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Old 02-24-2013, 07:17 PM   #1
bigmike25rs
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Member#: 83924
Join Date: Mar 2005
Chapter/Region: MWSOC
Location: Avon Lake, OH
Vehicle:
2005 HTA 86 STi
10.66 @ 136 mph

Default lean under boost

Ive searched and read about twenty threads titled the same as mine, tried everything that fixed various cars and still I have this issue.. So....
2002 WRX
stock motor
stock turbo
Up pipe
TBE
COBB AP
Innovate WB02
I picked this car up bone stock from my dealership needing alot of work (oil leaks, CEL on, clutch slipping) Basically fixed everything on the car including a new front A/F sensor for the CEL, Fuel filter, installed a catless DP and wideband and did a few pulls. AFR's are spot on at idle and cruising, but stay in the mid to high 12's under boost. I got the AP about a week later, installed it and tried again. Same AFR's. I put the car away for the winter and started piecing together an 18G setup for the spring. I had a Walbro 255 sitting around for the build, so I threw that in yesterday and still the same results. Ive replaced the vacuum line to regulator and also cleaned the MAF two seperate times. Still the same. Ive inspected all the lines/hoses and everything looks ok. Turbo inlet hose is in good shape. Im thinking it could possibly be the regulator, Ive just never seen one go bad on a Subaru. Other than my wideband reading lean under boost, the car runs and drives fine. It definately makes some pinging noises at higher RPM's during my test pulls under boost so Im sure the WBO2 is reading accurately. Anyone have any trouble with our FPR's? What is the fuel pressure supposed to be under boost? Im assuming idle pressure should be around 40 or so psi and testing fuel pressure is the next thing on the list. After that, Im out of ideas. Any other suggestions? Thanks.
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Old 02-24-2013, 07:33 PM   #2
Turd Nugget
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Join Date: Feb 2013
Location: Southeast WI
Vehicle:
2013 STi Wagon
Satin White Pearl

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Have you looked closely at the spark plugs? Do they all look similar and do they have a nice light brown color to the ceramic? I dont know what these cars are supposed to be at as far as AFR's under boost but mid 12's doesnt seem to me like it could be too lean. I have tuned 100's of boosted honda's and I am quite conservative and shoot for 11.8-12.0, 12.5 should not even be much of a problem as long as the ignition advance is not too agressive. I have a 400+whp D16 in my own honda and sit right at about 12.0:1 throughout boost and am pretty agressive on the timing with it. Are you sure you are hearing pinging? I would like to know what other factory AFR's are. I have a PLX-M300 I use for tuning, I plan on sticking it on my 02 WRX its bone stock and i'll get back to the thread when that happens.
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Old 02-24-2013, 08:04 PM   #3
bigmike25rs
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Join Date: Mar 2005
Chapter/Region: MWSOC
Location: Avon Lake, OH
Vehicle:
2005 HTA 86 STi
10.66 @ 136 mph

Default

Im planning to pull the plugs and do a compression check before I put the turbo and injectors in. I need to make sure no damage has occured since the car is running the way it is. Im curious as to what they will look like. As far as the pinging, im not 100% positive that's what it is, but it sounds like a buzz or a rattle under boost. Everything I've read tells me that's detonation.
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Old 02-25-2013, 08:59 AM   #4
shamrock 05
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Location: *outskirts of motor city*
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2004 "Bugeye" WRX
WRB

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AFR's from what I understand....(im stg 2)

sitting idle 14.7-15.5
partial throttle 14.7 ish
wot 11.2 and it should stay there....on colder mornings I have even hit 10.8 at wot


while driving and letting off the throttle......car leans out (I heard its supposed to do this, but I dont know why and I get a
--- reading)

Last edited by shamrock 05; 02-25-2013 at 09:56 AM.
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Old 02-25-2013, 09:40 AM   #5
jayman4312
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Location: Chicago, IL
Vehicle:
2004 wrx
black, stage 2+

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my stage 2 AFR's

idle 15.2-15.9ish
part throttle 15.1ish
WOT 11.9-12.1ish

93 octane open source tune
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Old 02-25-2013, 11:19 AM   #6
bigmike25rs
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Member#: 83924
Join Date: Mar 2005
Chapter/Region: MWSOC
Location: Avon Lake, OH
Vehicle:
2005 HTA 86 STi
10.66 @ 136 mph

Default

Quote:
Originally Posted by shamrock 05 View Post
AFR's from what I understand....(im stg 2)

sitting idle 14.7-15.5
partial throttle 14.7 ish
wot 11.2 and it should stay there....on colder mornings I have even hit 10.8 at wot


while driving and letting off the throttle......car leans out (I heard its supposed to do this, but I dont know why and I get a
--- reading)
This is what im expecting to see. That's right where my HTA86 STi would run @ 28psi on 93 octane. I wasn't sure if a stage 2 WRX could run slightly leaner, but this seems excessive.
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Old 02-25-2013, 03:14 PM   #7
shamrock 05
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Join Date: Jul 2006
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Location: *outskirts of motor city*
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2004 "Bugeye" WRX
WRB

Default

Quote:
Originally Posted by bigmike25rs View Post
This is what im expecting to see. That's right where my HTA86 STi would run @ 28psi on 93 octane. I wasn't sure if a stage 2 WRX could run slightly leaner, but this seems excessive.
Are you saying my numbers seem excessive?


And when you go wot...the car should dip into the rich side and stay there.

I met a guy once and his car (total piece of junk) told me he was tuned and when he went WOT his AFR gauge would read 16.x.......and he was trying to convince me that his numbers were good. So I was like OK, turned around and walked away
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Old 02-25-2013, 03:16 PM   #8
bigmike25rs
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Member#: 83924
Join Date: Mar 2005
Chapter/Region: MWSOC
Location: Avon Lake, OH
Vehicle:
2005 HTA 86 STi
10.66 @ 136 mph

Default

Quote:
Originally Posted by shamrock 05 View Post
Are you saying my numbers seem excessive?


And when you go wot...the car should dip into the rich side and stay there.

I met a guy once and his car (total piece of junk) told me he was tuned and when he went WOT his AFR gauge would read 16.x.......and he was trying to convince me that his numbers were good. So I was like OK, turned around and walked away
No. Your numbers are what I expect to see. The 12.9 AFR's im getting under boost is what im referring to as excessive.
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Old 02-27-2013, 09:51 PM   #9
bigmike25rs
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Member#: 83924
Join Date: Mar 2005
Chapter/Region: MWSOC
Location: Avon Lake, OH
Vehicle:
2005 HTA 86 STi
10.66 @ 136 mph

Default

Figured it out today. Brought home a fuel pressure gauge and a spare MAF I had laying around at work. First pull the fuel pressure looked good.. Second pull I watched the wideband and sure enough, AFR's in the mid low 11's... MAF sensor fixed it. Tried cleaning the old MAF two separate times with no luck.. Replaced it all together and problem solved.
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