C5 drivetrain loss
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From: GARDENA Ca, State Of Konfusion
St. Jude Donor '05
Re: C5 drivetrain loss (kewlbrz)
~15% for manuals~17% for automaticsto get crank HP, take RWHP and divide by .85 (manauls) or .83 (autos)
~15% for manuals~20% for automatics to get crank HP, take RWHP and divide by .85 (manauls) or .80 (autos)
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From: God Bless America
Re: C5 drivetrain loss (wallstAL)
This has been the standard since I have been here, or the A4!
~15% for manuals~20% for automatics to get crank HP, take RWHP and divide by .85 (manauls) or .80 (autos)
~15% for manuals~20% for automatics to get crank HP, take RWHP and divide by .85 (manauls) or .80 (autos)
:yesnod: [Modified by MDL-01C5, 3:28 AM 6/1/2002]
Le Mans Master
Joined: Apr 2001
Posts: 5,331
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Re: C5 drivetrain loss (kewlbrz)
~15% for manuals
~17% for automatics
to get crank HP, take RWHP and divide by .85 (manauls) or .83 (autos)
~17% for automatics
to get crank HP, take RWHP and divide by .85 (manauls) or .83 (autos)
400rwhp/.85=470fwhp vs. an auto which would be 400rwhp/.83=482fwhp
therefore all stock A4's have a hp advantage over M6's???
I guess you could say that a stock car has the hp rated @ the flywheel so the equation works to show A4's have less rwhp but in the real world we don't get data from flywheel dyno's...just rw dyno's.
so when I dyno next to an A4 and come out with identical #'s then the A4 has more fwhp???
[Modified by Gary2KC5, 12:53 PM 6/1/2002]
Melting Slicks
Joined: Aug 2000
Posts: 2,304
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From: Green Bay WI
Re: C5 drivetrain loss (Gary2KC5)
~15% for manuals
~17% for automatics
to get crank HP, take RWHP and divide by .85 (manauls) or .83 (autos)
so drivetrain loss is greater in manuals?
I guess you could say that a stock car has the hp rated @ the flywheel so the equation works to show A4's have less rwhp but in the real world we don't get data from flywheel dyno's...just rw dyno's.
so when I dyno next to an A4 and come out with identical #'s then the A4 has more fwhp???
400rwhp/.85=470fwhp vs. an auto which would be 400rwhp/.83=482fwhp
therefore all stock A4's have a hp advantage over M6's???
[Modified by Gary2KC5, 12:53 PM 6/1/2002]
~17% for automatics
to get crank HP, take RWHP and divide by .85 (manauls) or .83 (autos)
so drivetrain loss is greater in manuals?
I guess you could say that a stock car has the hp rated @ the flywheel so the equation works to show A4's have less rwhp but in the real world we don't get data from flywheel dyno's...just rw dyno's.
so when I dyno next to an A4 and come out with identical #'s then the A4 has more fwhp???
400rwhp/.85=470fwhp vs. an auto which would be 400rwhp/.83=482fwhp
therefore all stock A4's have a hp advantage over M6's???
[Modified by Gary2KC5, 12:53 PM 6/1/2002]
a 470 hp motor in an automatic = 390 @ the rear wheels (390 rwhp/.83 = 470 hp)
The manual is more efficient at transferring power to the rear wheels. :smash:
[Modified by CliffB-99, 1:00 PM 6/1/2002]
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From: Fort Worth Texas
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Re: C5 drivetrain loss (Gary2KC5)
~15% for manuals
~17% for automatics
to get crank HP, take RWHP and divide by .85 (manauls) or .83 (autos)
so drivetrain loss is greater in manuals?
400rwhp/.85=470fwhp vs. an auto which would be 400rwhp/.83=482fwhp
therefore all stock A4's have a hp advantage over M6's???
I guess you could say that a stock car has the hp rated @ the flywheel so the equation works to show A4's have less rwhp but in the real world we don't get data from flywheel dyno's...just rw dyno's.
so when I dyno next to an A4 and come out with identical #'s then the A4 has more fwhp???
[Modified by Gary2KC5, 12:53 PM 6/1/2002]
~17% for automatics
to get crank HP, take RWHP and divide by .85 (manauls) or .83 (autos)
so drivetrain loss is greater in manuals?
400rwhp/.85=470fwhp vs. an auto which would be 400rwhp/.83=482fwhp
therefore all stock A4's have a hp advantage over M6's???
I guess you could say that a stock car has the hp rated @ the flywheel so the equation works to show A4's have less rwhp but in the real world we don't get data from flywheel dyno's...just rw dyno's.
so when I dyno next to an A4 and come out with identical #'s then the A4 has more fwhp???
[Modified by Gary2KC5, 12:53 PM 6/1/2002]
Le Mans Master
Joined: Apr 2001
Posts: 5,331
Likes: 39
Re: C5 drivetrain loss (kewlbrz)
...Your using an example that starts with 400RWHP for both cars...
My misunderstanding is when you only know RWHP, like on a dyno.
On my last dyno run it resulted in 355 rwhp. I noticed that WallstAl's sig also shows dyno #'s of 355 but he has an A4. therefore what your saying is that the A4 has more FWHP to generate the same RWHP?
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From: Fort Worth Texas
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Re: C5 drivetrain loss (Gary2KC5)
...Your using an example that starts with 400RWHP for both cars...
I can see how the equation works when you know the FWHP and want to calc the RWHP.
My misunderstanding is when you only know RWHP, like on a dyno.
On my last dyno run it resulted in 355 rwhp. I noticed that WallstAl's sig also shows dyno #'s of 355 but he has an A4. therefore what your saying is that the A4 has more FWHP to generate the same RWHP?
I can see how the equation works when you know the FWHP and want to calc the RWHP.
My misunderstanding is when you only know RWHP, like on a dyno.
On my last dyno run it resulted in 355 rwhp. I noticed that WallstAl's sig also shows dyno #'s of 355 but he has an A4. therefore what your saying is that the A4 has more FWHP to generate the same RWHP?
When calculating FWHP Loss, you subtract a percentage from the crank.
An A4 looses more than a MN6 by the time it reaches the rear wheels.
When calculating RWHP, you take the inverse proportion. To simply add (for instance in an MN6 355rwhp * 1.15) would be wrong. You must take 355rwhp / .85
[Modified by kewlbrz, 6:09 PM 6/3/2002]
