[Diy_efi] BHP calculations

[Bruce]

So you sticking to O2 levels having no effect on HP, interesting.
Feel free to investigate the matter with a Top Fuel team.
Bruce


----- Original Message -----
From: "Bernd Felsche" <bernie at innovative.iinet.net.au>
To: <diy_efi at diy-efi.org>
Sent: Monday, July 29, 2002 10:22 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
> >> 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.
>
> >> > 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.
>
> > Hahahaha,
>
> > O2 variences have no effect on HP?.   That's interesting.
>
> Aerodynamic drag is largely determined by the density of air. (At
> least for bluff-bodied cars.)
>
> > How do you take into count all these changes, in one event?.
>
> Too much to write here:
> See Bosch Automotive Handbook - chapter titled "Motor Vehicle
> Dynamics" - p338ff in 5th English edition or chapter titled "Dynamik
> der Kraftfahrzeuge" - p330ff in 22nd German edition.
>
> >> 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
> \ /  ASCII ribbon campaign | I'm a .signature virus!
>  X   against HTML mail     | Copy me into your ~/.signature
> / \  and postings          | to help me spread!
>
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> http://www.diy-efi.org/mailman/listinfo/diy_efi


_______________________________________________
Diy_efi mailing list
Diy_efi at diy-efi.org
http://www.diy-efi.org/mailman/listinfo/diy_efi