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CO to aim for?

Discussion in '308/328' started by Hans, May 13, 2012.

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  1. Hans

    Hans F1 Veteran

    Feb 17, 2006
    7,734
    Hilversum, Netherlands
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    Hans Teijgeler
    #1 Hans, May 13, 2012
    With the new exhaust headers came 8 ports to hook up a CO metering device. Another nice and old school method of tuning my carbs, which I plan on using.

    However - what CO value should I be aiming for, roughly? And at what RPM?

    Thanks!

    Hans
     
  2. Ferraripilot

    Ferraripilot F1 World Champ
    Owner Project Master

    May 10, 2006
    17,855
    Atlanta
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    John!
    #2 Ferraripilot, May 13, 2012
    3-4% at idle?
     
  3. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,828
    30°30'40" N 97°35'41" W (Texas)
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    Steve Magnusson
    #3 Steve Magnusson, May 13, 2012
    The 308GT4 WSM gives a little richer target of 4~4.5% at idle on page C21.
     
  4. GavC

    GavC Formula Junior

    May 9, 2004
    492
    Lincolnshire, Englan
    Full Name:
    Gavin Culshaw
    #4 GavC, May 13, 2012
    Mine has just passed it's annual MOT. On the test it registered 2.5% at idle which was a pass here. I did think it might have been slightly higher but happy with this as running very good at the moment
     
  5. Hans

    Hans F1 Veteran

    Feb 17, 2006
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    #5 Hans, May 14, 2012
    Ok, thanks. I'll give it a go today..
     
  6. Hans

    Hans F1 Veteran

    Feb 17, 2006
    7,734
    Hilversum, Netherlands
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    #6 Hans, May 15, 2012
    WOW.

    All CO screws were equally far out (about 3.5 turns). Most cylinders were ok-ish on CO - between 3 and 4%. But one resulted in 8.5% and one in 11.5%!! No wonder it stank like hell.

    Tuned all back to around 3% and she runs like crazy, and without the smell. And much smoother than before.

    If you have the CO ports on your exhaust headers, then hooking them up to a CO meter is HIGHLY recommended...
     

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