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Board: Porsche - 911 - 996 - Turbo
Language: English
Region: Worldwide
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May 21, 2003 4:29:46 AM
- Joe Weinstein
- Junior
-
- Loc:
- Posts: 56, Gallery
- Registered on: Aug 1, 2002
- Reply to: pierre
Re: Dyno-diagramm
Hi. I can't read the chart well... Can you tell me what
drivertrain loss percentage was assumed (or measured)?
In other words, I don't expect you got 424hp to the
wheels, but that whatever you got to the wheels was
multiplied by a factor tp compensate for drivetrain losses,
and I am wondering what that was. Was this a 4-wheel
dyno, ot a 2-wheel?
thanks
Joe
drivertrain loss percentage was assumed (or measured)?
In other words, I don't expect you got 424hp to the
wheels, but that whatever you got to the wheels was
multiplied by a factor tp compensate for drivetrain losses,
and I am wondering what that was. Was this a 4-wheel
dyno, ot a 2-wheel?
thanks
Joe
May 21, 2003 7:51:07 AM
- pierre
- Veteran
-
- Loc: there , Switzerland
- Posts: 1192, Gallery
- Registered on: Apr 7, 2002
- Reply to: Joe Weinstein
May 21, 2003 4:24:02 PM
- Joe Weinstein
- Junior
-
- Loc:
- Posts: 56, Gallery
- Registered on: Aug 1, 2002
- Reply to: pierre
Re: Dyno-diagramm
Ok. So they found/calculated/assumed a 23% drivetrain loss
meaning that the motor was producing 395hp at the crank
to give you your actual 305hp. Then they adjusted the
numbers for the less-than-ideal conditions, to state that under
ideal conditions you'd get another 30hp at the crank, for 424.
I am interested in the 23%. I hear mostly of 2-wheel dynos
here. They disconnect the front drive shaft before testing.
The measured drivetrain loss I hear about in those cases
is about 15%, so 23% would seem to indicate a significant
further loss from the front driveshaft to the front wheels.
meaning that the motor was producing 395hp at the crank
to give you your actual 305hp. Then they adjusted the
numbers for the less-than-ideal conditions, to state that under
ideal conditions you'd get another 30hp at the crank, for 424.
I am interested in the 23%. I hear mostly of 2-wheel dynos
here. They disconnect the front drive shaft before testing.
The measured drivetrain loss I hear about in those cases
is about 15%, so 23% would seem to indicate a significant
further loss from the front driveshaft to the front wheels.
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