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Finnster · 03.17.2008, 10:19 AM

The controllers themselves have a max rpm rating as the others have eluded to. What is it for the Q125? I remember the 9920 was rated ~150K rpms for a 2-pole motor. Since the Mega is 6-pole, the max rpms is going to be 1/3 of that, ie 50K rpms.

If you are trying to run a 6pole at over 60K rpms, you need to have a controller capable of ~200K rpms on a 2pole.

Also, the ET is an invaluable tool for figuring out the specs of a system. I think maybe you need to backoff the gearing and voltage and work your way up befoer trying to blow off the barn doors on the 1st run. This is an 1/8th scale car right? Really you are looking at prolly 2500W peak watts or so already on 4S if you are doing 69. You may be pulling close to 200A already. I'm not so sure that is the right controller for what you are trying to do. A MGM 22018 may be better and would run 6S more reliably as well.

	(#20)
Finnster KillaHurtz Offline Posts: 2,958 Join Date: Apr 2006 Location: Bucks Co, PA	03.17.2008, 10:19 AM The controllers themselves have a max rpm rating as the others have eluded to. What is it for the Q125? I remember the 9920 was rated ~150K rpms for a 2-pole motor. Since the Mega is 6-pole, the max rpms is going to be 1/3 of that, ie 50K rpms. If you are trying to run a 6pole at over 60K rpms, you need to have a controller capable of ~200K rpms on a 2pole. Also, the ET is an invaluable tool for figuring out the specs of a system. I think maybe you need to backoff the gearing and voltage and work your way up befoer trying to blow off the barn doors on the 1st run. This is an 1/8th scale car right? Really you are looking at prolly 2500W peak watts or so already on 4S if you are doing 69. You may be pulling close to 200A already. I'm not so sure that is the right controller for what you are trying to do. A MGM 22018 may be better and would run 6S more reliably as well.