You know it has a high flow cat as I came over to help you put yours own, remember the little twist we had to do to get it in and out.
I assumed Dave looked at it when it was there in Colorado and knew what it was. But remembering it now who knows.
It would seem to me that when tuning you would want to know everything about the car. I had to fill out a bunch of paper work to get the Mallett tuned at CBM. They wanted to know everything about the car
I called and sent an email to Powell. No response as of this date. I don't really think that is the problem, but was willing to try it. I am not sure anymore, I think I have wasted enough money and time on this project, but do appreciate the info Elf.
I know my limits, and they were not what I have done. I expected it to be pretty much plug and play. I have a great mechanic, Robo is pretty bright guy that understands this stuff. Neither really have a clue of how to fix it, or by now I think it would have been. Why it is so random from one day to another really bugs me. Temps have been about the same, around 70 degrees. Low humidity. I am not a car mechanic, computer genious, but have common sense normally. This just has not made sense since day one.
We did find one entry online with the same problems, but no fix and no further postings.
Skersfan, when it comes to this stuff it's not an exact science. Some items you HAVE to know are on the car and some you don't. For instance, on my car when I went from stock injectors to 60# injectors, the tuner HAD to know that because there are tables in the tune that the ECM uses to calculate fueling and how the injectors flow is one of them. That table HAS to be changed. Your Cat, on the other hand, is not such an item. The data from the log as to how the air flows through the car is an effect of having a high flow cat. Now some things, like your turbo, don't have a specific table but a tuner should know about it since if he is expecting a stock turbo he may be surprised at the air flow numbers and wonder why they are so far out of spec for a stock turbo.
Remember, we are tuning. We call this tuning for a reason. Expecting us to know EXACTLY what needs to be changed or what is causing a certain problem is like expecting to pick up a guitar and start turning the tuning knobs and have the guitar play perfect immediately. What works for one car may not work on another.
Also, you have changed a lot with that larger turbo...not just adding it, but everything that was touched to put it on the car. Something is different than it was before and that's what we're looking for in that whole system. It's not simple.
Ideally, I would be closer and I could have the car for a few days, drive it, scan it when it acts up, and repeat. I'm driving my fiancÚ's car to work today because she is complaining of radio issues but if I'm not there and able to scan when the issues come up, I know nothing.
Here are some things I can tell you:
The P2187 code (pretty sure it's P2187...the last number is the only one I'm unsure of right now) Bank 1 Lean at Idle seems to be a downstream O2 code. While I've never seen it before, the LNF ECM is a bit different than what I'm use to. Dave Gilbert is the one who told me it's a downstream O2 Issue. What makes me comfortable with this is that I have gotten a similar code with my car. The difference is when MINE did it, the fuel trims were WAY positive. This means the ECM was adding a ton of fuel and the trims being that far off is what tripped the code. Once I got the fuel trims in order, the code didn't come back. YOUR fuel trims though are absolutely perfect. I've NEVER...not even on my Grand Prix which was tuned by a guy who wrote the programming on the ECM for GM...seen trims as good as yours. If the trims were +18 or higher, yea...totally would know why that code is being thrown...but they're not. Since the trims are the result of readings from the upstream O2...and the only sensors that tell the ECM whether or not the results of it's calculations are lean, rich, or right on are the O2 sensors, it stands to reason that a "Bank 1 lean at idle" code with a perfect set of fuel trims could only be caused by a reading at the down stream O2 sensor.
The soot is typical in a Direct Injected car. The back of Jamie's Veloster I'm driving today soots up CONSTANTLY and if you drive behind her when she gets on the gas hard, you can see the black smoke puff out of the tail pipes. In the Veloster world, this is totally common and accepted. In the Sky Redline / Solstice GXP world, no one has ever (that I've read...and maybe someone who sees this has experienced it) reported that this happens when you tune them for maximum performance. So part of me says "this is normal for DI" and part of me says "but I've never heard of it on this platform".
You can take it back to stock but considering we don't know what is directly causing these issues, you may make the matter worse or you may fix it and never know you fixed it.
Elff has a very valid point. Once you start down this road you don't have a car that is forgettably reliable as a stock OEM vehicle. Every tick, every rattle, every pop you're going to wonder if it is because you changed something. You're going to wonder if it is because something is going wrong. The last thing you usually chalk it up to is that "you changed the car, it's going to change it's everyday behavior" and that's okay because you're erring on the side of caution. However, when you change the car, you change the car and you may have new "traits" it didn't have before. Or it may not. Every car reacts differently to changes.
I can come out again and scan it as it is. We can scan it this weekend and see what it is doing. The scan may show why it's popping in the area it is or it may be something it learns out like the hard shifting when we first uploaded the tune. It may be learning into this behavior and the scan can show us what needs to be changed. Or it may not.
I'll be the first to tell you I'm no expert in all this but I also have done stuff like this for a while and have experienced what you're going through. I know how frustrated you are and believe me, the reason I am working so hard on this is I hate to see my friend not enjoy his car and be as frustrated as you are.