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On 31 Aug 2004 at 23:42, John Jaranson wrote: > The number I kept hearing at the car show was 20%. Rule of thumb was a > 20% loss from the flywheel to the road with a manual transmission. > Don't know about an automatic. I will ask a few of my powertrain > buddy's at Ford this question tomorrow. 20% seems consistent with > numbers I got for Sophy. The Bill Fisher book has some interesting comments on dynos and their use. He mentions that every dyno operator has his own "correction factors" which he folds in to "correct" the inaccuracies in his dyno measurements. Oddly enough these factors are always greater than 1. It seems that no one likes the numbers that come out of the dyno as-is, so they always do something to make the numbers bigger. I suspect that using a 20% loss figure for a tranny is similar to this. I think your numbers are pretty reasonable, if you start with a basic output figure of 54 hp. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~ Shameless link for search engines: http://listarchive.type3.org ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~