Gearing for Brushless Revo/E-maxx 9XL

[jhautz]

Just wondering if anyone has any experience with running a Feigao 9XL in an e-maxx or brushless revo using an e-maxx transmision. (Diff gearing is the same for revo and emaxx) I just got a 9XL and a Quark 125MonsterPro ESC and I'm looking for advice eon gearing. The only spur options I have are 66T and 70T. (I'm using the robinson racing slipper).

I am planning on starting with a 24T pinion and testing it out. That should be pretty conservative. I also have a 26T. Do you think going a high as 29 would be to much? I plan on running in second gear most of the time.

BTW I'm using 5S Lipo for the batteries.

[Mike.L]

your going to probably want a strobe setup/51T(spure) it many vary on what you want. Are you aiming for run time or speed?

[coolhandcountry]

I have a few questions. What tires you running?
If you running close to stock tire the 24 66 should be ok.

[jhautz]

I'm running proline bowties or Losi Zombie Maxx tires. Both are pretty close to stock size.

As for what I'm loking for, I have 8000mah 5cell lipo setup that I am going to be running. I want something that I will be able to run for a full charge and not overheat. Id rather be a little safe than agressive, at least at first. If the initial setup works out ok I may rty stepping up the gearing to maximuze the speed, but I want to start on the safer end.

I thought that the 66/24 gearing would be ok as well from what I have read in the forums here. The main reason I asked is cuz theres not much gearing info for a 66t spur. Like you guys said most are running the strobe 51t.

So do you think the 66/24 would be ok?

[jhautz]

51/18 = 2.83 ratio
51/20 = 2.55 ratio

66/24 = 2.75 ratio
66/26 = 2.53 ratio

From what I have read on the forums here 51/18 or 51/20 seems to be the setup most are running w/ the 9xl. So I figured that if I matched the ratio on the 66T spurr I should get similar results. The 66/24 ratio seems to be right in the middle and the 66/26 is on the more agressive end.

I think that this logic works right?

[coolhandcountry]

9xl for me with 1/8 buggy diffs which gear me down more. I don't run the gearing you plan to run. If you want it more relible and longer running with less heat I would go little farther down than what you have. A 20 66 would work alot better. I was thinking you going for a speed run. You can try it but watch temps on motor.

[jhautz]

I have a 14T, 16T, 18T, and 20T as well. If you think that 24 is high to begin with, I'll start with the 20T and see how that runs first.

[squeeforever]

22/66 is what I would go for.

[jhautz]

I Have a 20 and a 24 so I'll start with those. I'll get a 22 if it looks like that is the right one.

[coolhandcountry]

Start with the 20 and go from there. That away you can get a estimate on speed and power along with some motor temps.

I run 51/16 with my 9XL, seems a tad undergeared. 20 or 18 depending on if you want that bit more acceleration or top speed.