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The Terminator
Driveline
Gears vs. HP???
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<blockquote data-quote="jtfx6552" data-source="post: 569324" data-attributes="member: 3823"><p>This is a complicated subject.</p><p></p><p>It depends on the type of HP measurement. On an enertial load dyno, where the power is measured based on acceleration of the rear tires against a load, the higher numerical gears will have a negative effect of HP measured. In a Mustang during a 4th gear pull on a dynojet, the pull will be shorter, the higher numerical ratio of the rear. This means the tires and axles, the ring and the differential have to be accelerated from the start RPM to the end RPM in less time, which will make the driveline loss higher and the rwhp reading lower.</p><p></p><p>On a dyno that can measure while holding the engine at a fixed RPM (like an eddy current or water brake) the gears would not matter. Well they would a little since the more reduction will result in a very slight decrease in efficiency.</p><p></p><p>JT</p></blockquote><p></p>
[QUOTE="jtfx6552, post: 569324, member: 3823"] This is a complicated subject. It depends on the type of HP measurement. On an enertial load dyno, where the power is measured based on acceleration of the rear tires against a load, the higher numerical gears will have a negative effect of HP measured. In a Mustang during a 4th gear pull on a dynojet, the pull will be shorter, the higher numerical ratio of the rear. This means the tires and axles, the ring and the differential have to be accelerated from the start RPM to the end RPM in less time, which will make the driveline loss higher and the rwhp reading lower. On a dyno that can measure while holding the engine at a fixed RPM (like an eddy current or water brake) the gears would not matter. Well they would a little since the more reduction will result in a very slight decrease in efficiency. JT [/QUOTE]
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Gears vs. HP???
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