Re: [T3] Horsepower at the wheels.

[John Jaranson <jaransonT3@comcast.net>]

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> On Sep 1, 2004, at 6:59 PM, Toby Erkson wrote:
>
> > 15%-20% loss is what I've always read when estimating hp loss from 
> > crank to wheels.
> >
> >    Toby Erkson  --  air_cooled_nut@pobox.com
> >    '72 VW Squareback, '95 VW Jetta, '81 Gold Wing, '73 Porsche 914
> >    http://www.icbm.org/
> >    Portland, Oregon
> >
> >
> >
> > Jim Adney wrote:
> >
> > > > > I can't help wondering how much loss we should expect in the drive 
> > > > > train.
> > > > The number I kept hearing at the car show was 20%.  Rule of thumb 
> > > > was a 20% loss from the flywheel to the road with a manual 
> > > > transmission.  Don't know about an automatic.  I will ask a few of 
> > > > my powertrain buddy's at Ford this question tomorrow.  20% seems 
> > > > consistent with numbers I got for Sophy.
> > >
> > > You may be right, but that sure sounds high to me.
I asked a powertrain buddy of mine at Ford today and he suggested it 
was typical in the 12-15% range for a manual transmission and a bit 
higher for an automatic.

I also surfed around the web and found this article

(http://www.superstang.com/horsepower.htm)

that explains a bunch of it pretty good and estimates of 15-17% for 
manual and 20-25% for automatic.
It also addresses Greg's question about a constant HP loss rather than 
a percentage loss.  The losses go up as HP increases for a given 
transmission.

Looks like the 15-20% is pretty good.


Later,
John Jaranson
'66 Square (Sophy)
'71 Fasty (Jane - darkside project in waiting)
various parts.....don't we all.
http://mywebpages.comcast.net/jaransonT3/jaransonT3/
http://mywebpages.comcast.net/jaransonT3/2004Invasion/
http://mywebpages.comcast.net/jaransonT3/notavwclub/

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