We have had all of our race car engines on the dyno ... and then the whole car on a quality Superflow chassis/wheel dyno over the last 8 years.
This is around 35-40 cars & engines ... some with manual trans & 9" Fords & some with direct drive & quick change rear ends.
For all the "standard" drivetrains, we measured 18.1-18.8% difference (loss) from the engine dyno.
For cars we reduced the parasitic losses in ... with REM polished gears, ceramic bearings, no drag seals, lightened gears, etc ... we saw 16.4-16.8% difference (loss) from the engine dyno.
But we never lightened up parts that would have reduced the reliability, like driveshafts, u-joints, etc. More could be gained, but the risk wasn't worth it to us.
Last edited by Ron Sutton; 05-20-2013 at 06:42 PM.
|