question on HP and how its measured (LAC)

ricematthews ricematthews@msn.com
Fri, 26 Jul 2002 19:19:15 -0400


Jack:

This link pretty much sums it up as I understand it - that from 1972 on
horsepower ("net hp") is measured at the wheel with all accessories
installed.
http://vintagecars.about.com/library/weekly/aa041198.htm

-Mark



----- Original Message -----
From: "Jack Gagnon" <bullitt@cybertours.com>
To: "ricematthews" <ricematthews@msn.com>; <tlum@flash.net>
Cc: <quattro@audifans.com>
Sent: Wednesday, July 24, 2002 6:29 PM
Subject: RE: question on HP and how its measured (LAC)


> I don't think so.  I am Pretty sure the change was gross vs net which
means
> that all accessories such as water pumps, alternator paoer steering pumps
> need to be on the engine when testing. Not RWHP.
>
> Jack
>
> -----Original Message-----
> From: quattro-admin@audifans.com [mailto:quattro-admin@audifans.com]On
> Behalf Of ricematthews
> Sent: Wednesday, July 24, 2002 2:08 AM
> To: tlum@flash.net
> Cc: quattro@audifans.com
> Subject: Re: question on HP and how its measured (LAC)
>
>
> It was always my understanding that as of about 1968 (or maybe it was 1971
> or 1973?), all auto manufacturers were supposed to report their hp ratings
> at the wheel.  Before that time, most ratings were taken at the
crankshaft.
>
> -Mark
>
> **********************************************
>
>
> Hi gang,
>
> Since we have a discussion on horsepower today, I was wondering where
> manufacturers are specifying the rating.  Is it at the crankshaft or at
the
> wheel?  If its at the crankshaft are the manufacturers measuring the
output
> on a test stand?
>
> For reference, some of you may recall that I ran my urq on the 4 wheel
dyno
> at ATP a while ago and recorded a max of 152.2 HP at the wheel.  In
> contrast, a stock A4 1.8T rated 150HP, measures only 99 at the wheel.  On
> the other hand a modified S4 (2.7 V6 bi-turbo) measured 295 HP at the
> wheels.
>
> Regards,
>
> -Tony
> urq #900302
>
>
>
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