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Stage 2 COBB OTS Lean WOT

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Old Apr 24, 2018, 03:42 PM
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Stage 2 COBB OTS Lean WOT

Hello,

I've recently flashed to the stage 2 cobb off the shelf map and have been running lean under WOT. I have an innovate MTX-L Plus with the 02 sensor calibrated and under WOT, its reading from 12.6 to 13.2. I have not heard anyone else complain about the OTS maps so I am a bit baffled. I should also mention that cruising in the city/highway AFR's are 14.5-15.3 and under partial throttle, it is in the mid 13's. I was looking to get a protune at Buschur Racing (2 hrs away) but don't want to schedule that if there is a mechanical issue going on.

Details:
I've checked the FPR hose. It is zip tied tight.
I have the orange fuel pump relay (P/N 8627A049) (also tried switching relays around, didn't do anything)
I've done a boost leak test; no leaks
I've looked at the exhaust for leaks; none
I've tried running stage 2 93+CHFF and stage 1+CHFF LWG; both maps have the car running lean
There are no dangling vacuum lines or anything else that looks out of place

Mods:
Buschur crossflow CBE
MAP testpipe (this is where the A/F 02 sensor is)
Depo Racing turbo inlet pipe
Cobb high flow filter

Other Notes:
Boost was on target with the both maps (stage 1 was LWG)
The knock was a max of 2 under stage 2 WOT (has hit 8 twice during engine lugging scenarios, could be phantom knock?)
I can run a log just let me know what you'd like to see, I don't have the AFR reading on the accessport though

Thanks in advance. If you have questions, ill try to respond ASAP.
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Old May 3, 2018, 09:36 AM
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Originally Posted by GZQ 7883 View Post
Hello,

I've recently flashed to the stage 2 cobb off the shelf map and have been running lean under WOT. I have an innovate MTX-L Plus with the 02 sensor calibrated and under WOT, its reading from 12.6 to 13.2. I have not heard anyone else complain about the OTS maps so I am a bit baffled. I should also mention that cruising in the city/highway AFR's are 14.5-15.3 and under partial throttle, it is in the mid 13's. I was looking to get a protune at Buschur Racing (2 hrs away) but don't want to schedule that if there is a mechanical issue going on.

Details:
I've checked the FPR hose. It is zip tied tight.
I have the orange fuel pump relay (P/N 8627A049) (also tried switching relays around, didn't do anything)
I've done a boost leak test; no leaks
I've looked at the exhaust for leaks; none
I've tried running stage 2 93+CHFF and stage 1+CHFF LWG; both maps have the car running lean
There are no dangling vacuum lines or anything else that looks out of place

Mods:
Buschur crossflow CBE
MAP testpipe (this is where the A/F 02 sensor is)
Depo Racing turbo inlet pipe
Cobb high flow filter

Other Notes:
Boost was on target with the both maps (stage 1 was LWG)
The knock was a max of 2 under stage 2 WOT (has hit 8 twice during engine lugging scenarios, could be phantom knock?)
I can run a log just let me know what you'd like to see, I don't have the AFR reading on the accessport though

Thanks in advance. If you have questions, ill try to respond ASAP.

stock fuel pump?
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Old May 3, 2018, 09:36 AM
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OTS maps are not great BTW... lots of people have issues with them!
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Old May 3, 2018, 02:24 PM
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EVOX84,

I do still have the stock fuel pump. I have really weeded out every other possible problem except for it. I went ahead and bought a DW65C today. I wouldn't think the stock pump would go out at 43k miles but after reading a few other posts of people having very similar issues, they said a fuel pump fixed it. Also, I am going to be getting tuned in the next few weeks, so if i run more rich in the meantime, its not a huge issue.
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Old May 4, 2018, 05:29 AM
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Originally Posted by GZQ 7883 View Post
EVOX84,

I do still have the stock fuel pump. I have really weeded out every other possible problem except for it. I went ahead and bought a DW65C today. I wouldn't think the stock pump would go out at 43k miles but after reading a few other posts of people having very similar issues, they said a fuel pump fixed it. Also, I am going to be getting tuned in the next few weeks, so if i run more rich in the meantime, its not a huge issue.

The only other thing you can do is reach out to COBB. I was running a V3 with the OTS maps and had some issues with knock sum being random. not crazy like 7...... they looked at my logs, changed a few things and sent me a new map. this had some knock so b/c i live in Chicago they told me to get pro tuned b/c i couldn't bring the car to them. I hope it works out and you'll have to post some info after the pro tune!
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Old May 12, 2018, 11:25 AM
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Update: Installed the DW 65C fuel pump. It made it a tad more rich, but I'm still in the low 12's at WOT.
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