Wide Band turning help

Discussion in 'High Tech Retrofits' started by Cataldo, Jun 28, 2012.

  1. Cataldo

    Cataldo Veteran Member Lifetime Gold Member

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    So i got my exhaust done today and hooked up my wideband. (Its a Auto Meter Sport Comp analog fwiw). i was rich everywhere like low 12's So I fiddled with the Idle screws and now im averaging low 14's, right at 14.1 14.2 average but it ranges from 13.9-14.4. That was as lean as i could get it.

    Idling at 800rpm (Its a M-20 fwiw)
    its a vortec 350 with a very mild cam, just a step over stock (Its gonna hit the trash can here decently soon, the cam that is).

    the Carb:

    Holley 1850-4 with a secondary metering block. And when i pull it here in a few imma slap on the quick fuel adjustable secondary assembly. Im going to pull it apart and clean it out right quick as well. If i remember right i have 68's and 76's in it now, so Im thinking dropping the primary down to 64's and see where that takes me, i have several of each set of jets so Im going to really sit on this thing. Does that sound like a good jet change to start with?

    I might grab Chuck and have him hold a camera as i run it through the gears.
     
  2. Cataldo

    Cataldo Veteran Member Lifetime Gold Member

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    OK, soi tried the 64's and it leaned right up now it hovers 14.2-14.6 so thats perfect.

    but one thing i noticed is that is with the idleset at like 14.2-14.6 after say 30 sec or so it starts to climb lean, hovering in mid 15's. whats up with that???
     
  3. Cataldo

    Cataldo Veteran Member Lifetime Gold Member

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    check, with cruising at ~75mph what ever 2,500rpm in 4th with 3.23's is, its 12.0-12.4. when imon the gas a little, not opening the power valve, its 14.1-14.5 so thats great. when I am wide open imright back at 12ish.

    oh and now at idle my a/f ratio doesn't climb anymore, but it won't go over 14.0 all over the board the highest i can achieve now is about 13.8.
     
  4. LSXZ28

    LSXZ28 Veteran Member

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    I won't be any help - that carb doesn't have anywhere to hook up my laptop :crazy:
     
  5. Cataldo

    Cataldo Veteran Member Lifetime Gold Member

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    haha fair enough.

    driving it around some more its only really rich at real light throttle, basically just cracking open the throttle blades, when i have it opened up a bit more it goes to mid 13's, but when im maybe a little under 1/4 throttle its right at 14.2-14.4.
     
  6. andrew69_04

    andrew69_04 Veteran Member

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    sounds like your off to a good start!
     
  7. camarochevy1970

    camarochevy1970 Veteran Member

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    I wouldn't call mid 13's really rich. It is on the rich side, but 11's would be really rich

    That said, unfortunately I am no help for Carbs either, so hopefully someone smarter helps you out here.
     
  8. woody80z28

    woody80z28 Veteran Member Lifetime Gold Member

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    I've noticed with my Edelbrock at mid throttle the AFR is good, but at idle and slight throttle it's rich. Might be something with the cam...but I wonder if it's just a limitation of the carb itself.
     
  9. muscl car

    muscl car Veteran Member Lifetime Gold Member

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    we messed with the carbs adjustments (a/f screws) and even with 64 primary jetting which i believe is stock and it's still pig rich even after messing with the carb for a couple hours
     
  10. Todd80Z28

    Todd80Z28 Moderator Staff Member Lifetime Gold Member

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    You might try jetting down the primary side 1-2 sizes, but you might have to live with it as is. If carbs had uber-tight A/F control over the full range, the manufacturers would still be using them on new cars.:)
     

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