Anyone try to make a real power pid?

[Alvin]

Instead of using calculated torque and playing some math on it has anyone tried to find power and torque using the fundamental dv/dt?

I tried it in excel but all I'm getting a ton of noise from the slow frame rate, gear changes, and wheel spin.

[jimmyblue]

I think you'd be better off with an accelerometer
logged through the EIO. That, and a coast-down
curve that will show you your road and wind losses
which you can back-figure to a HP/MPH correction
curve. You can get eval boards for about $30 or
an old red-LED G-Tech will let you pigtail out an
acceleration voltage signal.

As a tune-to quantitative feedback, acceleration vs
MPH is about as good a "road dyno" as you could
want (wind speed variability aside).

[S2H]

I have one in the works.....just a few issues still....but I have the math part of it worked out and I know what is needed for it to work...

[JimMueller]

You can get eval boards for about $30 or an old red-LED G-Tech will let you pigtail out an acceleration voltage signal.

I have a Gtech which has the red display in front and has the 3-position sliding switch on the front. Is this the model you're referring to? If so, the case doesn't appear to have native provisions for a pigtail?

[MikeOD]

I'm curious about that as well...I've also got an old school G-Tech (had it for years now)...I don't see any way to pigtail out of it...but I also haven't tried to open it's case yet.

[S2H]

I've got a working excel sheet now...
now I just need to streamline a few things ... add an SAE correction option....
see if I can turn it into a program maybe using .net stuff

I need to get more data from some real dyno runs and some more .hpt files from thise dyno runs as well...
but its coming along and maybe sometime soon I'll be able to post it up

I'm getting into a point where my real job is very busy right now so I dont have time to work on this....but kow that I am working on it when I can...
it could be march before I'm even ready to post the excel sheet that I've been developing.......

[arthansen]

About 5 years ago I developed this spreadsheet. The first tab has instructions. I left in data from one of my "runs" to show what it looks like. This was my V6 Firebird and it dynoed at 322 RWHP(Cam, Headers, 100 Shot Nitrous). The run I am showing showed 309 RWHP.



http://web.tampabay.rr.com/jakerace/HPCalc.xls

Check it out.