no changing the rear end gearing does not change the tork rating much . on my car (the diasio )using my friends mustang dyno with only a rearend gearing change we got a lowest tork of 78 to a high of 96 . with the HP about the same with all the gearing changes . so it may not seam great if your pushing high numbers but if your not talking about high number than it is a big deferents with changing your gearing . you have to remember we are not talking about a car that pumps out 400 FT LBS of tork . i'm talking about a car with low hp and tork numbers . so if i go by the worksheet and plug in my low numbers of hp and tork we got it puts me in super B if i plug in the high numbers i got it puts me into super A . or if i go by the hp and tork specs out of my repair manual i'm am i super B .Chrispy wrote:You can change the rear-end all you want, it shouldn't alter your dyno results significantly on a modern load sensing dyno (Mustang, Dyno Dynamics etc). The dyno is only measuring HP, torque is just displayed as a factor of HP over RPM.962porsche wrote: tork at the wheels is meaningless is just what i'm saying ! tork numbers at the wheels change greatly they are for the most part are taken in top gear but on cars were you can change out your gearing at the rear axle at any time in the matter of minutes it becomes a plus if your playing with numbers and how you want your car classed . on the other hand for motors on motorcycles and snowmobiles the tork and hp numbers are taken at the counter shaft not the crank .
now i could just BS every one ! i have 3 motors for my car one stock one with a mild build and one that is a totaly built . because i can do a motor change in 35 minutes what specs would i give out ? the 2008 motor that dynoed at 229 hp with 103 tork the 2002 mild built motor dynoed with 163 hp and 92 torks or the 2001 stock motor with 150 hp and 80 torks that was never dynoed ?