ok i got it in and it was geared 15/46

lipo lvc set at 12.8v, punch @ 60% and all settings were on low/lowest

almost zero cogging

After 15 min of hard speed runs(5 min) and bashing(10 min) temps were as follows...........

Mamba Max with holes in case,fan,novak cap = 110*f
Max Amps 4s 5k lipos = 115*f
Center Diff 30k = 145*f
Tekno Neu 1515 1y/f = 145*f

i feel that the gearing would be about right if i had a higher "C" battery, maybe a 16t for tracks with longer straights

i am very`happy with the results and cant wait till i get a better battery for this