The Quark sets its LVC from 2.2v to 3.0v per cell.

Oops, I just noticed that Tazz has an MGM160, not a Quark 125. How does the MGM set lvc?

MGM sets its LVC to 3.1v/cell. That sounds like it is the problem! Set it to the "RPM reduce" setting, assuming you aren't using it already.

I think I have it set to "motor cutoff". I will try the "slow reduce rpm" setting this week. I may try an 8XL. How well would it perform on 14.8v and do you think it would cure this problem.

If it's a more mild motor, then it should reduce the current draw. Using the "slow reduce RPM" setting should have a noticable effect.

It is amilder motor that is why I was questioning the performance. An 8XL on 4s is only going to do about 27,750 rpm max. On 5s it will do about 35,700 rpm max. I want to stay with 4s. I will try the "slow reduce RPM" setting before I do anything else.

OK, I changed to "slow reduce RPM" and it fixed the problem. Now all I have to do is get the gearing correct. I am running 20/70 (RR slipper because I have a few of them and alot of 5mm 32 pitch pinions) and my temps are motor: 180-185, esc: 125-130 and batteries: 105-110.

Your motor is way to hot.

I know, that is why I said I have to get the gearing correct. I started with 21/66 (3.14) (motor hit 200 in about 4 min.) then went to 20/68 (3.4)(motor 170-175 10-12 min.) to 20/70 (3.5)(motor 180-185 10-12 min.). I need to maybe try a 3.3 ratio. Do you have any suggestions?

Thats odd....It goes from 200 to 175 to 185.... Anywho, I think its undergeared possible but I'm not sure. Hot motor, cool controller, cool batteries=under geared. But your batteries and esc are about right...

Did you drive it the same all three times and did you have the same outside temps?

Not sure on the temps (3 diff. days) but I drove it in the same area and manner every time.