I used to have a formula we used on our dyno at my school to figure out a cars rear end ratio....by running the car in 4th gear (1:1 ratio) at 2,000 rpms, see what mph your at, multiply the speed to the rpm, then multiply that to the tire diameter, then devide it to 1270 or something like that...Anybody know??? I might be changing my rear gears soon but dont even know what gears I have, (previous owner says 373 but i dont believe it)...5th gear...3,000 rpms...75mph... .....and have to drive a 14 hour drive in a couple weeks from tn to NJ and I dont want to be getting like 5mpg and wearing out my freshly built motor from cruising at the high rpm for soo long.
Also: help me decide what gears I should get...im already sold on FRPP...tell me what all of you have (gear ratio) and where your rpms are at at a certain mph in 5th gear...ThankS :SNSign:
Also: help me decide what gears I should get...im already sold on FRPP...tell me what all of you have (gear ratio) and where your rpms are at at a certain mph in 5th gear...ThankS :SNSign: