Dynojet 248c, heavier rotating parts how much does it change
09-26-2003, 01:14 PM
#1
Dynojet 248c, heavier rotating parts how much does it change How much does heavier rotating parts or lighter for that fact effect a Dynojet 248c results? Like going to a lightweight driveshaft, lightweight flywheel, lightweight clutch assembly, lightweight wheels, ect.
Phillip
Phillip
09-26-2003, 03:57 PM
#2
TECH Fanatic
Re: Dynojet 248c, heavier rotating parts how much does it change Lighter = more hp, heavier = less hp.
Things rotating at engine speed (everything back thru the pinion gear in the rear end if car is in 1:1 trans ratio...4th in a M6, 3rd an A4) have maybe 4-5 times more effect than stuff rotating at wheel speed. Of course it depends on how far the extra weight is from the center of rotation. One pound removed from the tire tread means a LOT more than one pound drilled out of an axle shaft.
Similarly one pound removed from the outer edge of the flywheel means a lot more than one pound removed from the balancer.
Also, the faster you spin up the dyno, the more the lighter parts help. A 800 hp pull takes a lot less time than a 400 hp pull going from the same start to finish mph. In that respect wouldn't it be nice to be able to test all cars at the same acceleration rate to compare?
Things rotating at engine speed (everything back thru the pinion gear in the rear end if car is in 1:1 trans ratio...4th in a M6, 3rd an A4) have maybe 4-5 times more effect than stuff rotating at wheel speed. Of course it depends on how far the extra weight is from the center of rotation. One pound removed from the tire tread means a LOT more than one pound drilled out of an axle shaft.
Similarly one pound removed from the outer edge of the flywheel means a lot more than one pound removed from the balancer.
Also, the faster you spin up the dyno, the more the lighter parts help. A 800 hp pull takes a lot less time than a 400 hp pull going from the same start to finish mph. In that respect wouldn't it be nice to be able to test all cars at the same acceleration rate to compare?
