16.2 AFR at WOT, 14.6 at idle, increase spark plug gap or increase FPR by 1 bar?

[4A Play]

I have reached out to the tuner of my big turbo stage 3 1.8t, but while I wait for a response I was trying to figure out this issue on my own. This is my first turbo car after a multitude of 2.8s. Currently running Simmons 630cc injectors and a garrett at 15psi, my aem wideband is telling me that at idle I am seeing 14.6 and 16.2 at WOT with a urotuning stage 3 big turbo map.

While the car sits in the garage is there anything I can do in the meantime IE: check the fuel filter? Check LPM of the injectors?

Greatly appreciate the help guys!

[dhicks7806]

Where did you place the wideband sensor at in your downpipe? Placement in the exhaust stream will drastically affect the readings


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[dhicks7806]

I would lean towards your sensor giving you a false reading before worrying about anything else. Typically the generic tunes companies provide are made on the rich side for safety. AFR that lean will grenade your setup. Make sure the wideband sensor is 12-18" from the turbo and also that it has nothing obstructing the flow of exhaust coming into it. (Common mistake is to place the bung directly behind the upstream O2 sensor which causes turbulence prevents the wideband from getting an accurate reading)


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[dhicks7806]

Sorry, I didn't realize how old this post was...I didn't even scroll down that far in the sub forum...this place must not too active...


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