Originally posted by ElectricConvert
I'm new to the Pro4 and I was wondering if someone could give me a quick run through tips and tricks for the diffs.
I've gone through 4 sets of gears in one race day (busted front and back) and it is frustrating to say the least.
I've shimmed it up at the expense of efficiency and it lasted through the finals but is there something I could do to minimise this from occuring?
It seems that the gears are very susceptible to bumps and nudges when racing.
I'm running a brushless setup equivalent to 8 turns brushed and have already installed a front one-way gear brace.
I asked the same question here and did not get much concrete information so I did some testing for myself. Here is what I found:
1. If you are hitting solid things, boards, concrete, with any sort of decently powerful motor (like your brushless) with a front oneway installed and you are still on power you will break a gear no matter what the shimming is or whether you have the 1.1 gears and plate. Even stock motors can easily damage the gear, but is much less likely too. Jumping into the air and landing on power also will break gears. The same is true of most shaft cars with a oneway.
2. If you change to a front diff the chances of breaking a diff is almost 0. I have never broken a diff with this setup.
3. Shimming it up ultra tight will help. Stock for the front is .3 on the short side and .2 on the long side. I use .6 on the short side and with the oneway break far fewer gears, however I still can chip them. My track has boards on the outside of fast corners and uses the road rail system. The boards will eat gears if you hit them under power, and the road rails launch you and if you land on power also you can break the gears. At .6mm I chipped two teeth the other week and crashed a whole bunch.