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Gr A. crank pulley (std. version)

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  • Gr A. crank pulley (std. version)

    see pics below,

    John





  • #2
    Thanks John! Now what did the crank sensor pick up? I don't see any teeth. Hmmm.....

    Cheers,
    Jake Larsen

    Comment


    • #3
      like I said, this is the standard gr A pulley, they dont
      have a trigger wheel pre installed.

      John

      Comment


      • #4
        Whoops, my bad. I hadn't seen the other thread where you were talking about the two different Motorsport pulleys. So will the 4 tooth pulley work with most modern day engine management set ups? I'm a bit naive to certain particulars, but a 4 tooth design seems too few for crank phase sensing.

        Cheers,
        Jake Larsen

        Comment


        • #5
          probably Jake. That is what the ECU4a uses, which is also
          old by todays standards. It still works very well though.
          The more teeth the more processing overhead, so perhaps they
          were restricted back then.

          If I were to use a 36-1 wheel, Id have it installed onto
          the back of the crank pulley. Having a trigger wheel that threads
          onto the back.

          Now I know Jake is going to be perceptive and have
          another comment concerning that last statement.

          John

          Comment


          • #6
            A 60-2 tooth wheel is what most modern EMS use if you are reving less than 16k rpm. That will yeild the highest resolution for RPM. For very high rpm motors, you can use 30-2. You really could use any configuration you wanted though if your EMS is able to specify the amount of teeth.

            There is no way you can measure RPM with just 4 teeth. There would not be enough resolution. That is probably for position, then rpm is measured elsewhere. On a 60-2 or 30-2 wheel the teeth are used for rpm then the point of the two missing teeth is to indicate position. That way crank position and speed are both determined by one sensor.

            That Grp. A crank pully is nice b/c it retains the rubber dampening. VAC Motorsports and Apex engineering make aftermarket crank pullies but I'd never use one without any kind of dampening (it seriously shortens main bearing life. Ask around in the Honda tuning community). Those multi groove belts are much less likely to throw too.
            Jeff J.
            1990 E30 M3

            Comment


            • #7
              Originally posted by John
              probably Jake. That is what the ECU4a uses, which is also
              old by todays standards. It still works very well though.
              The more teeth the more processing overhead, so perhaps they
              were restricted back then.

              If I were to use a 36-1 wheel, Id have it installed onto
              the back of the crank pulley. Having a trigger wheel that threads
              onto the back.

              Now I know Jake is going to be perceptive and have
              another comment concerning that last statement.

              John
              :p Ok, so what was I supposed to catch?

              Threaded trigger wheel? 36-1 wheel?

              Take care,
              Jake Larsen

              Comment


              • #8
                Great! Now all I need is all the other pulleys!!!

                Are there BMW Motorsports parts there to?

                Are they under-drive?

                What does a whole kit cost?

                Do not click
                At least it's German

                Comment


                • #9
                  Originally posted by EVOIIIM3
                  Great! Now all I need is all the other pulleys!!!

                  Are there BMW Motorsports parts there to?

                  Are they under-drive?

                  What does a whole kit cost?
                  You were ready to ditch the AC and Power steering about now, right Mike?

                  Andrew

                  Comment


                  • #10
                    yup he sure is

                    next week Ill go look for some electronic steering pumps
                    for you guys.

                    John

                    Comment


                    • #11
                      >>>You were ready to ditch the AC and Power steering about now, right Mike?<<<...>>>next week Ill go look for some electronic steering pumps<<<

                      You can also get electric AC compressors! Better have a good alternator and battery setup! I'd imaging the electric PS pump might use an accumulator to hold some pressurized fluid.

                      Stan

                      Comment


                      • #12
                        You think the electric PS pump from the Mini Cooper would work?

                        I'd bet the thing is F'ing expensive though.

                        Last edited by wookie1976; 12-27-2003, 07:35 AM.

                        Comment


                        • #13
                          we use the one from the A class MB. It will directly drive
                          the hydraulic M3 steering rack.

                          I can give part numbers if you want to source yourself.
                          Id prefer it actually.

                          John

                          Comment


                          • #14
                            Yea John post those numbers please!!
                            Ill check on it Monday.
                            Hows the mounting work out?

                            Comment


                            • #15
                              John, Do you have any pictures or descriptions of how this setup works? How big is it and where did it mount? Are there any special power requirements to drive the pump?
                              Jeff J.
                              1990 E30 M3

                              Comment

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