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Old 02-20-2011, 11:56 PM   #1
devildog12390
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Default Lean at WOT

2002 WRX.

Mods: APS cold air, PE1818 turbo, Sti pinks, Sti TMIC, Perrin turbo inlet, TurboXS TBE, HKS up-pipe, Cobb AP (protuned at 263whp).

Got protuned about 4 months ago. Noticed my AFR's have been going lean (12.5-13.0) in WOT. I was tuned at 10.3-10.8. Haven't changed anything mechanically. Changed my oil/oil filter last week.

No CEL, no hesitation, no knock.

Any ideas?
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Old 02-21-2011, 12:09 AM   #2
newtothescene
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Did yo CALL YOUR TUNER?
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Old 02-21-2011, 12:15 AM   #3
urban_outback
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yeahhhhh ask the tuner there homeslice. i go 12-13 at wot
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Old 02-21-2011, 02:51 PM   #4
devildog12390
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Ideed I did CALL MY TUNER.

He said check my plugs, maybe gap them a little more, I'm gonna try that tonight and if it works, case closed. If not guess I'll be callin him up again.

It runs fine like I said, I've just always been told 12-13 is way lean at WOT. Especially considering my tune was set at 10.3-10.8.
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Old 02-21-2011, 04:51 PM   #5
Haelan
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Ever change your fuel filter? Does the fuel pump sound normal when priming?
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Old 02-21-2011, 08:31 PM   #6
devildog12390
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fuel pump sounds fine, I'll check my fuel filter first thing in the morning because I haven't changed it since I've had the car and that's been 10k miles...

thanks!
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Old 02-21-2011, 08:40 PM   #7
JdMS13
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How long has it been since it's been lean? I'm probably wrong but since it's colder now than when you got your tune, I guess in the summer?, that there is more air in cold air since it's denser than warm so that would make it lean? That's what I was told about my tune and that I need one (a new map) for colder weather so my boost doesnt spike and overboost.... it sounds fishy but who knows? I have an aftermarket ebcs so maybe that's it.
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Old 02-21-2011, 09:05 PM   #8
neo277
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How did you know it was going lean?
what are you using to log?
is it going lean throughout the power band or in the higher rpm's?
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Old 02-22-2011, 12:56 AM   #9
pnuts1986
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Do you have a airfuel gauge?

look at your fuel trims, at wot and idle.

also watch your maf, should be around 2 grams at idle and 200 at wot anything different isnt right.
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Old 02-22-2011, 10:22 AM   #10
devildog12390
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I been going off my AEM wideband as far as the AFR's go.

Once I start hitting boost (5psi) it starts to richen up but once it gets to 12.5-13.0 it stays in that range throughout the entire poswerband.

I'll check out my fuel trims and maf. Cleaning air filter/replacing fuel filter today. Thanks for the help gents.
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Old 02-22-2011, 01:47 PM   #11
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Try cleaning the MAF. STI pinks on PE1818 is not alot of headroom. Check your fuel pressure as well.
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Old 02-22-2011, 01:48 PM   #12
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Quote:
Originally Posted by urban_outback View Post
yeahhhhh ask the tuner there homeslice. i go 12-13 at wot
Then you have an issue.
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Old 02-22-2011, 02:40 PM   #13
devildog12390
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That's what I was thinking too... it seems like I just cleaned my MAF a couple months ago.

So I guess it's possibly time to get some bigger fuel injectors or go down to a 16g huh? TBH the 1818 is just too much for what I use it for...

Quote:
Originally Posted by quazimoto View Post
Try cleaning the MAF. STI pinks on PE1818 is not alot of headroom. Check your fuel pressure as well.
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Old 02-22-2011, 09:01 PM   #14
pnuts1986
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How do you know ur wideband isnt giving false info?

only way to tell is look at you o2 sensor voltage .9 is rich .1 is lean.

it would be pretty random to just need bigger injectors.....something isnt right....


or have someone spray carb spray into the air filter and watch your wideband to make sure that it's working ok. They dont last forever......
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Old 02-22-2011, 11:09 PM   #15
340Duster
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Check for turbo inlet or even your filter for a leak, either can throw the MAF off and make you run lean.
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Old 02-23-2011, 10:47 AM   #16
WhiteBgeye02
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well from normal conditions i have seen the compensation when it goes from a summer temp of say 65 to a winter temp of 25 actually richen up the mixture about .6-.8 points depending on the temps it was originallly tuned at. this is because from the normal compensations numbers from subaru they over compensate. probably to keep the car safe in winter from said boost spikes or overboosting.

the cooler air and running out of fuel is most likely your problem. and or the fuel pump is running out?? didnt see it or u didnt mention what fuel pump you had.

i also want to note that the wideband could need to be recalibrated or if you are running it off the stock wires spliced in it is innacurate down low in the desired afr of 11.2:1. Its onlly accurate at the factory spec of 14.7:1 for cruising because it is cheap and calibarted from subaru to be accurate at that range for fuel mileage and basic applications.

just another side thought i came up with while in the shower.

Last edited by WhiteBgeye02; 02-23-2011 at 11:23 AM.
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Old 02-23-2011, 04:56 PM   #17
devildog12390
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Haven't had a chance to check my fuel filter or air filter yet but I'm going to try to tonight.

I appreciate all the suggestions guys, I might be getting a bad reading but my AEM is only 2 months old, maybe I just need to clean the sensor a little. I'll try to check everything tonight and I'll return with my findings!
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