Hi, i have a hpi nitro rs4 3 with 47/43 spur gear and 18/22 pinion gear all standard also standard engine please i need to have high acceleration. our track in egypt need to have high acceleration more than top speed so what is the perfect thing to do and also my car start very slow and also in hard corner it is too slow too accelerate

thank you

ahmed riad

HI do you have your motor tuned that helps with take off and top end speed

The tallest gears you can get is a 19/23pinions, the red gears and 45/41 as seen [link=http://www.hpiracing.com/graphics/instr/76977-1.jpg]in this photo[/link] which isnt much extra top end

HPI doesnt make very tall gearing for some reason...

yes i tuned my motor and still doesn't accelerate

You may want to try 17/21 gears but you may also need to buy motor mounts so you can adjust the gear mesh.

please can any one send me the gear ratio for nitro