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Thread: Stupid question but I have to ask anyway

  1. #1
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    Question Stupid question but I have to ask anyway

    Commanded fuel when in open loop Normal (Cold Open Loop).

    When these values are DECREASED, will the mixture be leaned or richened up?

    Thanks!



    Christopher
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  2. #2
    Joe (Moderator) joecar's Avatar
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    Chris,

    If you're displaying that table in AFR units, then decreasing the values will richen the mixture.

    If you're displaying in EQ units, then increasing the values will richen the mixture (EQ = STOICH / AFR).

    Cheers
    Joe


    PS: it would be stupid to not ask a question and be forever wondering what the answer is, so please don't feel that it's a stupid question...

  3. #3
    EFILive Distributor dfe1's Avatar
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    If lost bolts were displayed in EQ units, would a higher value equal more lost bolts, or fewer?
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  4. #4
    EFILive Crew Site Admin Tordne's Avatar
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    Given that higher EQ Units makes you richer you could afford to buy more bolts
    Andrew
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  5. #5
    EFILive Distributor dfe1's Avatar
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    Quote Originally Posted by Tordne
    Given that higher EQ Units makes you richer you could afford to buy more bolts
    That being the case, if the EQ ratio for lost bolts were 1.14, the lost bolt count would be richer-- ie more lost bolts-- than if it were 1.00. On the other hand, if you were to measure lost bolts in lambda, 1.14 would represent a leaner count, or fewer lost bolts.

    The reason I posted the lost bolt question in the first place was to point out that a number, given without reference, is a source of confusion, not data. I think the different meaning of identical lambda and EQ values is a case in point. Both equate 1.0 with stoichiometry, (nominally 14.7:1 AFR) but values move in opposite directions to indicate richer or leaner air/fuel ratios. Many times, (as with some stand-alone control systems) numbers are stated without clear reference to either lambda or EQ. If you're not familiar with these measurement conventions, it's often difficult to make sense of things. A value of 1.14 can indicate an AFR richer or leaner than 14.7:1 depending on whether you're talking lambda or EQ ratio.
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  6. #6
    Joe (Moderator) joecar's Avatar
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    Very good point... any quantity must have some kind of units associated with it.

    Also note that an increase in lost bolts actually means you're missing bolts...

  7. #7
    Lifetime Member Biggsy's Avatar
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    Quote Originally Posted by joecar
    Very good point... any quantity must have some kind of units associated with it.

    Also note that an increase in lost bolts actually means you're missing bolts...
    But, YOU are in charge of lost bolts, therefor an increase of lost bolts means you gain more!
    Does that mean you are the one taking them??
    Dave.

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