Ive searched and got mixed answers for what is considered a safe afr at WOT.

On a 3rd gear pull I'm at a steady 10.8 AFR at 25psi.

Is this too lean?

Previous owner said its been tuned at FFtec. Bought in Sacramento, car is in Vancouver, Canada now. I live near the border, so I still fill up with 92 octane in America that the previous owner said it was tuned on.


Mods are:

FP BLACK Ball Bearing Turbocharger
PPI ported exhaust manifold
3" Ported O2 housing
AMS Intercooler
Precision Injected 1000cc injectors
EXEDY Twin Disc Racing Clutch/Flywheel
Forced Performance Air Intake Pipe
Bloxs air intake filter
Beehive Valve springs
Aftermarket inter cooler out pipe
Full 3 inch exhaust from downpipe, test pipe to exhaust
Walbro fuel pump
ARP head studs
Auto Meter boost gauge and Innovate Wideband

Thanks for your help.

 

10.8 is more on the rich side. But how low does it go once it reaches full boost? And how does it taper at red line? Do you have an AFR log to show vs RPM and boost just for better verification?

Anyhow, 11.2-11.6 Is a better place to be during WOT, tapering to 11.2ish at red line is good.

 

Oh and what are you using to control boost?

 

I don't have a log, I'm just going by what the gauge says.
from what i can see, it stays at 10.8 above 4k rpm WOT.
It leans out jumping between low 11's and high 12's at half throttle in boost.
Idle is around 14-15

Not sure what im using to control boost, my guess would be its ECU controlled as i dont see a MBC or EBC anywhere
I guess i should get a cable to do some logging.

Thanks for the reply

 

Do yourself a favor and get it retuned, that will probably solve everything.

 

I'm heading down to English Racing for a tune after I put in cams, just wanted to make sure I'm safe driving with this tune for a couple weeks.

 

10.8 is a little rich but nothing dangerous

11.2-11.5 wot

12.-12.5 I like during spool

14.7-15 at idle

 

If I were you I would just not get on it until you get your re-tune

 

10.8 is fine and a little on the rich/safe side. you will be fine. a leaner afr will get you more power.

 

mine is 10.8@ WOT, been fine for a year now.

 

10.8 is rich. typically on pump gas at wot should be around 11.5. Rich is always better than lean so you should be ok.