14.0/14.2/14.4 AFR at Part Throttle

[Gr8Speed]

Alright not really sure where to post this since I'm not sure if the issue is going to end up being mechanical or map related. But I'm running Cobb OTS Stage 2 with a 3" intake. I installed the intake and a downpipe at the same time. I scaled the MAF table values to accommodate for the intake and after driving for about 20-30 miles the AFR starts to taper down to near 14.0-14.2 and stays there. I also get rich shifts of anywhere between 12.8-13.6, but then spikes back up to the normal 29. At WOT it's like 9.9 usually, nowhere near target. I've started troubleshooting the issue and have come up with a number of possible culprits. My trims aren't really that far off. Not perfect, but I think +/-6 was the highest I was seeing for LTFT. I'm going to run through all of these things tonight and am wondering if anyone has anything to add to the list.

1. I can see a small exhaust leak coming off the turbo/DP connection. There was a small crack in the weld that I fixed with some Quiksteel until next week because nobody can weld stainless here except a few people and they're busy until then, but I can still see a little bit of smoke rise when I rev with the hood open really aggressively.

2. The downpipe has 2 Primary O2 bungs. Is it possible I have the O2 in the wrong one? Gen One which should it be? (DP is eBay M2)

3. Shift Control Tables gone goofy?

4. It's a gen one, so I don't think this is it but the extended bung for the Secondary O2. Will that possibly cause this?

Thanks guys.

[Uranium9v]

check that secondary o2 bung you aren't using! they can loosen or even lose the plug and it will cause chaos.

[Gr8Speed]

Originally Posted by Uranium9v check that secondary o2 bung you aren't using! they can loosen or even lose the plug and it will cause chaos.

Didn't even think of that. Will do. You know which primary bung to use? I'm using the one that's kinda on the top.


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[Dimenus]

Log?

9.9 at WOT screams boost leak to me. Probably hot side of the IC?

[Gr8Speed]

Originally Posted by Dimenus Log? 9.9 at WOT screams boost leak to me. Probably hot side of the IC?

Will post a log this afternoon. No boost leaks though. First thing I checked.


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[Dimenus]

Originally Posted by Gr8Speed Will post a log this afternoon. No boost leaks though. First thing I checked. Sent from my iPhone using Tapatalk

Also, always take logs with TCS/DSC completely off. SWAS is a bitch (and will throw your AFRs off).

[Gr8Speed]

Originally Posted by Dimenus Also, always take logs with TCS/DSC completely off. SWAS is a bitch (and will throw your AFRs off).

SWAS is gone lol. Fuck traction control.

[Gr8Speed]

Got some logs. 28 and 29 are just driving. 30 is for an MAF cal.

I also have a video uploading of what I think may be the sound of the exhaust leak.

I also have ruled out that it was tune related. Rob, who is tuning me, sent me over a map with everything set right and it's still being goofy. I am not getting any KR (.7 at times).

[Gr8Speed]

I think since I have determined that it is not tune related I am going to move this thread.

[rfinkle2]

Originally Posted by Gr8Speed I think since I have determined that it is not tune related I am going to move this thread.

It also looks as if you have some funky trim action. Some of your problem is the leak @ the weld.

[BrandonRKD]

Originally Posted by Gr8Speed I think since I have determined that it is not tune related I am going to move this thread.

Ever find out your problem?

[Gr8Speed]

Originally Posted by BrandonRKD Ever find out your problem?

Yup. Ended up being a massive exhaust leak between the 1st and 2nd O2s.