engine VS chassis DYNO #s?
Thread Starter
Pro
Joined: Jun 2005
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From: Fredericksburg VA
engine VS chassis DYNO #s?
Looking to see what the power loss is going from an engine dyno to a chassis dyno. I thought I read that a vette with the independent rear has more of a loss close to 18%. Additional info…I have a 4spd in the car this should be better than an automatic. Does anyone know what the actual # is?
Drifting
Joined: Jul 2002
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From: Rosemount MN
My engine dyno numbers had the engine completely unencumbered by accesories, no alternator, P.S. and an electric water pump.
Subtracting 23 H.P. for alt., P.S. and water pump it was exactly an 18% loss.
'79 with Muncie (not BW) 4-Speed.
Subtracting 23 H.P. for alt., P.S. and water pump it was exactly an 18% loss.
'79 with Muncie (not BW) 4-Speed.
Drifting
Joined: Jul 2002
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From: Rosemount MN
Originally Posted by waterplay
Just to make sure that I understand what you said. You lost 18% of your power when you went from an engine dyno to a chassis dyno?
So overall my rear wheel horsepower was 105 H.P lower than my flywheel horsepower.
Thread Starter
Pro
Joined: Jun 2005
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From: Fredericksburg VA
18% is what I thought. I am on my way to the Dyno (chassis) on Friday so I wanted to have an estimate of what the eng was making. I hope I have something to brag about Friday afternoon. The main reason for doing the Dyno tune is to make sure that everything is correct and working to its best.
Instructor
Joined: Jul 2003
Posts: 241
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From: Lake Anna Virginia
Originally Posted by waterplay
18% is what I thought. I am on my way to the Dyno (chassis) on Friday so I wanted to have an estimate of what the eng was making. I hope I have something to brag about Friday afternoon. The main reason for doing the Dyno tune is to make sure that everything is correct and working to its best.
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From: Lakeland, FL
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You loose about 12% - 15% with a manual transmission and 20 - 25% with automatic. High Stall converters will cost you even more than that. Add another 5 - 12 % accessory loss IF the engine dyno run was done without mufflers and accessories. If the engine dyno run was done with all the accessories, the drivetrain loss should only be like stated in the top of this post.
Last edited by GrandSportC3; Sep 13, 2006 at 09:19 AM.
