Ok so, to summuarize, as long as you can keep the mosfet temperature below for say 70 to 80°C, you can pull as much current on 6S as with the XLX for example but due to the small physical size of the MMX, and in particular it's little heatsink, it's much harder to keep it cool, even with big air flow fan like a FFB0412VHN fan.

But, 200Amps continuous WOT without current limitation for less than 20 seconds (with 400Amps peaks due to the current limiter) on 6S with a very good air flow, a big cap pack and good reliability is possible, to do some speed run without going into flames for example :) The XXL is usually prefered for with but it is heavy and really big !

How much contiuous current the MMX survive at partial throttle as it does not has the active freewheeling software feature ?

If the MMX would be watercooled, what would be the maximum continuous current WOT can be sustained indefinitly ?

Like you said here https://www.rc-monster.com/forum/sho...59&postcount=5 monster X uses NEW MOSFET from Toshiba, fast switching, ultra-low RDSon (770 microohms typical), and at time of writing, the new toshiba mosfet line (released November 04, 2014) was U-MOS IX (see https://www.businesswire.com/news/ho...FET-U-MOS-IX-H and https://toshiba.semicon-storage.com/...ets_201601.pdf) and so at that time the only U-MOS IX mosfet available was 40V ref (TPHR8504PL and TPWR8004PL sub mirco ohm), the 30V ref was not available at tis time (TPHR6503PL available 11/2015) and so 8S is possible with 40V ref ! And like you said in another post somewhere in this forum, there is only one revision of the MMX so... :) Am I Right ?