Lenin, I think you have a problem. You are leaing out from around 5500 RPM up, which is a very dangerous thing. The injector duty cycle ramps up to 100%, then drops down - causing your AFR to go lean. That is something in the tune that needs fixed.

The fuel pressure graph doesn't show much detail, but it looks like your fuel pressure is dropping under WOT as well. What is the fuel pressure supposed to be on a C32 AMG? What does it read at idle? The AFR stays high even when the IDC starts climbing again which indicates the fuel pump is not keeping up also.

My recommendation is that you upgrade the fuel pump AND have the ECU retuned.

 

Matt, thanks for the advice. I have several different EC tunes available to me. I'm just waiting for the spring to get going again. The car has been in the garage all winter. The normal fuel pressure on a C32 is about 56PSI and that is what I usually see at idle.. On that cold January day it was reading 57PSI. It did drop to 50PSI under WOT. The fuel pump on a C32 is different from SLK32 and SRT6. I'm still trying to figure out the best way to raise the fuel pressure at WOT.

 

Update: The stock fuel injectors were not sufficient for the stacked 178 and 65 pulleys. I had to be out of town, but I gave IPS Motorsports (shop with dyno here in Ohio) the liberty to adjust the fuel pressure as needed and as directed by Eurocharged. They said they cranked it up until it was very rich down low but it was still running lean on the top end. They installed Bosch 550cc injectors and all is great now!

 

Did Eurocharged scale the injectors back in their tune to keep from running so rich on low RPM?