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Correct gear for dyno power run

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Old 11-25-2014, 06:34 PM
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Default Correct gear for dyno power run

Iam after some opinions from you more experienced dyno guys, when i do a power run in manual cars i use 4th gear cause its 1:1 ratio, thats how i was taught, anyway a friends car l76/t56 combo got dynoed and the operator did the power run in 5th gear, is this common practice? I assume the horsepower and torque will be lower using 5th gear? So the readout isnt that accurate
Old 11-26-2014, 05:58 PM
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Originally Posted by Jacktuner
Iam after some opinions from you more experienced dyno guys, when i do a power run in manual cars i use 4th gear cause its 1:1 ratio, thats how i was taught, anyway a friends car l76/t56 combo got dynoed and the operator did the power run in 5th gear, is this common practice? I assume the horsepower and torque will be lower using 5th gear? So the readout isnt that accurate

4th gear 1:1 is correct. Doing a pull in fifth gear is a good way to pre-detonate an engine if WOT pull is started below say 5K RPM.
Old 11-26-2014, 06:53 PM
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I dynoed my m6 ls3 in 3rd... I figure a 4th gear pull would get crazy wheel speed?
Old 11-27-2014, 12:16 AM
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Thank you
Old 11-29-2014, 01:13 AM
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Always the 1:1 gear and that so happens to be 4th.
Old 11-29-2014, 04:33 PM
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Genarally how much HP is lost using fifth gear?
Old 12-14-2014, 06:44 PM
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Theoretically you will show more hp in 5th. And less hp in 2nd or 3rd on a dynojet anyways.



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