I had the car tuned with only the x pipe on and the AFR's were great at idle and cruising speeds, 14.7-15.5. I added the rest of the exhaust system and now it idles anywhere from 15-17 AFR and regular driving is 15-16 AFR. WOT is still 12-13 AFR. I'm not really comfortable with the light to mid throttle running that lean after just adding some mufflers. I went through and tightened every clamp on the system and no change. I know the cam is aggressive so its going to show leaner at idle, but this was kind of a dramatic change to both modes. Otherwise, the car acts fine. Should I worry? I don't want to take the car back to the shop for it to sit for two weeks & cost me $$$ for the tuner to revise the tune. I have a MPVI 2 and the drive to learn to do it myself.
Mods:
BTR Stage 4 N/A cam and springs
FAST 57lb Injectors
CAI
FTI 3x 3600 Stall
Walbro 450
Melling High Pressure Oil Pump
1-7/8 Long Tubes
Speed Engineering xpipe kit and catback system
AEM UEGO Wideband
I have uploaded my tune and I can't figure out what he used to tune, whether its open/closed loop tuning. All I want to do is add a little fuel to richen the AFR's slightly during idle and light to mild throttle. Where should I start? What is being used to tune? Thanks in advance!