Drivetrain Loss..

[Ghost]

Just getting ready to set up a calibration on my Dynoliscious , been scouring the interwebs to find definitive post on drivetrain power loss from crank to wheels for r32 gtst, can't find... still looking... anyone on here know/ able to help me out?

manythanks

[Skym]

Worked it out from dynochart's vs factory kw at engine to be roughly 48kw (rwd) for manual and 64kw (rwd) for auto (there's roughly a 16rwkw difference between manual and auto). Also can vary by 10kw or so between highest to lowest when a few cars (I think was 4? Nissan's) are tested back to back, which I didn't take into account. kw x 1.341 = hp.

[DreadedFist]

something like 16% for FWD and 24% for RWD cars. Not positive but I believe it's close to those numbers. AWD cars lose like 101%

[DarkCaporaL]

^ bwhahahaha

[frankiman]

powertrain loss depends on the weight and size of the flywheel and clutch, total length of driveshafts and their dimensions, size/weight of wheels-tires-brake discs
it also depends of which gear you are in
and what type of transmission is beeing used, automatic trannys lose up to 15% directly from the use of a torque converter

with man.t :
in general, its about 10-12% for a FWD, since on most FWDs everything is smaller for starters
on RWDs its around 16-18%
and AWD will be between 20-25%


on the new gen Nissan GTR, a special new type of dyno was used, measuring powertrain loss after each run,
the GTR is so well engineered that the loss was between 5% and 17% , for an AWD !!

[johnnyjohnny]

As a confirmation of those RWD percentages, I dynoed my bone-stock R33 GTS with 72,000km on it, and drivetrain loss came out at 15.5%

Of course, it can vary based on weather conditions and which dyno you use, but it's a good reference number.

[Skym]

I've read in a Aussie magazine (magazines are usually not good for accurate info) that the guy who setup the Gibson GTR's said he dynoed a RB26 engine, then fitted RB26 engine to car and dynoed car and the result for drivetrain loss was 35% for R32GTR, R33GTR and from calculations (without testing engine out of car) 25% for R34GTR. But like mentioned above about clutch, etc affecting drivetrain loss (don't know what clutch, etc, torque split, etc he used), so is probably not accurate.