LEO_06GT

Well atleast I tried.

Woops. I just forget that you got a tune since you don't have a CAI and the fact that you seem to be against doing peformance mods with your S-197.

EDIT***
My car was dynoed on a dynojet.

TacoBill

Yes, met up with JedCranium there (aka CPK Bill... sorry, those two names just seem to go together! ). He brought the Roush Stage 1 with him.. lookin' fine! He said he tried to talk you into going lastnight to the Meet.
I didn't bring my Stang, just dropped by to pick up some Adams spray for me and Leo and get some t-shirts.



Code?



It's a Dynojet.



I have to research what the deal is with 'actual' vs 'SAE corrected'? Do you know?

89Trooper

Code: Don't know yet.
actual vs SAE - have no idea what you are talking about.

TacoBill

My findings:

Un-Corrected vs. Corrected Horsepower & Torque
The dyno and its computer output the horsepower and torque numbers for your vehicle. There are really two sets of numbers, un-corrected and corrected. Each dyno is subjected to different atmospheric conditions. To facilitate comparison, the "standard" is Society of Automotive Engineers (SAE) standard J1349. The dyno results are "corrected" the this standard in order to accurately compare the "Numbers". Dyno numbers corrected to SAE J1349 alter the data to make it seem as if it was taken when the atmospheric pressure was 29.23 in/hg., the temperature 77°F and the humidity zero. Automatic measurement of the barometric pressure and ambient air temperature together with humidity measurement ensure repeatability between tests.
Always ask what correction factor was used to calculate the data when judging various performance products on the basis of dyno test results.



BOTTOM LINE:
If you want to know whether you are going to burn up the tranny with too much power on a cool, humid day, then go to the dyno and look at uncorrected power to see how exactly much power you have under these conditions.

But if you want to compare the effects due to modifications, or you want to compare several different cars at different times, then the corrected readings of the "standard" dyno will be more useful.

89Trooper

OK, so how do I correct mine for the following:

30.08" Hg, 91.06 degrees F, 34% humidity?

Correction Factor: SAE Smoothing: 0

TacoBill

I've read that you need your run file, then you can run it through the Dynojet program (can download it) to see the results from different corection factors.

But, since you don't have the file, maybe this will help?

The equation for the dyno correction factor given in SAE J1349 JUN90, converted to pressure in mb, is:



where: cf = the dyno correction factor
Pd = the pressure of the dry air, mb
Tc = ambient temperature, deg C
The pressure of the dry air Pd, is found by subtracting the vapor pressure Pv from the actual air pressure. For more information about pressures and calculation of the vapor pressure, see Air Density and Density Altitude.
The relative horsepower is simply the mathematical reciprocal of the correction factor.

89Trooper

I know the cf is 0, though.

TacoBill

You got me there...

At least you'll be more edumecated on your next trip to the dyno.

I'm having a crash course before Saturday!

LEO_06GT

WTF?

Bill-

TacoBill

Hey, I was only trying to speak Tom's language!

89Trooper

I downloaded the program from DynoJet. Justin (the dyno guy) gave me the run files and I fooled around a little bit with it and it's not even worth worrying about. I corrected up to a factor of 5 and it's miniscule.

HP went up a max of 2.

89Trooper

This made me happy! I finally figured out how to work the dyno program and the files that Justin gave me. Here is a picture of all 4 of my dyno runs:

http://i47.photobucket.com/albums/f1...angs/dynos.jpg

The clutch was definitely slipping at Fantasy of Flight, too!! It looks like right around 3000 RPM is when the clutch starts to go south.

Light Blue Line: Best power, least amount of slippage.

Red Line: Same power until the clutch really slipped around 4750 RPM. You can see that right when the clutch slipped more, the power dropped.

Green & Dark Blue Line: Much less power, much more slippage.

Orange Line: What the RPM-to-MPH line should look like.

Can't wait to see what I'll get when the clutch can handle the power!

TacoBill

How did you get the run files? Did you bring your memory stick along?

I'll be asking for my files as well so I can play around with the program.

Your results are similar to what I've read, just a small difference in HP.


On your graph, it's all over the place. Even between runs 2 & 3, where the MPH and torque is consistent, the HP isn't. Because of the clutch slippage?

TacoBill

Did you download the Winpep7 7.5.2 software?

I haven't yet, but is it user friendly?

89Trooper

How did you get the run files? Did you bring your memory stick along?
Justin emailed them to me.

On your graph, it's all over the place. Even between runs 2 & 3, where the MPH and torque is consistent, the HP isn't. Because of the clutch slippage?
I think so. The dyno only really measures torque. It then uses a formula to calculate HP. MPH and RPM are in that formula, so if they are screwed up, HP will be screwed up, too. To measure power you must already have an accurate measurement of work and the time required for the work to be performed.

89Trooper

Yes, that's where I got it. Once you understand how to change the graphs around it's easy. You have to click on the X and Y labels to change them. That's the part I finally figured out with Justin's help.

TacoBill

Well, hopefully I'll get a hold of my files and you can show me how to tinker with it.

TacoBill

Did you also have to download the RUN VIEWER/DEMO VERSION? Or just the Winpep7?

Are there any limitations on the demo (ie. limited number of access or exxpires in X number of days)?

89Trooper

The only thing I downloaded was the RUN VIEWER/DEMO VERSION.

Not sure about limitations.

Did you see my post above the one you quoted talking about the HP?

karman

Hey thanks for the update. I was still at 7.5.1