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Thanks, will get back to logging when I get back from vacation.

My car isn't track only. I am working on getting it to idle better and just better manners in different conditions.

It idles right now but fluctuates a bit. And it drives pretty good but I think...

Definitely an interesting discussion. I appreciate all the insight.

I am still processing everything that you wrote. But the gist of it that I understand is that on the 2009 G8, the downstream sensors do effect fuel trims while in closed loop?
My goal is to get...

I didn't realize that. So only monitor the cats?

Hello,

I am trying to get back into learning and tuning my Pontiac G8 better this summer. Last year I went from headers with no cats to Kooks with high flow cats. My current tune has the cats...

Awesome! Thanks for the help! I love learning this stuff.

I have seen that thread before but it was over my head. I now understand how the math and pids work so I should be able to figure it out. Only question would be do I just plot one of the math...

I was starting to wonder about it just not being as efficient in the lower rpm range too. How do you calculate the vve from dynamic airflow or maf? Sounds like that might be a quick way to get the...

Had a chance to go for a drive after disabling the STFT's and this is my EQ error now:
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Looks like I have some work to do. I may put the VVE back to stock and then start over from there.
...

Yep. Make sure you have the channels suggested at the beginning of this thread added to the scanner.

I will do it again after making changes to the tune to completely disable the O2 values.



I know it would be off. I just thought it would be off the other way. That I would be running more...

Can you post a log and your tune? I am still working on my own idle but can take a look.

Do you think even though I have the tune in Open Loop that changes are still being made from the STFT's? Should I max out the O2 Readiness ECT to disable STFT?

There is an initial log in the first post and here is another one.
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I also notice that the O2 sensors are reading but the Fuel System status is OL so it should be in Open Loop.

Here is...

Yes, but I am just trying to help so that you get more views. Do you know if the engine has the stock cam?

See that is what I thought also. That I would be more lean. I did what I considered a final VVE tune tonight with the following for my averages:
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I smoothed the graph a bit but didn't...

you will probably want to start a new thread.

I have been working on the tune on my car again with the WB sensor and went through the MAF and it was also pretty rich down low. After going through the MAF a bit it is definitely running better...

I have been using process monitor to figure out if it was having issues reading or writing files but I didn't find an issue yet. I did find that when vcm scanner opens it does not read the...

Yep. Everything is in there. It will keep the layout and the charts and graphs. Just not the correct channel list.

This is a generalized order to tune that I stole from another thread on here for my notes:


You can skip the first step if your injectors haven't been changed. Injector timing is complicated,...

That is quite the generalized question. Do you need help just getting it running? Or getting it to idle? Something else? Lots of people here can help with the right questions. I am still...

Probably something very easy that I am missing but how do I set the default channels that are in the scanner? Every time I open the scanner I have to open my saved channel list again. I have tried...

Do your custom headers have an O2 bung? You could put a wideband in there to start tuning. Only issue is you probably won't want to drive it around with open headers. Did that with my Mustang to...