You didn't say that you had tried this, so here is the link to BrianG's calculator
http://www.scriptasylum.com/rc_speed/index.html
Losi 8T 1.0, Savage Flux - XL style, LST XXL, Muggy, 3.3 E-Revo Conversion and sitting outside 425hp, 831 Tq Dodge Ram Turbo Diesel. It SMOKES