http://www.charm.net/~mchaney/roaddyno/dyno.htm#what

Anyone use it? Opinions?

 

Looks kinda sketchy :skep:

 

It looks like a reasonable device and an alternative to the accelerometer devices which measure ET & speed.

 

Where did you find the price? (I can't!) :confused:

 

I have used StreetDyno.
http://www.tweecer.com/StreetDyno/

It is free and does the same thing.
I had some problems with the program but it worked better if I cut the WAV file before and after the run, so only the actual acceleration was left.

I got these numbers using StreetDyno and then I did the plot in Excel:

 

Road Dyno price: $149 (includes shipping/handling)

Look under "Ordering Information!"
http://www.charm.net/~mchaney/roaddyno/

 

Not free anymore $50.

From the webpage>
Next you will need to build either an Inductive pickup [see Mike Chaney's "Home Dyno" page] or the voltage divider that I use to pickup the ignition signal.

Which did you use/build?

What did you use for recording, Pc sound card?


[Modified by tailgunner, 12:52 PM 2/10/2004]

 

My dad designed one about 10 years ago that does everything this one does; however, it actually calculates aerodynamic drag, drivetrain loss, and frictional (tire to road) loss. The one you mentioned here has you estimate those values to get hp and tq. Back when he was testing the software he gave a box to some pro drag racer, and the guy was really impressed with it.

Of course, family stuff (starting a new company, two kids going to college) got in the way and he wasn't really able to market and sell it. Again, this was long before the G-tech came out.

He's got three units built up that are probably stuffed in a closet somewhere. I need to drag those things out and try to hook them up to my vette.

 

I saw a software on TV, can't remember was it was called, but it was shown on Horse Power TV with those two gear heads on TNN... I'm sure some of you know what I'm talking about.

Anyway's, the guys pretty much just put in the size of the engine, number of cylinders, type of cam, type of intake, CR and it gave almost exact HP numbers.

Does any one know what this software is called and were can you get it?


[Modified by TheStef, 10:55 AM 2/10/2004]

 

The ones being talked about here will record the data needed to get the aerodynamic drag and rolling resistance. All it takes is enough knowledge to make a spread sheet to anylize data from coast down runs.

The math to separate rolling resistance form aerodynamic drag doesn't give real exact numbers, but the combined drag numbers it gives are very accurate. Just as accurate as the acceleration values that are recorded.

 

I only used the free pre 1.0 version that you can download.
I used a resistor divider ($1 in parts) and recorded using the microphone input on the laptop.


[Modified by JoBy, 9:39 PM 2/10/2004]