View Full Version : st185 drivetrain loss

12-15-2009, 10:51 PM
does anyone know the average percentage for a 91 all-trac?

12-15-2009, 11:16 PM
How precise an answer are you looking for, because it varies, not just model to model, but even car to car, depending on the condition of bearings, gear oil, and other little factors. The only real way to find out is take it to a corrected dyno that uses a run down to calculate driveline loss.

But I think losses are in the 20% area for AWD cars, about 15% for RWD, and about 12% for FWD...I think...

Someone correct me if I'm wrong.

12-15-2009, 11:59 PM
I heard it was closer to 25% for AWD and 20% for FWD & RWD.

Don't know for sure though.

12-16-2009, 12:20 AM
Go with 20-25 for AWD. 15 for RWD. And 10 for FWD.

12-16-2009, 12:41 AM
From what I've read over the years (Hot Rod, Car Craft), rwd lose is about 20-25%. FWD maybe a little less but not that much. You're still turning the transmission gear set and the final drive diff as well. AWD is probably in the 25-30% range. I've seen it discussed on AT.net but I forget what the consensus was on it.

It will also make a difference whether you're automatic or manual transmission (I know this doesn't apply to the All Trac). With a torque converter auto box, you're losses going to be higher due the torque converter.

12-16-2009, 02:18 AM
so im guessing roughly 23% thanks guys :) now toget my all-trac weight figured out. ill see if my local recycling place can do it