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Idle AFR reading (stock)

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    Idle AFR reading (stock)

    Would a 14.17 - 14.34 be good for stock from factory reading on idle?

    If the above range is perfect, what would be the best idle setting within that range, for a completely stock using non-ethanol gas; 14.17, 14.21, 14.23, 14.28, 14.34? If so, why?
    Last edited by IS300E30; 02-08-2025, 05:56 PM.

    #2
    0.85 lambda is as rich as yo want to idle. Otherwise your plugs will be charred

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      #3
      closed loop narrow band should idle around 14.5+/- for the cat

      89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

      new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

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        #4
        Low 14s will often idle better but for catalyst efficiency and because of how the narrowband works it'll target stoich.
        Originally posted by priapism
        My girl don't know shit, but she bakes a mean cupcake.
        Originally posted by shameson
        Usually it's best not to know how much money you have into your e30

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          #5
          Per the Bentley book, the CO% should be between 0.4-0.8%, which would equate (per attached screenshot table) to 14.17 - 14.34 AFR.

          Am I missing something?
          Attached Files

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            #6
            Idle Mixture | Road Tuning Online Course | Level up your skills today

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