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Old 04-15-2010, 12:06 AM   #1
rhurley13
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Join Date: Apr 2010
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Vehicle:
2004 STi

Default Cobb Stage 2 Lean

I just flashed my ecu to the Stage 2 93 oct map. Went out for the test drive and I can hear detonation. I turned logging on and gave it a few more runs to gather data and it seems as though my AFR is way lean. I was hitting target boost levels of ~17.5 (17.86 at the highest), but the AFR was in the mid 14's! Seeing as how this is super dangerous, I uninstalled the Cobb tune and am back to the stock map. Has anyone experienced a similar issue?

I did some more testing with different maps, such as the stage 2 91 oct and took out 3 degrees of timing. With this configuration, I had the least amount of pinging but it was definitely still present. Unfortunately I did not have the logging on for that run, so I don't know where my numbers were at exactly.

My thoughts right now are to replace to fuel filter and possibly the fuel pump. Anything else I should be considering??
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Old 04-18-2010, 03:37 AM   #2
Sokkarr
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Default

Quote:
Originally Posted by rhurley13 View Post
I just flashed my ecu to the Stage 2 93 oct map. Went out for the test drive and I can hear detonation. I turned logging on and gave it a few more runs to gather data and it seems as though my AFR is way lean. I was hitting target boost levels of ~17.5 (17.86 at the highest), but the AFR was in the mid 14's! Seeing as how this is super dangerous, I uninstalled the Cobb tune and am back to the stock map. Has anyone experienced a similar issue?

I did some more testing with different maps, such as the stage 2 91 oct and took out 3 degrees of timing. With this configuration, I had the least amount of pinging but it was definitely still present. Unfortunately I did not have the logging on for that run, so I don't know where my numbers were at exactly.

My thoughts right now are to replace to fuel filter and possibly the fuel pump. Anything else I should be considering??
Did you get a tank of bad gas?
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Old 04-18-2010, 03:52 AM   #3
kh15
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thats more than bad gas! you need to try and do some logging
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Old 04-21-2010, 11:05 AM   #4
riderome
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OBP

Default Re: Cobb Stage 2 Lean

I get mid 10-15s as well on a stage 2 map. the afr logger might be off because I do get the occasional black smoke and backfire.
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Old 04-21-2010, 03:29 PM   #5
PERRIN_Chris
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Default

Remember that the AFR readings from the AccessPORT aren't very accurate, since it's reading from the rear O2 sensor. That means that it'll read after any cats if you have any, plus the sensor is a narrow band. To accurately read AFRs, you will need a wideband O2 sensor. Do you have the stock intake?
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Old 04-21-2010, 04:25 PM   #6
riderome
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For me I have a cat and it is stock 02 sensor so that is probably why.
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Old 04-22-2010, 07:32 PM   #7
arghx7
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let me guess, you used an OTS map on an aftermarket intake, which is exactly what Cobb says not to do.
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