Hi. I recently got my car dynoed at a shop called rev-xtreme in sarasota florida. The shop owner couldnt figure out what broken red line on the air / fuel chart was. (the smaller one that is broken between about 3300 RPMs and 3500 RPMs) He said that my air / fuel was the green line. The only thing he said he thought it could be was that his Wide Band Harness got streched and broken, and he had to re-do the wiring to it while I was there. He thinks its interferance from the wiring in the cable. That doesnt sound right to me, canyou help me out with this?

PS. I cant wait to have you dyno tune my car. I only heard awesome things about you, and want somebody that actually knows their way around a mustang to work on it.

 

When I tune it I will put two widebands directly into each bank of the exhaust and properly measure a/f.

Your a/f actually looks to be way too lean for a blower car. It looks to be 13:1 if their wideband is working right, it should be 12:1 or richer at high RPM.

 

So the red line is my air fuel? or is it the green one? The shop owner was telling me that its the green one, and its off the charts rich.

 

The dashed red line is a reference line.

 

Not that one, the smaller one that is broken between about 3300 RPMs and 3500 RPMs The shop owner said that my air / fuel was the green line.

Studying the chart, now I realize that the red lines are my second run, and the green lines are my first run.

What happened was we ran the car on the stock procharger tune and for the first run which was the green lines. Then since we were so rich, he kept leaning out the fuel, which he ended up taking out 15%, which was as much as the tuner would let him, and got the red lines with the higher numbers. He however still thought that the green line was my air fuel line, which oviously the red line is the air fuel for that last run. wow, what a freaking idiot. He had NO IDEA what the red line was....

 

what kind of tune do u guys use ? im thinking about going to pick up a diablo tomorrow.