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running lean!!!

Discussion in 'Performance and Tuning' started by HOSS454, Feb 21, 2009.

  1. Feb 21, 2009 at 1:39 PM
    #1
    HOSS454

    HOSS454 [OP] Well-Known Member

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    hey guys,

    i have a 2008 taco v6. i got the urd intake, urd maf cal, doug thorley long tubes and a dynomax bolt on exhaust. i just installed my aem wideband gauge and when i am at idle, it says that it is about 18:1. i donʻt know where to start. any help would be greatly appreciated. mahalo
     
  2. Feb 21, 2009 at 1:59 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    I think 18:1 at idle is fine.
     
  3. Feb 21, 2009 at 2:05 PM
    #3
    HOSS454

    HOSS454 [OP] Well-Known Member

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    ok, thanks chris, i just took it for a run up the highway and at wot, it was about 13.3-13.5. not bad. thanks again chris.
     
  4. Feb 21, 2009 at 3:20 PM
    #4
    roxspin72

    roxspin72 Enjoying my addiction

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    Oh Yeah!!!
    When I was tuning my MAF Cali, it was at 14.7 with base map.

    When tuned, it stayed that way at idle, and would be 12.5 at WOT.
     
  5. Feb 21, 2009 at 3:20 PM
    #5
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    sounds about right. FWIW, my Wifes Honda runs close to 20:1 at idle.
     
  6. Feb 21, 2009 at 4:58 PM
    #6
    jaxchrisfla

    jaxchrisfla Well-Known Member

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    ditto what he said. 14.7 at idle, and no higher then 12.5 at WOT. In the 13s can burn up cats quick!!!
     
  7. Feb 21, 2009 at 5:44 PM
    #7
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    roxspin72 and jaxchrisfla have much more experiance tuning these new engines than I have, so I would listen to them. I dont think you would burn a cat with a 13.5:1 AF though. They can take ALOT of heat.
     
  8. Feb 21, 2009 at 6:53 PM
    #8
    XrunnIT

    XrunnIT Well-Known Member

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    That is too lean. A good idling vehicle will be between 14.6-15.1, anything higher then that is not good.

    Now in the case of the OP, you may want to make sure that your wideband is calibrated properly. The factory ECU operates in a closed loop mode at idle, and I've never heard of an issue like this (not that its not possible, just unlikely).

    While they can take a lot of heat, 13.5:1 at WOT will destroy a cat pretty quickly.

    For n/a 1GR motors that are running the front set of cats, they should be tuned to about 12:1 at WOT under full load to prevent burning up the cats. If they have removed/gutted the front cats they can get by with a 12.5 without any issues.
     
  9. Feb 21, 2009 at 7:05 PM
    #9
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Well, thats good info to know. I have always aimed for under 12 when boosted, but was always told that mid 13's is fine for an NA engine.
     
  10. Feb 21, 2009 at 9:00 PM
    #10
    roxspin72

    roxspin72 Enjoying my addiction

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    +1 on the recal of the wideband. First time I used my LM-2 I was getting some wierd readings. Was running way too rich. Well after recalibrating, it gave a more accurate reading, and tuning was a sinch from there.

    Good luck on this one. Also, not sure about Cats and all, but if you are looking for optimum performance, 13.5:1 @ WOT is too lean. Aim for the 12's.

    Are you tuning this, or or did you just slap it on. You might want to get in touch w/Gadget and see what he says. But like I said my AFR was straight at idle upon checking wideband with base map. setting the fuel trims in closed loop can be tricky, but WOT is a sinch.

    Keep us up to date on your progress.
     
  11. Feb 21, 2009 at 9:11 PM
    #11
    HOSS454

    HOSS454 [OP] Well-Known Member

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    i guess urd put in a map to match my set up. not too sure. i would really like to know why it is so lean. should i try to take out the maf cal?
     
  12. Feb 21, 2009 at 9:17 PM
    #12
    roxspin72

    roxspin72 Enjoying my addiction

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    If you can set all the Cells at 10, or make sure they are set that way from URD, which I believe the are, It's a neutral point. Soom if that still leaves you leaning out, then remove it and check AFR w/o cali.

    Process of elimination.
     
  13. Oct 14, 2009 at 2:21 AM
    #13
    importautopros

    importautopros Well-Known Member

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    13.5 will not burn any cats. if u put more fuel in it will cause a cat to work harder to clean the air up. which make 12:1 a\f more likely to burn up a cat faster but will take a long time to do that. for boosted engine 11:9 af is what u want to see and for allmotor 13.5 is where u will get the most power. i own a dyno so dont listen to that other guy. my truck is s/c running @ 11:9 a/f @ wot. my truck made 237hp with 271tq and runs great.
     
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