DYNO - rear wheel horsepower conversion
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From: Tallahassee, Florida
2006 SL600, 2001 S500, 1996 SL320
DYNO - rear wheel horsepower conversion
On a car like mine, 2006 SL600, what percentage would you use to convert rear wheel horsepower. I have been told anywhere from 15% to 25% LOSS.
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new balance
Whats being done to your car now Stephen?
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From: REHOBOTH BEACH DE
88-300CE TWIN TURBO, 99-C43, 05-G55K, 71-280SL, 94-E320 CAB, 08 CLK63 BLACK SERIES
Mustang dyno which is a load type may show drive train loss as much as 30%
Dynojet which is an inertia type will show 10%-15% depending on weight of car.
Just completed a twin turbo install on a 3.0L M103-12V.
Base line pull was 30% from published flywheel numbers.
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The accepted power train loss numbers for MB are 18% loss for autos and 15% loss for manuals. Bob Brady from Renntech confirmed this to me as well as just about any major MB tuner out there so you are very safe to use these percentages. 2 years ago Acura was claiming a certyain bhp numbedr for thier car and once tested it was shown to be 15bhp lower so the SAE recalculated the program for determinng BHP and still I know some new cars still have high end BHP claims. Dyno jet tells all. Top Gear road tested the new Mustang Shelby GT500 and it made less than what Ford claimed. The video is on Youtube.
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top gear shelby
The accepted power train loss numbers for MB are 18% loss for autos and 15% loss for manuals. Bob Brady from Renntech confirmed this to me as well as just about any major MB tuner out there so you are very safe to use these percentages. 2 years ago Acura was claiming a certyain bhp numbedr for thier car and once tested it was shown to be 15bhp lower so the SAE recalculated the program for determinng BHP and still I know some new cars still have high end BHP claims. Dyno jet tells all. Top Gear road tested the new Mustang Shelby GT500 and it made less than what Ford claimed. The video is on Youtube.
Last edited by new guy; Aug 17, 2007 at 12:25 AM.
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In fact, here's the video:
http://www.youtube.com/watch?v=mGbhKQlUhLo
Pay close attention at 3 minutes, 30 seconds. This is when they put it on the dyno. It puts down 447 rwhp, which is approx 525 at the crank with a 15% drivetrain loss. 25 hp MORE than Ford claims.
Top Gear = Idiots.
http://www.youtube.com/watch?v=mGbhKQlUhLo
Pay close attention at 3 minutes, 30 seconds. This is when they put it on the dyno. It puts down 447 rwhp, which is approx 525 at the crank with a 15% drivetrain loss. 25 hp MORE than Ford claims.
Top Gear = Idiots.
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From: Portland, OR
2001 E55K
I've had good luck with using 1.21 as a factor for dynojet(~18% loss) and 1.28 as a factor for mustang dynos (~22% loss).
Reference:
https://mbworld.org/forums/showpost....0&postcount=16
Reference:
https://mbworld.org/forums/showpost....0&postcount=16
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