return to dirt
03-10-2012, 12:39 PM
i know that changing the final by say a 0.10 will change the rpms by about 100 rpm. is there a formula for figuring rpm change going from say a 75" 235-60/13 to a 86" 255-60/15? the chico track i will be running at can be very rough. cars bottom out going through the ruts. it's also a large 1/4mi compared to my local 1/5mi track. i know the 15s are heavier but if i can go through the corners faster it will be worth it. last year we had cars whos starters and exhausts would break if you got off the bottom. my own pinto started jumping out of gear. by using multifit wheels i can run 15s at one track and then put my 13s back on for my local track without changing gears IF my rpms will be where i need them. thanks.
olin
olin