DIY software dynos - anyone use these?

[rocco_crossing at hotmail.com (Rhett Farnum)]

I have Desktop Dyno 2000. I like it. I have a few things to learn about 
engines before I really know how to run it but for the most part its pretty 
simple.



Peace Out,
Rhett
Rocco_crossing
'83 Rocco (autocross ready, tune up, install harness, and finally I may get 
to makeing it look better!!)





>From: "Dan Bubb" <jdbubb@ix.netcom.com>
>To: "Mark" <mardak@cogeco.ca>,<scirocco-l@scirocco.org>
>Subject: Re: DIY software dynos - anyone use these?
>Date: Tue, 23 Sep 2003 17:31:33 -0400
>
>I've got a Roaddyno.
>It's OK for comparitive readings, but it's very sensitive to elevation
>changes in the road and also to windy conditions.
>Also, you will get quite different output depending on the gear you run in
>even though you enter the gear ratio for calculation. Apparently, the
>program doesn't take into account "geared rotational inertia" i.e. anything
>that's geared up through the gearbox. And, quite frankly, there's no way to
>assume or calculate a number for this inertia, so it's simply left out.
>Bottom line?
>You have to run the same piece of road, on a no wind day, with similar
>ambient conditions in the same gear to get decent repeatability.
>And, you have to not shoot your mouth off on the numbers you get since the
>correction factors for power loss to correlate to an actual dyno run are so
>high you'd be laughed off the list!
>I hardly ever use it, although now that you bring it up, it would be good 
>to
>show the shape of the power curve if you ran it on a flat piece of road.
>Nice toy though!
>Dan
>
>----- Original Message -----
>From: Mark <mardak@cogeco.ca>
>To: <scirocco-l@scirocco.org>
>Sent: Tuesday, September 23, 2003 8:10 PM
>Subject: DIY software dynos - anyone use these?
>
>
> > I've been looking at StreetDyno <http://www.tweecer.com/StreetDyno/,
> > and RoadDyno <http://www.charm.net/~mchaney/roaddyno/>, and it's DIY
> > brother,
> > HomeDyno <http://www.charm.net/~mchaney/homedyno/homedyno.htm>
> >
> > Cool concept using WAV sound files created using inductive pickups 
>(timing
> > light pickup), and then computing torque to get hp numbers (by counting
> > spark pulses of an acceleration run through the rpm range with car data
> > including weight, gear ratios, etc.)  Basically measuring the 
>acceleration
> > of the car rather than a drum on a standard dyno...
> >
> > Anyone use these?  Comments?
> >
> > I downloaded the StreetDyno prerelease software, and I'm getting some
>weird
> > results using the provided config and wav files so I don't know if I
>should
> > shell out the $50 to buy it...
> >
> > A nicer/cleaner version using real-time datalogging straight to a laptop
> > would be cool though - rather than record WAV files, load them into the
> > computer and then analyze them...  Seems a little mickey mouse...
> >
> > Any better solutions out there?
> >
> > Thanks!
> >
> > Mark.
> > 80 S
> > 81 S  ABA/JH/4K
> >
> >
> >
> > _______________________________________________
> > Scirocco-l mailing list
> > Scirocco-l@scirocco.org
> > http://neubayern.net/mailman/listinfo/scirocco-l
>
>
>
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