Wierd A/F reading, AEM wideband

[Dreamert]

We (me and my brother) just got around installing an AEM UEGO wideband on his JDM Silvia.

The readings that we have are weird ( to say the least). Being an SRT guy, they knock me off but we talked to a fellow SR20DET owner and he says they look normal.

Now, here is it. At WOT: around 13.2, at idle and cruise: over the AEM chart (more than 17).

Isnt that lean ?

The car pulls fine, doesnt hesitate...

I searched and found some possible options: exhaust leak (will have to check for that).

The car is running around 9psi of boost, no gas management, 3'' complete exhaust without cat.

It also runs a Blitz BOV vented to the atmosphere (moreover: the stock surge valve has been removed - all pipes are capped off).

Anybody can tell us if those readings are right ? If they are, is there any other wideband able to display them (since the AEM cannot show over 17, that is getting way annoying)...

[Dreamert]

Nobody is using the AEM Uego on an SR20DET ?

Nobody has an idea how to have it read the full A/F spectrum of that engine or which one to get to have that feature ?

[Jesse SR20]

Any exhaust leak before the wideband o2 will throw off the reading. So first off, check all flanges for leaks.

As far as what a/f should be, at wot your should be running 11.5 - 11.0:1. Some people tune to 12:1, but that's too risky to me. At idle, 14.7:1. At cruise, I'm still learning about that.

But you said he's not using any fuel management. I'm not sure what nissan uses for its stock a/f on the sr20. But there are quite a few things that can cause it to run lean.

dirty/clogged injectorskinked/leaking fuel linesworn out fuel pumppoor voltage to fuel pumpbad fuel pressure regulatorout of spec maf readings