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      08-16-2006, 10:04 PM   #92
Asiann
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Drives: 2012 535i MSport
Join Date: Dec 2005
Location: Honolulu

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2012 BMW 535i  [0.00]
2008 750Li  [0.00]
2006 BMW  [0.00]
Just some more info on Dynos.

Typically, a Dynojet dynamometer will record a "loss" of 15-18% for manual drivetrains, and 22-25% for automatic drivetrains. The Dynojet dynos are passive rolling load type dynamometers, so the vehicle is tested while accelerating. Some additional energy is lost accelerating the engine and drivetrain components themselves, so there is not really this much "loss", but that is for another technical discussion. If you have ever wondered why manual transmission equipped cars are generally faster than their automatic counterparts, the difference in drivetrain efficiency is a big part of that, along with the fact that manuals tend to have an extra gear with more aggressive ratios than automatic transmissions. Here is a very good article about the Dynos and also how tire and wheel sizes/weight can make a difference. http://www.maxima.org/shoptalk/sub_r...ns/index.shtml
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