Sounds like the typical cogging you get with smaller brushless systems causing your climbing from a stop issue. Because they are sensorless the speed controller energizes the coils in the motor from a random starting point because it does not know the rotors position and that is what will cause cogging when speeds are very low and higher torque is needed.
Did you try a short, slow roll up to the obstacle? Perhaps lowering the gearing might help. I've gotten pinions as low as 8-tooth but haven't tried them yet to know if they work without mods.
Thank you, sir! That makes sense. If it's already rolling then yes, it will climb. Just no torque from a stand still.
I just got 2x sets of the TA Diff Kits delivered today to attach my Hot Racing steel outdrives to. I had the rear diff apart last week to try and locate the grinding in the drive train. The steel RPM diff that was in it has massive grooves cut in to it and the balls had been deformed! I guess the previous owner had tightened the diff so much that the diff-balls were just grinding. That would explain why the diff has no diff action. It's just locked. The added friction might explain why the motor overheats prematurely aswell.
I'll build these and then swap out both diffs. If that doesn't fix the grinding issue then I will have to look elsewhere...Will try and record a video of the issue tonight.
(Last edited by Willywils : 7.14.17 at 4:54 am)
Tamiya Clodbuster - the dream at 14. Traxxas X-Maxx - Reality 2017.