Do I have a bad wide band?

1328 Views 11 Replies 6 Participants Last post by five0three, Sep 23, 2013

five0three

Discussion Starter · Sep 22, 2013

Here is my log of a wide open pull.

https://docs.google.com/spreadsheet/ccc?key=0AigyOs5mkGORdGo0UGJ0aUU3bE9UNFpMeDd5NThQY2c&usp=sharing

here is a video of my wideband during this same pull (2500-4500)

https://www.youtube.com/watch?v=XkOT3n-z48g

sorry, cant get it to embed for some reason.

I would think with A/F's this high, i would be knocking and pulling timing like crazy

Car:
2013 STi 5 Door 4500 miles

Mods:

Killer B Holy header/up pipe (coated and wrapped)
Perrin turbo inlet
COBB sf intake with box
TGV Deletes
Invidia catless DP
SPT catback
DW 65c pump
protune

I set up a fuel pressure gauge and (although its a bit bouncy) it seems that my fuel pressure is where it needs to be. 43.5 @ idle with FPR vacuum line disco's and capped. 38ish at idle with FPR under vacuum. Rises 1:1 under boost as it should.

Ive done a boost leak check and a vacuum test. No leaks. car runs smooth. Im really scratching my head here. The car has been down for almost a month now because I dont want to run it with things being this lean. With the way this datalog looks, I would think that maybe my wideband is faulty. Any advice?

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1 - 12 of 12 Posts

hutch959

· #2 · Sep 23, 2013

uhhhhh,..,...
log isnt public. cant see it.

where is your wideband mounted?
if that is "real"... that is scary lean.

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S1ckWrx

· #3 · Sep 23, 2013

open log to public.. how far down is the bung for the wideband?

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CTSparky

· #4 · Sep 23, 2013

Do a search on you tube for aem wideband test. You will see a movie that shows how to test it.

sent from space.

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five0three

Discussion Starter · #5 · Sep 23, 2013

made public. The bung is about 4 inches from the turbo.

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five0three

Discussion Starter · #6 · Sep 23, 2013

Ill do that test tomorrow. Would my sensor being too close to the turbo cause a lean reading or the opposite?

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CTSparky

· #7 · Sep 23, 2013

The closer to the turbo the richer.

sent from space.

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five0three

Discussion Starter · #8 · Sep 23, 2013

Wouldnt i see knock learn and knock feedback in the log if things were actually that lean?

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Leftbehind126

· #9 · Sep 23, 2013

Have you checked to make sure none of the wires on the rear of the actual gauge have fallen out of their clips? I had the orange wire dislodge itself and it showed stupid lean numbers (16.0 and above). Took us 8 hours to finally trace it back to a loose (I think orange?) wire on the gauge. Pushed it back into place and it read normal.

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ImranM847

· #10 · Sep 23, 2013

Do a free air calibration then try it again. Chances are your O2 sensor is reading funky. It happens a lot more frequently when it's that close to the turbo, as it's exposed to high temps and possibly baked some carbon on there. Either way, from experience I can tell you they fall out of calibration pretty quick at 4inches. Recalibrate and if it gets better, consider moving it a little farther from the turbo. Hope this helps

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CTSparky

· #11 · Sep 23, 2013

ImranM847 said:
Do a free air calibration then try it again. Chances are your O2 sensor is reading funky. It happens a lot more frequently when it's that close to the turbo, as it's exposed to high temps and possibly baked some carbon on there. Either way, from experience I can tell you they fall out of calibration pretty quick at 4inches. Recalibrate and if it gets better, consider moving it a little farther from the turbo. Hope this helps

On an AEM there is no free air calibration.

Check the wires.. do the wideband test.

Here:

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five0three

Discussion Starter · #12 · Sep 23, 2013

what do you guys think of my datalog?

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