Ouch. I hope it's not oil then.

Now, I am looking at your 4000 & 4500RPM on that same histogram, and you see how you transition into rich area in -6 to -8 psi. In my tune I am still at stoich in those areas and I only start to transition from 14.7 AFR to 13.2 AFR at from -4PSI to 0 PSI (NA WOT).

So can your tune be more efficient and use less gas? Absolutely. Could that be culprit? Very well could be.

What I CAN tell you is that I never smoke at 13.5 AFR so would be good to check O2 like you said just in case and chat with your tuner about maybe running a bit more efficiently at part throttle than you currently are.

EDIT: You see, if you can confirm that LAMBDA FB is ON and you loosen the tolerances to allow for it to take full control and all of a sudden you're no longer smoking at 4K RPM, that would be your smoking gun... if that makes sense. It's a good test.

 

Here is my revised target afr table. I have also given FB a little more room to do its thing. I also changed my o2 ground to a sensor ground instead of a chassis ground. Hopefully, this will make a difference. I really appreciate your help, my friend.

 

No problem. Just watch knock like a hawk as that's on a leaner side.

Because I am overly cautious I run 2 different O2s:
1. LSU 4.2 driven by AEM Infinity onboard WB controller - my LAMBDA FB
2. LSU 4.9 driven by X-Gauge WB controller then feeds info to the AEM Infinity via CAN (so there is no ground offsets to worry about)

Sounds like you are using analog 0-5V WB instead of CAN or Serial which do not deal with ground-offset issues.

You might have done this already if you also have a gauge, but simply make sure that your Gauge AFR is in line with what your ECU is receiving - if not, use sensor ground and check again. If doesn't fully solve the issue you can correct it manually in the ECU software, to make sure it's in-line with the gauge.

 

My o2 fb is only adding fuel for some reason. Isn’t the fb value supposed to be negative when it is taking away fuel? When the current afr is richer than the target it is still saying positive value on o2 fb.

 

I downloaded the software to take a look, hmmm, makes me wonder if yours is set to prevent it from reducing fuel, maybe tuner set it to 0%?

In screenshot below you can tell on included by AEM base map for SC AP1 it's limited to cutting 5.1% of fuel and no more.



UNLESS you are not actually looking at % values? Just double-check exactly what it is that the O2 FB window is displaying for a value. Maybe it's LAMBDA? Just a wild guess. I would need to see it to understand.

 

It was a stupid mistake. My lean limit value did not have a negative sign in front of it. So when the software was trying to lean it was actually richening. I still don’t know why it’s so rich still though. Even if the o2 says it is 14.8 at idle you can still clearly smell fuel.

 

I can confirm even at 14AFR, maybe even as low as 13.5AFR I can't really smell fuel unless I am obv behind the pipe, so I agree, maybe O2 is way off.

 

maybe I’ll just buy a shitty afr gauge off Amazon and see if it reads richer.

 

FWIW I have black soot on my rear bumper after a few drives but my cold starts definitely run rich and my afr's across the board are def a little on the rich side. I've been looking to make the jump from flashpro to Infinity so haven't put too much more effort into getting things perfect with flashpro. I guess my point is what exactly is "normal" is hard to say regarding the amount of black soot..?

 

it is so bad that I have to clean the stains off the bumper with a heavy duty degreaser after washing. Something is definitely wrong.