[Diy_efi] BHP calculations

[Bruce]

Hahahaha,

O2 variences have no effect on HP?.   That's interesting.
How do you take into count all these changes, in one event?.
Later,
Bruce




----- Original Message -----
From: "Bernd Felsche" <bernie at innovative.iinet.net.au>
To: <diy_efi at diy-efi.org>
Sent: Monday, July 29, 2002 9:37 PM
Subject: Re: [Diy_efi] BHP calculations


> Bruce tapped away at the keyboard with:
> [top-post fixed]
>
> > ----- Original Message -----
> > From: "Bernd Felsche" <bernie at innovative.iinet.net.au>
>
> > > Hugh Keir tapped away at the keyboard with:
> > >
> > > > I am working on a spreadsheet to calculate BHP from datalogged
> > > > information.
> > > >
> > > > The basic formula I am working to is:
> > > >
> > > > Engine BHP = acceleration BHP + wind drag BHP + transmission loss
BHP.
> > >
> > > Don't forget about rolling resistance.
>
> > What about the humidity?.
>
> Accounted for in aero drag.
>
> > Variances in the gravitation pull of the earth?.
>
> Accounted for in rolling resistance.
>
> > Beginning and ending lat, long for calculating the curvature of the
earth?.
>
> Then you may as well include latitude to give you a better measure
> of curvature. :-)
>
> > Difference in weight for fuel used during the *event*.
>
> In rolling resistance.
>
> > Reduction in tire diameter for tire wear.
>
> In rolling resistance.
>
> > Increase in tire diameter due to heat, as applicable.
>
> In rolling resistance.
>
> > Variances in ambient O2
>
> Aero drag.
>
> Rolling resistance accounts for as much as 50% of power requirements
> at speeds of up to 80kmh (50mph), depending on vehicle aerodynamics
> and vehicle mass. For light vehicles, the break-even point is closer
> to 60kmh (37mph).
>
> --
> /"\ Bernd Felsche - Innovative Reckoning, Perth, Western Australia
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