normal afr?

[zigspeed10]

I know the answer is here but I couldn't find it in my search. I have a wideband o2 and at about 5000 rpm and above my afr's go to 10.1-10.2 and I've seen it hit 9.9. This seems rich to me. Normal cruising afr's are 14.7-14.8, Cruising Vf is mostly at 2.75V. Only mods are 3in. turbo back and bosch bov. My question is are these normal afr's? or do I have a problem somewhere. Thanks

 

[clifftrail]

Look normal from your description.

 

[IwantMKIII]

you want to be around 12 at this point depending on throttle position

 

[zigspeed10]

maybe my question should be what afr's will a stock car see at WOT and higher rpm. I just want to make sure I don't have any boost leaks, or sensor, or injector problems causing my car to run rich. Thanks

 

[s383mmber1]

Does this help ya?

http://www.supramania.com/forums/showpost.php?p=155961&postcount=19

 

[isnms]

here is some more info to read up on
http://www.supramania.com/forums/showthread.php?p=159348&post159348

edit: and what clifftrail said.

 

[rumptis]

That all sounds about normal. The stock setup runs rich...which is safe.

No problem that I see, don't worry about it.

 

[zigspeed10]

Thanks for all the replies. Time to shop for a boost controller and fuel management. Thanks

 

[suprafanatic]

i thought 10's and 9's were on the leaner side?

 

[thechori]

i think 9-10 would be on the rich side, 18 is very lean IIRC

 

[Slow_Sc3]

i thought 10's and 9's were on the leaner side?

you sir are wrong

i think 9-10 would be on the rich side, 18 is very lean IIRC

correct

your cruising A/F is perfect but you can take some fuel out at that 5000rpm point you want to be closer to 11.8-12.0ish

 

[rumptis]

Higher Number = Leaner

Lower Number = Richer