Dino gt4 loves cold air! | FerrariChat
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Dino gt4 loves cold air!

Discussion in 'Technical Q&A' started by blainewest, Oct 30, 2006.

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  1. blainewest

    blainewest Formula Junior

    Aug 26, 2005
    729
    Kelowna, BC
    Full Name:
    Blaine W
    #1 blainewest, Oct 30, 2006
    I drove my gt4 today and it's the first time I had it out in cold air temps since I had the carbs synched/adjusted in late June (after Electromotive XDI install). The air temp today was around mid to high 30s. Prior to today there has been an intermittant off idle hesitation when starting in 1st gear...well holy cow...today.. no hesitation, more peppy, smoother, she seemed more...eager.

    Does this mean that my carbs were set to rich in warm weather? Are the carbs/system so sensitive that from 88 to 38 degrees ambient temp there is that much difference in performance? Anyone else experience this?
     
  2. Ken

    Ken F1 World Champ

    Oct 19, 2001
    16,078
    Arlington Heights IL
    Full Name:
    Kenneth
    #2 Ken, Oct 31, 2006
    All carb cars like cold weather; mine does too. Something to do with air density I think.

    You need to tune your car when the engine is at running temperature; air temp isn't important (unless you're racing) but altitude is. If your car runs right when the engine is all warmed up, you're good to go!

    Ken
     
  3. 78-308gt4

    78-308gt4 Formula Junior

    May 22, 2005
    735
    Memphis, TN
    #3 78-308gt4, Oct 31, 2006
    I've noticed it with any fuel injected car I've driven in both temps as well. Ken is right, it has to do with oxygen density , think along the same lines as intercoolers and boosted engines.
     
  4. blainewest

    blainewest Formula Junior

    Aug 26, 2005
    729
    Kelowna, BC
    Full Name:
    Blaine W
    #4 blainewest, Oct 31, 2006
    Ok you guys are right, I think, but then isn't it true that if cold air is more dense (more oxygen per measure of volume) in cold weather I'm getting more oxygen. This would mean, would it not, that I was running to rich in warm weather at my present carb settings.
     
  5. Ken

    Ken F1 World Champ

    Oct 19, 2001
    16,078
    Arlington Heights IL
    Full Name:
    Kenneth
    #5 Ken, Nov 1, 2006
    No. Cold air is like adding extra O2. If you set the car up for this condition, it will run lean when everything warms up.

    Ken
     
  6. ggjjr

    ggjjr Formula Junior

    Nov 11, 2003
    929
    Detroit
    Full Name:
    George
    #6 ggjjr, Nov 1, 2006
    Ken, I think you have it backwards.
     

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