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DIY software dynos - anyone use these?



Questions to answer...

Vehicle weight                  No problem there
Transmission gear ratios        Simple look up
Rear gear ratio                 ditto
Frontal area                    Hmmm, maybe a little harder
Drag coefficient                Let me crank up the wind tunnel
Tire diameter                   No problem
Tire pressure                   easy
Frictional loss of drivetrain   Uhhhhh,  3?

I guess if you get these right it might work.
Let us know  ;-)

-RGK-




At 05:10 PM 9/23/2003 -0700, Mark wrote:
>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
>
>
>
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