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AFR Problem??
AFR Problem??
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Old 07-14-18, 12:14 PM   #1
Garmacg
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Default AFR Problem??

The Car: subaru legacy b4 be5
The Engine: Suabru Wrx STI ver5 jap import 2.0L
Mods:
-Upgraded ignition from b4
-MAF delete
-MAP Sensor
-Heat exchange sensor
-Cone Filter
-Straight pipe decat exhaust
-Syvecs s6 pnp ecu
-Equal length headers
-Aftermarket downpipe
-1 after turbo (upper downpipe) wideband lambda sensor.


Issue im having is seen in with the Lambda Reading...
The AFR seems to go eeextremely lean but during this lean period the car seems to fuel fine with no knock and no crazy over fueling, full boost, responsive etc.


I'm wondering if any one can make more sesne of the problem is it possibley a leak around the turbo area? I also today heard a noise when letting off boost similar to a kind of chattering noise quite faint, but reminisent of the sound i heard when my turbo to intercooler pipe was loosely connected. I'm wondering am i right to think this is a leak near the turbo possibly in the downpipe to turbo gasket? hence the lean AFR reading? any input appriciated.


FYI: got the car mapped around 2 years back and is running 310 on a dynapack dyno, soon after getting it back my manifold needed replacing and needless to say i replaced alot of other stuff too and only getting it ready for road now and noticed this issue. still not crazy familar with the syvecs software so have uploaded a photo.


as its an on road map its done over time with a seperate graph for rpm rather than run along the rpm.

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Old 07-14-18, 12:15 PM   #2
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Default Re: AFR Problem??

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