There is more problems with the slippage of the tires and the heat build up
in the tires and the heat build up in the clutch. I would guess 20% is a
reasonable number.
Kas Kastner
----- Original Message -----
From: "Jack W. Drews" <vinttr4@geneseo.net>
To: <racespit@mail.netzero.net>
Cc: <eisandiego@aol.com>; <fot@autox.team.net>
Sent: Thursday, August 09, 2001 10:22 AM
Subject: Re: Basic Question...Expected Hp Difference
> "racespit@mail.netzero.net" wrote:
>
> > I have heard you lose about 15% from flywheel to rear wheels, but of
course I am sure that varies due to car, weight of driveshaft components,
etc.
> >
> > Keep Triumphing,
> > Susan :)
> >
> > Original Message:
> > -----------------
> > From: EISANDIEGO@aol.com
> > Date: Thu, 9 Aug 2001 15:23:47 EDT
> > To: fot@autox.team.net
> > Subject: Basic Question...Expected Hp Difference
> >
> > What would be the typical expected % difference in hp from a engine
> > tested by itself in the lab dyno verses one tested as installed in the
car at
> > the rear wheels?
> >
> > Cary
> >
> > --------------------------------------------------------------------
> > Mail2Web - Check your email from the web at
> > http://www.mail2web.com/ .
>
> I did a search last night to see what I could find on the web regarding
chassis dyno hp vs. engine dyno hp.
>
> I found four sites that said that 15 - 20% was the difference, especially
for cars of our hp. One guy said 30%.
>
> Above is the data -- which is something separate from opinion -- and my
opinion is the 15 - 20 is right for our hp range, but I doubt that it is a
> constant percentage for all horsepowers. Maybe it is, but that would say
that a 500 hp Chevy loses 100 hp through the drivetrain.
>
> Now, where are drivetrain losses? Friction in beaarings and seals,
friction between gears in trans and rear end, and loss between tires and
chassis
> dyno rollers.
>
> I'd sure like to hear what a genuine dyno guy has to say about this.
>
>
> --
>
> uncle jack and New Blue
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