setting ignition curves without dyno

[Barry E. King]

For one of the more innovative and cheapest dyno solutions I have seen,
check out what this guy has to offer:

http://www.charm.net/~mchaney/homedyno/dynokit.htm

Basically it measures ignition spark over time.  Given transmission gear,
final drive ratios and vehicle weight you can calculate horsepower using the
same formulae a conventional dyno uses.  The software he has written does
just this.  Adjusting for drag can get you within a few HP of a chassis
dyno.

I haven't tried it out (I have a G-Tech) but I might since it looks much
easier and less finicky than the G-Tech.


Regards,

Barry

> -----Original Message-----
> From: owner-diy_efi at efi332.eng.ohio-state.edu
> [mailto:owner-diy_efi at efi332.eng.ohio-state.edu]On Behalf Of Tom Sharpe
> Sent: Wednesday, November 11, 1998 8:14 PM
> To: diy_efi at efi332.eng.ohio-state.edu
> Subject: Re: setting ignition curves without dyno
>
>
>
>
> Greg Hermann wrote:
>
> > >How about this idea..............actually build a dyno into
> your car.  A
> > >company called Land & Sea offer a product called "DYNOmite" which
> > >nonintrusively measures driveshaft torque and computes a host
> of parameters,
> > >including HP.    With such a product, every run on the street
> or track can
> > >be a dyno session.  I've been contemplating doing this to my
> project for
> > >awhile.
> > >
> > >Land & Sea is on the Web, and they are also at 1-603-329-5645.  I'd
> > >personally be interested in hearing from anyone who has tried
> this, or knows
> > >of anyone who has tried this.
> > >
> > >Thanks.
> > >
> > Not tried either it or the following described idea, but had been
> > contemplating doing as follows--mount a fore and aft oriented
> accelerometer
> > in the vehicle and include its output in a datalogging setup. A
> fuel used
> > pulse (or whatever sort of computed integration of fuel used)
> output from
> > the ecu could also be a very helpful thing to datalog in this regard.
> >
> > ---Greg
>
> You should be able to determine crankshaft acceleration from the
> crank sensor....
>
> Just more clutter for the programmer.....
>
> Regards  Tom
>