Largest pinion possible with RCM Xray 808 mount? - RC-Monster Forums

SidewaysLS4 · **Largest pinion possible with RCM Xray 808 mount? -** 12.31.2008, 08:35 PM

I have this idea for an 808 based speed machine, but with the low geared diffs and my smaller tire spec (Belted OFNA or Ipanema tires), I would need to speed up the drive train some with the stock gearing it would seem. Any ideas how big of a pinion will work before the RCM mount runs out of adjustment room assuming the stock or -1 tooth option spur?

jhautz · 03:18 PM

From what I know, Mike usually sets up the mount to work with a range of around 12 to 25 tooth pinions with the stock center gear size. He would have to chime in to be sure though. I havent tested mine wit all of the gear combos. You could go for the optional 41T center dif gear on the 808 and get room for 1 more tooth on the pinion also. Just mentioning to option.

Good luck with the speed project. Make sure you let us know how it goes. Always wondered how fast a sock buggy could be made to go. I got to 60 mph and stopped after that. It was fast enough for me. I saw Edumacated get his up to 68mph I think. It was flyin! (1512/1.5D on 5s Lipo)

SidewaysLS4 · 05:31 PM

Thanks for the input, I'll definately post something if this idea goes through. I figure a buggy should be really good for speed on any old road with the suspension travel, and since the XRay is getting stellar reviews and seems to be the lightest, it should be really, really good for this project. My current 1:10 speed buggy does a GPS'ed 63 so far, but tire issues slowed down the tinkering to push it more before winter hit. I decided to put some belted 1:8 on-road tires on it to keep the wheel speeds down (still completing the 17mm hex conversion, unsure if the big wheels will tear up the drivetrain). But then I got to thinking...why not go to 1:8 scale, thus this idea, as I need to go above 2S soon anyway, I might as well go 'big' lol.

Youre in Chicago too, eh? I'm a few miles E of Ohare.

auto2 · 01.01.2009, 10:30 PM

i had a 21 pinion on mine with 5s 1512 and mike was driving it and chasing the highway traffic with it using crimefighter tires . i think a 25 would fit.

jhautz · 01.02.2009, 11:24 AM

Quote:

Originally Posted by SidewaysLS4

Youre in Chicago too, eh? I'm a few miles E of Ohare.

I'm in the west loop. You ever go out to leisure hours? Or the kohls parking lot in elmhurst during the summer?

SidewaysLS4 · 01.02.2009, 08:03 PM

Neither. Just some runs in my alley (makes you want to build a car that goes straight) and the Elk Grove industrial parks for long speed testing along with a couple spots in Rosemont. Where's the Elmhurst place and what goes on there?

Work is sort of W Loop...Milwaukee and Erie.