misfire issues on boost and solutions.

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

    #16
    cheers VAS.

    so you have 3.14@14v and 2@6v. is that correct. i want 2 bar boost too

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

      #17
      yup, that is right!

      with the high output coils marc said that the dwell can go even higher

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

        #18
        ill give it a go. off to dig out a laptop from the shelf.

        Comment

        • repo
          S2Forum Maniac
          • Dec 2004
          • 893
          • Country: Finland

          #19
          You can use dwells up to 5ms continuously with HO coils. Just beware that the vems software saying 5ms does not actually mean it really is 5ms, and with 6ish ms continuosly will cause the coil to overheat, especially on higher speeds where the revs are up.

          To check this You should have a GOOD scope in the outputs and check the various load levels and revs to see how the dwell time actually lives. Usually the number is more accurate on higher revs than on low. Explanation to this is a bit complicated, and a bit over my head, but new generation 16 and 32 bit ecus have internal clocks, whereas oldskool 8 bit ones don't, so they need to calculate the time from rpm signals.

          Actually the spark energy with the 034 HO coils rises all the way up to 9 ms, but I would't use that high as it most likely will overheat the system in no time.

          2.5-3ms is ok with 1.8T units.

          e: to answer the question, what is Your plug gap? IK27's have like 0,9mm originally, some sets have had 1.1mm, which is really too much, especially for 1.8T/original coils on high torque setups.
          Everything less than 2 bar is considered to be naturally aspirated

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

            #20
            thanks repo. i got ik24. gonna fit some standard plugs later too. i had some bk7re in before the gap looks bigger on the bk7re to the ik24. i like to test things. see how they fair.

            ill go with a slightly higher dwell then change the plugs tonight and hope for the best.

            ill update after lunch

            Comment

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

              #21
              the bosch ones have 0.6mm checked recently which is ok.

              Comment

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

                #22
                the ik 24 states 0.4. whether that is true???

                not had a chance to alter settings yet as laptop battery was dead.

                Comment

                • Jamo
                  Retired OG Mod
                  • Mar 2004
                  • 21750
                  • Country: United Kingdom

                  #23
                  Originally posted by A80Avant
                  yup, that is right!

                  with the high output coils marc said that the dwell can go even higher
                  I'm about to buy Marcs High Output coil what dwell can be used in VEMS?

                  Comment

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

                    #24
                    as repo said, up to 5ms if needed....

                    ask marc if he can make a better price if all three of us buy em. me you and Gary!

                    hey marc! give us a discount!

                    Comment

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

                      #25
                      I run the 034MS HO coils, IK27 and VEMS. My dwell settings are:

                      3.07ms @14V
                      2.00ms @6V

                      No problems with 2.1-2.2 bar boost

                      Comment

                      • Jamo
                        Retired OG Mod
                        • Mar 2004
                        • 21750
                        • Country: United Kingdom

                        #26
                        Originally posted by Bram
                        I run the 034MS HO coils, IK27 and VEMS. My dwell settings are:

                        3.07ms @14V
                        2.00ms @6V

                        No problems with 2.1-2.2 bar boost
                        Lol you beat me to asking you on MSN

                        Comment

                        • EspenW
                          S2Forum Extremist
                          • Apr 2007
                          • 1534
                          • Country: Norway

                          #27
                          The stock F5DPOR has 0.6mm gap, and you can't adjust the gap on those.
                          I'm running the colder F3CS plugs that are 0.6mm out of the box, but I need to gap them to 0.5mm in order to prevent misfires. That is at 2.1 bar peak boost with stock coils (93K miles). E85 is harder to ignite too, since AFR is much richer.
                          1995 RS2 on Alcohol (6.8sec 100-200km/h)
                          1994 80E Avant
                          1986 2L Golf 2 on Alcohol

                          Comment

                          • Jamo
                            Retired OG Mod
                            • Mar 2004
                            • 21750
                            • Country: United Kingdom

                            #28
                            Originally posted by A80Avant
                            as repo said, up to 5ms if needed....

                            ask marc if he can make a better price if all three of us buy em. me you and Gary!

                            hey marc! give us a discount!
                            You better ask quick cause I'm buying them very very soon!

                            Comment

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

                              #29
                              well im asking but we need a reply!!!!

                              I gary genually interested?

                              Comment

                              • repo
                                S2Forum Maniac
                                • Dec 2004
                                • 893
                                • Country: Finland

                                #30
                                Sorry, gotta delineate, I did not realize Marc has own HO coils, I was talking about 034 ones.
                                Everything less than 2 bar is considered to be naturally aspirated

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