XXX-4 diffs, butter?
 

http://i28.photobucket.com/albums/c2...8062007086.jpg


Right, I replaced the above pulley, and the exact same thing has happened. Why? Do I really have too much power (mamba on 10 cells)? I can't believe that, I've run the same setup in cheap Tamiyas with no problems :confused:

Is there any other possible cause? Belt too tight? I don't know, so any well educated suggestions would be welcomed.

Thanks in advance

seems to happen if you a fan off doing doughnuts (wheel spinning in circles)
and 10 cells and a mamba OMG it must be like a hotrod

Thanks for the quick reply, nearly as quick as the car was (when it was running :p)!

So is this a common problem? I didn't actually doughnut at all, but it span out a few times, and did a few burnouts :cool: Not many though...

we can do it on the xx4 in seconds if we start doing doughnuts

:( That's really what I didn't want to hear!
So what I am experiencing is normal?

oops, sorry.
post deleted (wrong thread!)

I never broke one in my xxx4 or xx4 using up to 8 wind motors, i think it's just the power your putting through it.

just use 6 cells.. maybe even 7

I bought the XXX4 because I thought my Mad Bull couldn't take it (fixed gearing, so tbh it was more the motor that couldn't take it, the car didn't break once).

So spending money on a new car to find out I'm going to have to slow down is a no no :D

From what has been said by Southwell and others, the stock diff can't take it. So the solution is going to have to be 'make or find a diff that CAN take the power'...


Wish me luck :rolleyes:

if you are not intetested in racing fit a spool front and spool rear. either that or CRANK up your diff mega tight.

it only melts from diffing out a lot and heating the balls up.

Well I had the rear very tight anyway, but not locked. I might give that a go, but I'm running out of pulleys :(

I've only seen front spools so far, will they fit in the rear? Thanks

yes as the front is the same as the rear. just make sure the number of teeth on the pulley are the same.

I thought you could use different tooth pulleys for overdrive/underdrive. Though I'll stick to 41's for now.

Right, I've decided to just rebuild the stock diff, but tighten it LOTS :D
If that doesn't work, I'll start finding an alternative solution.

Anyway, before I give it a go, can anyone tell me how many teeth the orange spur gear has, and how many the white one has? I'm currently running something like a 23t pinion, but I'll stick a 15t on and see how that goes.

Thanks in advance,
Alexi