Callaway on the dyno again today.....

[SurfnSun]

Well I spent a good portion of my day today down at Norris Motorsports. Frustrating.

There isn't really much good to report.

We ran the car and tried to adjust the Microfueler. No luck.

I told Mike about my conversation with Sam, and we put a vacuum gauge on it. It wasn't holding vac. There is a weird conglomeration of brass T's in the vacuum line off of the plenum. We pulled that mess off and simplified it a bit and attatched new vac line. Put the gauge back on it, and it held pretty well, there a very very minimal leak down. Ran the car again, it got better. There is still two spots where the A/F spikes lean and causes a serious studder in power. I can't remember if the last run was made with the "fat" chip or not.

Another disappointment was my #s. Mike must have been thinking crank tq when he gave me my rwtq number. It wasn't 550 It was around 490rwtq. which would give me 555tq at the crank. Though when this issue gets straight is should be over 500rwtq. Hp was just a few below 400, and will exceed that when the lean out is solved. However, the car was so hot you could cook a 5 course meal on the intercoolers. I could feel the heat from 12 ft away, that probably hurt my numbers a bit.

Anyway thats my day. It was cool to see my car again, and hear the turbos spool up on the dyno. I just wish we could get it fixed.

Thanks again Sam.

 

[8388]

Josh, another note to consider. When the car gets hot, the ecm will lean the mixture up a bit, just as it adds more fuel when cold.
They need to make sure this was not the case. The sensors at work here are the water temp. sensor and the manifold temp sensor. A simple scan with a Diacom will let you know.

Good luck !
-SAM-

 

[SurfnSun]

Yea Sam, Mike told me that but he doesn't have the scan tool yet. He said someone had located one for him but hadn't said when it would be delivered.

 

[8388]

What was the A/F ratio this time ? and at what rpm did you guys see the spike ?

Is there any way you can post it. I would like to see how it looks across the entire rpm range.

 

[8388]

*Sometimes* spikes in fuel mixture and timing can show up on a graph, when the ecm receives a signal from a sensor. This happens because of the time involved from when the sensor sends the info, the ecm reacts then corrects. It all happens very fast, but it can be seen as a spike on a graph. This is one of the reasons I use racing fuel. The higher octane serves as insurance under boost, when conditions are present that are out of your control.

 

[90Callaway]

To Sam's point you're wasting your time without a scan tool. How do they tune cars on the dyno and burn chips without a scan tool? It's not magic, it's science and without data they have no basis for troubleshooting or making custom proms. I really don't get it. They are just taking shots in the dark.

 

[SurfnSun]

I'll see if I can get mike to send me a .jpg of one of my 18 dyno runs!

 

[SurfnSun]

this is kind of what it looks like....I drew it in paint. Im a freakin artist! :L :L :L

 

[EricVonHa]

When they have the actual graph displayed on their computer all they have to do is "right click" on the screen and select "Export". Then they can save it as a .bmp or .jpeg. Otherwise you'll end up with a dynojet file that can only be viewed using their "Viewer" program.

 

[SurfnSun]

yea, I just called, they are going to give Mike a message to email me one