MMM Explodes into FLAMES!

[suicideneil]

Originally Posted by shaunjohnson

did you even read what i wrote?

Yes, you talk about blown caps due to over voltage, I talk about a dem-magged motor due to excessive heat, that then causes massive current draw trying to get the motor spinning; that much current will cook the fets.

Blown caps due to over voltage seems unlikely as:

A) Its a 25v esc, the caps are spec'd for 35v- I dont know where you're getting 40v from, but it aint happening. The voltage being put back into the batts as a result of regenerative braking is no more than a few mV, as proven by a nice eagletree graph someone did back along as a practicle test.

B) I dont need a B as my A was so great

The hot lipo packs would seem to support the 'massive current draw as a result of trying to turn over a dead motor theory'. Could be something else that is going pop though, but aparently castle (and HPI...) can access some sort of data recording chip inside the esc to do an autopsy....

[BrianG]

Originally Posted by suicideneil

...but aparently castle (and HPI...) can access some sort of data recording chip inside the esc to do an autopsy....

lol, an ESC "black box" (like they have in airplanes).

[shaunjohnson]

these type of failures MUST be caused by setups
i cant get my MMM over 150 (fan is on very briefly after stopping) under HARD load and on 6s.
but i also USE the punch control and the throttle curve so no standing backflips for me, it will wheelie if i mash the throttle but i avoid that cause the tyres cant take it (center diff)
my motoer never even hits 120 and it's geared for 45mph on 6s.

i wanted to go up to 40 series on the reace truck...but needless to say gearing down is on order, but then regen brake load is increased from the extra enertia.

and personaly i have never heard on anyone killing one of the castle/neu 2200's from overheating

kinda need a recomended setup in the boxes of traxxas and HPI since both company's are speed obsessed but in reality, unless treated nicely and you are running great lipo's then the future looks overcast...
and the standing backflip video's on HPI's forum...they cant have possibly done that geared for 70mph