CyCloNe!

Hey guys finally got my wideband installed and i was wondering what air/fuel ratios i should see at cold idle, warm idle, normal acceleration and WOT?

Scott H

Cold idle will be a little rich, warm idle should dither right around 14.7, normal acceleration will vary based on load/RPM. WOT should be in the mid to high 11s.

CyCloNe!

Thank you sir, I'll check them today but I think that's about where I sit if I remember correctly.

ausgeflippt951

Ideal full-load AFR is considered to be around 11.7. At the track I'll see 11.3 when pushed hard. Idle cold will be around 12.5-13.5; normal operating temp will be around 14.7 (stoich); a hot car will get up as high as 16.

CyCloNe!

Normal idle is between 14.2-14.7
Cold Idle is 10-10.5 (I think my ISV is gone to crap)
Driving Normal is 13.5-14.2
Boost is 11.7-12

joker2cv

Should i see this numbers in a stock car too?

ausgeflippt951

Yes.

Cyclone, your cold idle definitely seems much too rich. You're sure the WB has had time to warm up? They typically won't read properly for a minute or so, until they warm up.

Rogue_Ant

These are very close to what it should be. It does appear that you are slightly rich. Try running in FQS pos #2 to pull out a little bit o fuel.

The cold-start will be rich, especially depending on the outside temperature.

9turbo51

If he is running high 11's to 12 under boost wouldn't reducing fuel by 3% make the car possibly a little lean.

Rogue_Ant

Depends on how much boost he is running... If he is running 15psi, then running into the low 12s shouldn't be a problem.

lart951

that's right but if you running above 18 psi is 11:3-11:7 max, if iam not mistaken right Josh?

Rogue_Ant

On pump gas - yes, the engine needs the extra cooling to keep knock away.

Seattle944

What wideband did you get? I run the same numbers.. Cold start is mid 10's and normal start is right around 15.

CyCloNe!

AEM UEGO, got it brand new $50 bucks lol, showed a little leg

CyCloNe!

Hey Josh would a bad ISV cause it to be a little richer? I usually have to give some throttle when cranking to get it to idle at first and the ARF's stay in the low 10's until it warms a bit (3min) then it goes to mid 10.5-10.9 and full warm is in the 14.5 range.

I run 17psi and it holds till redline in atleast the first 3 gears, hardly ever use fourth. I'm trying to get some stuff under control before I get her on the dyno. I emptied my aftermarket catch can today (it's line between AOS and MAF Tree), no oil came out only clear water (condensation).

I bought my tps and isv from work I'm defecting them out this week and getting new ones. That extra oil from my turbo I know made my tps act up. I put a restrictor in and now it seems way better, just giving a few days for some of the oil to clear out of the intake.