[Diy_efi] BHP calculations

[Bernd Felsche]

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).

-- 
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