]

What KV is the 10xl?

[jediguru]

1600 kv approx

[jediguru]

what kind of setup are you running on your emaxx, sleebus? Motor, esc, voltage, etc.

[jediguru]

on paper you should be doing more like 30 to 35 mph with that gearing, assuming a similar setup.

[sleebus.jones]

I'm running a 10XL on 5S. Was running a BK 9920, but the smoke got out of it. Probably will throw the MM on it this weekend with some punch contol, etc. I'm using a RRP 66T slipper, and that's worked great for me. Honestly, I haven't even put the 22T pinion on there. The 20T is fast, and I think a wreck while running the 22T would be messy. :)

However, I'm gonna have to give it a try in a open parking lot. The temptation is just too great, haha.

The 22T is closer to 38 mph, but figuring tire balooning, it's prolly close to 40. I'm using 3.7v/cell, which when using a fully charged pack is even lower than the voltage drop I've logged. All I know is that on concrete, I've yet to wind it all the way out with the 20T, mainly because I don't want to slag my ride.

Sleeb

[neweuser]

The kv on the 10xl is I believe 1502. loaded, on 5s should bring to you high 30's with a 20T on a 51 spur mod 1. not sure about 32p