Li-Ion Power Tool cells work great for RC!

[BrianG]

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

[cart213]

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

[MetalMan]

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.

[Tazz]

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.

[MetalMan]

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.

[Tazz]

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.

[Tazz]

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.

[squeeforever]

Your motor is way to hot.

[Tazz]

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?

[squeeforever]

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...

[coolhandcountry]

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

[Tazz]

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