I was going to go out and run my car a few more times this morning, but it flooded and I guess I should have the dealer look at it if anything is possibly wrong.

I've been tuning with a CZ over the last few weeks. I can get my WOT mixture right at 13.5 except for 5000 RPM-6500 RPM. In that range, I have the airflow pulled down 50% (max a CZ will do) and my AFR is still only up to about 12.0. It was 11.5 stock, so that 50% pull has only made a small bit of difference.

The CZ appears to be working. If I pull the 0% throttle, 4000 RPM point, the car stumbles at idle. The changes I make in the table seem to change the AFR outside of this band where the car seems crazy rich. I did have to lean everything from the CZ stage 2 map in order to get any RPM anywhere near 13.5.

Can anyone think of anything that would cause it to run this rich in just one area? All I can think of is the secondary or aux ports, but I'm no expert at the Renesis yet. Could it be the maf screens?

Since my car will be at the dealer anyway, it would be nice to get them to look at anything that might be wrong.

 

Nothing is wrong, it's most likely the ECU learning your fuel trims. What does your LTFT read?

Remember Maurice's foot notes...

 

0%. I haven't messed with anything below 5400 RPM, and all my other corrections are sticking.

I have literally done a run at 30% pull and then at 50% pull within a few minutes of one another and seen less than .5 change in my AFR in that mid band.

While tuning I have basically been driving like a normal person (under 4 K RPM, 30% throttle) except during the times I got WOT in 2nd gear. So the car isn't getting a chance to pick up LTFT from any RPM above 4K.

 

0% ?? How are you checking this?

 

An older version of Dan Harrison's CanScan.

Maybe I'm looking at the wrong number?

 

Your in Seattle, right?

 

Yep.