Is 4S+3S in serie possible?

[suicideneil]

Jesus, thats fast enough to make you a dude in my books!

Anyways, there is a guy by the handle of jzemaxx who put a neu 1521 1.5d in his 1:8 scale XTM MMT, though he used a custom ordered 1524 1700kv motor for his record attempt and made it to 80.4mph, though he was running a somewhat higher voltage @ 10s (several threads, this and this one are a good read).. I think the smaller neu you are using will produce more power on the same voltage compared to the larger neu (based on my fuzzy logic/mathes), but if you were to step up to a higher voltage MGM, use the larger and lower kv neu, it would easily produce much more power to get you to that ~100mph goal. My only concerns then would be tyres exploding, tranny and diffs exploding, and general aero dynamics- very long upside down skids as seen in that video.

However, you can belt the tyres or use MT foams, beef up the diffs with rc-monster hybrids or LST2 modified diffs to fit the erevo bulks, and a drag-bar or very big wheelie bar should help keep the nose down, along with maybe a front wing.