How much weighs your truggy brushless ?

[captain harlock]

Pierre, as long as we can understand your point, there's no reason why you should apologize for your weak English. Not that MY English is strong..:)

A good tip to get the power of the sixteen cells with only 4s lipos is to push your wallet up a bit and get yourself a pair of TrakPower's 4900mah 2s1p packs. They do produce monsterous raw power.
I even doubt your current sub-c cells are of the highenders.
A very good sub-c pack would cost over $100 sometimes. I'd rather spend it on a highend lipo, instead.
Get the TrakPower lipos!