VEMS high AFR on idle

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  • max_s2
    S2Forum Addict
    • Mar 2006
    • 498
    • Country: Latvia

    #31
    I run Lukas injectors (440cc@3bar, 505cc@4bar). If I have stock FPR (it says 4bar) then I have to calculate my req_fuel from 440cc or 505cc?
    As I understand, FPR makes 4bar fuel pressure all the time to injectors. Is this correct? I've never clearly understood the whole FPR thing

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    • GazzaG60
      S2Forum Freak
      • Mar 2007
      • 4133
      • Country: United Kingdom

      #32
      the way it works is its 4 bar static.

      so with no pressure applied 4 bar.

      when you run the car at idle its less than 4 bar due to vac and when on boost its 4 bar + boost.

      we used to change the factory 3 bar subaru ones using a airline with a guage to 3.5bar and crushing the fpr. same on any of the old style ones.

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      • Bram
        S2Forum Fiend
        • Aug 2006
        • 2582
        • Country: Netherlands

        #33
        With a live- Skype call in the car I got help from Marc on trying some things out.

        I have adjusted my req_fuel setting to 4.9 instead of 3.8
        What we suspect is that my FPR is not running on 4 bar anymore, so I might need to replace it with a fresh one.

        I tried to run the engine constantly on 1000 rpm, 2000 rpm and 3000 rpm when standing still and all gave me Lambda 1.0
        For now I will stick with Marc's provided VE table and start driving around town to do some lambda reading

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        • A80Avant
          S2Forum Obsessed
          • Sep 2005
          • 10873
          • Country: Greece

          #34
          Bram, i have to tell you, dont mind about the idle so much at the moment. Get it to run decently with ignition timing based idle control and deal with it later.
          try and build/tune the VE tables up to 130kpa and up to 5000rpm or so for now and then you will see how things are going.

          I have to say, the idle VE values are strongly related to the spark and ISV values. So changing one, will mess up the other. it needs time.I have managed to reach my goal after loooooooong efforts.

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          • A80Avant
            S2Forum Obsessed
            • Sep 2005
            • 10873
            • Country: Greece

            #35
            i have msn/skype if you need any help

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