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Old 11-25-2007, 02:02 PM   #1
Scooby Newbie
Member#: 103209
Join Date: Dec 2005
Location: Greenville, SC
02 STI'd Wagon

Default AEM wideband reading lean???

Hey there, I bought a wagon with a decent build. It was tuned on an open ecu, and I'm a bit concerned. It has an aem wide band and gauge mounted right on the steering column. I watch it probably too much. Full boost 19psi it's target ratio is 11.4:1 and it hits it (though I swear I'm hearing a bit of det when it hits full boost, then it goes away, but I can't tell if its det or wastegate flutter), little to no load cruising it's jumping around from 15.0-15.3:1. Being concerned I pulled a plug, and sure enough, it is very white/gray. I have an appointment at Topspeed on the 5th to get the car tuned. but I am concerned that I am doing damage to the car, and I really like the car and want to take care of it. The bottom end is a fresh sti bottom end with less than 3k miles, so I'm hoping that it hasn't been damaged. So will cruising two hours to atlanta at 15.3:1 going to hurt it or am I ok?
Thanks in advance for your help.

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Old 11-25-2007, 02:15 PM   #2
Benchmark Tuning
Former Vendor
Member#: 154444
Join Date: Jul 2007
Chapter/Region: MWSOC
Location: 9120 Medill Ave
2008 08 STi, Typhoon
06 STi, 847-960-8676


Well i would recommend having someone take a look at your map and some logs, odds are your maf scaling or something is off thats leading to this problem at cruise/idle, thats causing that. I personally wouldnt like to see that on my WB. Its close enough to 14.7 that it shouldnt do any damage (this is my opinion you can make your own judgements), especially at cruise, my only concern would be that if it is too lean anywhere else in the map that could lead to major damage.
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Old 11-26-2007, 01:14 PM   #3
Scooby Specialist
Member#: 103320
Join Date: Dec 2005
Location: Oklahoma City
1998 swapped
Forester L


Like 555 said, if you've got a screwy MAF table, your trims could be very off, causing the car to run lean in open loop (WOT etc) as well. This corroborates your lean cruise conditions.

Try logging the car and see what your ST/LT trims are.
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Old 11-26-2007, 01:48 PM   #4
Scooby Newbie
Member#: 122603
Join Date: Aug 2006

15:1 wont be a problem at all on cruise or closed loop. Some great tuners target leaner than that (step forward Ken)

Again 11.4:1 shouldnt be an issue but the det could be - get it checked out or make some det cans to check whether it actually is det.
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