Quote:
Originally posted by starscream
What is your gear ratio?
I ran my MBX-5 with a 13T pinion and a 46T spur and fried my controller in 10 minutes. This gear ratio is way too high. I temped my controller at over 200 degrees F. I fried two FETs and who knows what else. The motor was also damaged in the experiment. Luckily it didn't cost that much to repair...
I am setting up my MBX-5 with a gear ratio closer to a monster truck. I'm going to start really low and work my way up.
My first try will be a 13T pinion and a 65T spur.
Hope this helps.
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Thanks, starscream. I remember your post from earlier about frying the controller, which is why I check the temps so often. So far I have not had a temp above 155, so I don't think I'm getting into the problem you had.
I do have 15/46 gearing, though. I've had this gearing right from the get-go and I'm just working on Mike's advice on getting the right brushless equipment to work with my project. So far there haven't been any thermals, just the weird brake issue.
I did buy an OFNA comp diff and the plastic spur for it. The spur is 51T, so once I get it all to fit my buggy I'll have more and better grearing options. It's going to involve moving the diff more to the center of the chassis and drilling new holes, but it shouldn't be too tough to get done.