[Diy_efi] Wind resistance calculator - FYI

[Hugh Keir]

Thanks Scott,

I posted these links and a couple of others on here some time ago.

The advantage of doing it yourself is that I already have a datalog of most
of the engines parameters and being able to see the BHP against the air /
fuel ratio, engine knock level and ignition timing several times a second
means that the optimisation process is for me simpler, safer for the engine
and more interesting.

I also use the spreadsheet to highlight results where the knock is above a
certain level and the AFR is richer or leaner than needed.

I am also able to use the spreadsheet to highlight which Load and RPM point
was being used again speeding up the tuning process.

I also do this for a hobby not a living.

I haven't checked these links, but here are the others I previously posted.

On Track Dyno       http://www.ontrackdigital.com/generic.html?pid=4
Revtrigger             http://www.students.tut.fi/~eppu/bin/rev.html#Updates

Cheers

Hugh


----- Original Message -----
From: "Scott Campbell." <scampbell at mrccos.com>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, December 18, 2002 7:48 PM
Subject: Re: [Diy_efi] Wind resistance calculator - FYI


> Hugh,
>
> You may enjoy reinventing the wheel, and that is OK, but for us lazy types
there is a nice little program called StreetDyno:
> http://www.tweecer.com/StreetDyno/
>
> and another one called RoadDyno:
> http://www.charm.net/~mchaney/roaddyno/dyno.htm
>
> They do lack your AFR correlation though.
>
> Scott.
>
> Hugh Keir wrote:
>
> > Here is a great set of worked calculations that take you through it step
by
> > step.
> >
> > http://members.home.net/rck/phor/06-Speed.html titled The Physics of
Racing,
> > Part 6: Speed and Horsepower
> >
> > I have been using them to produce a spreadsheet to calculate BHP, torque
etc
> > using a datalogged RPM and vehicle speed signal.
> >
> > The density of air changes with humidity / pressure which I also added
to
> > the calculations.
> >
> > I also have a column for AFR from my DIY wideband to look for the best
> > acceleration against which AFR
> >
> > My spreadsheet is 95% finished, I still have some problems with the
numbers
> > in the dyno sheet.
> >
> > What have you used to obtain your datalog?
> >
> > Hugh
>
>
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>


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