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Aircare + BOV to atmosphere = HIGH HYDROCARBONS : Solution ?

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  • Aircare + BOV to atmosphere = HIGH HYDROCARBONS : Solution ?



    everyone knows this scenario...

    I know it all too well,,



    Would the temporary soultion while being aircared , be nuetering the BOV's by pinching off the vacuum hoses to the BOV ??

  • #2
    It could work, but in the process it may raise your NOx emissions. Emissions are bad that way, reduce one raise another. This is only at BOV release, but aircare doesn't focus on readings during shifting, only at idle and 50-60km/h if i'm not mistaken.
    “Hey, come on, its a car right? No. It’s a symbol of your history, its a thread of continuity from which you came to where you are. It’s important that you don’t want to forget who you are.” -Dr.Phil in "Love the Beast"

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    • #3
      You can always remove it (them) for the test and then put it back in again. Lot's of people run without BOVs (me included) so it won't be an issue for some short term gain at AirCare time.


      Jon.
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      1990 GTR Drag Special T88H34D 11.24 @ 127.55mph at only 1.2bar...... officially. SOLD

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      • #4
        I'd remove atmo bov not just for aircare, but because it can make the car run like a turd if it has MAF's still.

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        • #5
          best to run recirc BOV w/ a draw-thru MAF


          If you have MAP or blow-thru MAF, atmospheric BOV is fine ( as long as the BOV is before the MAF)

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          • #6
            has anyone heard of this ,,, HKS EIDS,,
            seems like the answer to BOV to atm
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            or perhaps is there some sort of parm in powerFC that compensates for decel, and BOV affects?

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            • #7
              Sounds like a good thing to have.
              “Hey, come on, its a car right? No. It’s a symbol of your history, its a thread of continuity from which you came to where you are. It’s important that you don’t want to forget who you are.” -Dr.Phil in "Love the Beast"

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              • #8
                I'm not sure if atmospheric BOV is your problem, I have air cared my car with an atmospheric for the past 3 years and results are below.



                I always put the stock exhaust / cat in. During the tests they never activate the BOV since they shift at a lower rpm. They only test at a steady 50km/h and an idle test, both tests should not be releasing air.
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                • #9
                  Has anyone used the Apexi NEO,,
                  apparently there is a setting that compensates for the BOV Rich problem also..

                  oh yeah and on a r33 gtr you need two of the HKS EIDS,,, one for each MAF...

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                  • #10
                    With PowerFC, stock ECU you can play with decel settings. Stock ECU has a stop inject, inject, etc settings on decel which can be adjusted to suit when engine is cold, hot, etc.
                    Last edited by Skym; 07-06-2011, 04:03 PM.
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                    • #11
                      these decel settings you speak of....
                      they are in the POWER FC ???

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                      • #12
                        As far as I know there's a decel fuel setting that can be adjusted (maybe Japanese tuning software only?).

                        But it looks like you can't access it from hand controller -

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                        Doesn't seem to pop up in european? version of tuning software -

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                        • #13
                          I have hunted and search ... nothing...

                          the only thing that is somewhat close to decel settings is in the idle adjustment..

                          2 idle levels - one for no A/C electrical load and one for A/C electrical load..
                          2 F/C recovery levels - one for each of the above..., this setting tells the Power FC when to recover from Fuel Cutoff on decel,, so the highger the RPM the sooner it'll resume fuel delivery...

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                          • #14
                            to prevent stalling/rich conditions after shifting, you'd need to make the map temporarily lean for off-throttle.

                            I believe there was a guy making chips that did this which prevented BOV-stall.

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                            • #15
                              Who is this guy?

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