Hey all. I've got an issue I'm hoping someone can help me with. I have a 2013 Corvette with the LS7 in it. It was perfectly running before with a Mamba intake, Fast 102 intake (stock throttle body) and Kooks longtube and catless 3" midpipe. I since added a relatively mild cam (cam card attached), the necessary supporting springs/retainers, and a Nick Williams 102mm throttle body. Since then, I can hardly keep this thing running. It's running stock cam gears and I have verified the timing and have pictures to prove it's spot on. I measured pushrod length with the EO/IC method and they were really just a wee bit longer over stock which I can believe due to the mild nature of this cam. I'm ruling out most of the mechanics of the install and am now leaning more towards the tune.
Here's what I did. I am shooting for a MAF only tune at this point, but I followed the E38 tuning guide to disable DFCO, and closed loop O2 control. The car would start, and idle (kind of), but when I blipped the throttle, the tone would change to indicate it was clearly cutting cylinders, it would stumble and then die. What I found is that it was pretty consistently flooding out cylinders 3, 5, 7 and 4. I tried pulling out a bunch of fuel from the MAF table but that didn't help too much.
Then, I turned back on the STFT and LTFT adjustments and noticed something I believe is a bit weird...but that's why I'm asking. Right away, it looks like it is trying to pull fuel from bank 1...which I assume to correct the reason plugs 3, 5, and 7 were wet. And it's looking like it is adding fuel to bank 2. Log attached. The car is stationary, idling, and the areas where I apply throttle is a slight roll-on, hold, and release. I checked the intake for leaks, but everything looks and seems tight. No whistling, odd noises, or anything.
Let me know if this looks "normal" for an idle condition. What strikes me as odd perhaps is that between the banks, there is at times a 15-20% difference in fueling. I had read that you can't believe trims at idle and they really only apply when driving, but that's just what I read. The issue I'm facing is that if I need a big reduction in fuel at one bank versus the other, how do I ever accurately do open loop MAF tuning?
Any help or thoughts would be appreciated guys.
Thanks!
LTFT look off??
LOG FILE:
trims.efi
CAM CARD: