[TypeZer0]

4.0 is 40,000 rpm. but even if u get the car goign and heading for its top speed, it'll struggle to reach that 40,000 rpm cuz in the real world, the weight of the car, rotating mass of the wheels, wind resistance and friction will keep it from reaching the 40,000 rpm redline. to even get near the redline, u'll probably want to dual or tri cell it to get enough power to push it to that speed but that means more weight and less likelyhood to reach the 40,000 rpm so i'm guessing that if u can get it going with a 1 to 1 gear set, u'll probably max out around 50 to 60 mph on a flat level surface.....after a long wait to have it accelerate to that speed. it's kinda like trying to start a real car on 5th or 6th gear, it's very hard to get teh car moving