XRAY - Model racing cars

what part of pinion are you breaking shaft or gear? & at what point of the track is it breaking ie after a jump are you landing when on the gas.The 28 should not really do this although i personnaly feel it over powers truggy & so run an OS speed 21 mself.


Bren

Curt,

Also are you running the stock composite braces? If so I have found going to the aluminum rear brace helps the chasis flex less.

I too have seen other people running .28 engines in their trucks but I personaly don't see a need for them as I do think they put to much stress on the drive train.

Also you may try the two piece motor mount if you don't have one. I still have yet to break a pinion and I think its due to the rear aluminum brace and two piece motor mount.

Not really doing anything ridiculous when it happens, in fact I can't even really pen point an exact time. Just all at once the truck will only be in front wheel drive and the rear pinion shaft is toast. It's right where it goes through the bearing where it brakes. I'm running composite braces, but had the Hobby Shop order the metal ones along with, yet another, new pinion. I agree the 28 is a bit much, but it's what came in the buggy when I bought it used. It's a beast. How would the two piece motor mount help? The good thing is, it never brakes on race days, it's always 1/2 a tank into practice.

the two piece mount also acts as a brace mid chassis.

Cool, I'll have to try that. The thing that bugs me is, wouldn't the entire rear dif dip at the same time? I just don't get why the pinion shaft is braking. Grrrr. Well, I'll try the metal braces, hopefully, it will work. I'm pretty easy with the trigger finger so, I don't think the power from the 28 is the problem.