Thread: Good afr?

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  1. #1 Good afr? 
    Moderator dsmuts's Avatar
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    I just got a wideband and got it hooked up and I'm showing an afr of 10.5-10.8. That means i'm running rich right? I thought a good afr was around 11.2 or so but i really don't know. Mods in sig. Thanks.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  2. #2 Re: Good afr? 
    Poppin 'em thangs mechguy's Avatar
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    You are correct, that is if your engine can handle running leaner.
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  3. #3 Re: Good afr? 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Canned tunes tend to run rich.

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  4. #4 Re: Good afr? 
    Moderator dsmuts's Avatar
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    Cruising I'm around 14.5-15 ish. Would i be able to lean that out for better gas mileage?
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  5. #5 Re: Good afr? 
    Poppin 'em thangs mechguy's Avatar
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    Quote Originally Posted by Fivefingerdeathpunch View Post
    Canned tunes tend to run rich.

    IIRC you prefer the lowest of AFRs, yes?


    Quote Originally Posted by dsmuts View Post
    Cruising I'm around 14.5-15 ish. Would i be able to lean that out for better gas mileage?

    Its an age-old question. Search for "lean burn".
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  6. #6 Re: Good afr? 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    The lower the better.

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  7. #7 Re: Good afr? 
    Moderator dsmuts's Avatar
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    If I had an exhaust leak would that make me read leaner?
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  8. #8 Re: Good afr? 
    GXP Level Member Tuner-Extraordinaire's Avatar
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    Quote Originally Posted by dsmuts View Post
    I just got a wideband and got it hooked up and I'm showing an afr of 10.5-10.8. That means i'm running rich right? I thought a good afr was around 11.2 or so but i really don't know. Mods in sig. Thanks.
    yep rich
    Whine with your Cheese?
    Stock+Self Tuned. Going for low 14's everyday.
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  9. #9 Re: Good afr? 
    Moderator dsmuts's Avatar
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    What about if i have an exhaust leak? Would it read leaner than it was?
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  10. #10 Re: Good afr? 
    GXP Level Member Tuner-Extraordinaire's Avatar
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    depends where your wb02 is
    Whine with your Cheese?
    Stock+Self Tuned. Going for low 14's everyday.
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  11. #11 Re: Good afr? 
    Moderator dsmuts's Avatar
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    In the rear o2 spot on sd's I think I have a leak somewhere though. Good possiblity its the flex.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  12. #12 Re: Good afr? 
    GXP Level Member Tuner-Extraordinaire's Avatar
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    most likely yes.
    Whine with your Cheese?
    Stock+Self Tuned. Going for low 14's everyday.
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  13. #13 Re: Good afr? 
    Moderator dsmuts's Avatar
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    So i could be running even richer? That sucks.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  14. #14 Re: Good afr? 
    GXP Level Member Tuner-Extraordinaire's Avatar
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    possible.
    Whine with your Cheese?
    Stock+Self Tuned. Going for low 14's everyday.
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  15. #15 Re: Good afr? 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    To me thats way to far back. I have mine in the goose neck on the sd headers.

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  16. #16 Re: Good afr? 
    Moderator dsmuts's Avatar
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    Does it throw it that far off having it further back? Maybe I should weld an o2 bung on the crossover and put my o2 there and put my wb where the o2 goes?
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
    Reply With Quote  
     

  17. #17 Re: Good afr? 
    GXP Level Member Tuner-Extraordinaire's Avatar
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    Quote Originally Posted by dsmuts View Post
    Does it throw it that far off having it further back? Maybe I should weld an o2 bung on the crossover and put my o2 there and put my wb where the o2 goes?
    nbo2 from one bank of cylinders, smart.
    Whine with your Cheese?
    Stock+Self Tuned. Going for low 14's everyday.
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  18. #18 Re: Good afr? 
    Moderator dsmuts's Avatar
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    Dont some of the headers have the o2 in the crossover?
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  19. #19 Re: Good afr? 
    The mod from over yonder TheOtherNick's Avatar
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    Yeah, having the narrow band in the cross over is fine, as long as you are not tuning off it. Wbstore and zzp both do it, and I have modded some speed daddies to have it like that seams to work fine.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
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  20. #20 Re: Good afr? 
    GXP Level Member Tuner-Extraordinaire's Avatar
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    Quote Originally Posted by TheOtherNick View Post
    Yeah, having the narrow band in the cross over is fine, as long as you are not tuning off it. Wbstore and zzp both do it, and I have modded some speed daddies to have it like that seams to work fine.
    Just doesn't seem super smart to me. -- Unless you have a wideband operating full time at least, even then i think it hampers the car's ability to self correct fueling. Ideal would be to have b1s1 and b2s1 but GM was too cheap for that.
    Whine with your Cheese?
    Stock+Self Tuned. Going for low 14's everyday.
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