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    M42 & Knock Sensors

    My car has the engine out of a '93 318is. It's fitted with the knock sensors, but it's still using the stock wiring harness. What can I do to get the knock sensors functioning? I'm pretty sure I'd need a '93 wiring harness, but would I need anything else?

    The reason being that someone is selling a DASC, and I'd need the knock sensors to be able to use it :twisted:

    #2
    Re: M42 & Knock Sensors

    Originally posted by cgregory
    My car has the engine out of a '93 318is. It's fitted with the knock sensors, but it's still using the stock wiring harness. What can I do to get the knock sensors functioning? I'm pretty sure I'd need a '93 wiring harness, but would I need anything else?

    The reason being that someone is selling a DASC, and I'd need the knock sensors to be able to use it :twisted:
    I'm just going to say that I hate you. That's exactly what I'm going to do with mine.
    The BMW 318 is back. With a vengeance.

    Comment


      #3
      You'd need the complete Motronic and wiring setup from an E36 318.
      Adam Fogg- '88 M3

      Common sense- It's the new 'gifted'

      Comment


        #4
        Re: M42 & Knock Sensors

        So I'd need the wiring harness and the ECU and I'd be set?


        Originally posted by hamann318is
        I'm just going to say that I hate you. That's exactly what I'm going to do with mine.
        You really can't beat the combo of > M50 power with M42 weight :D

        Comment


          #5
          Re: M42 & Knock Sensors

          Originally posted by cgregory
          So I'd need the wiring harness and the ECU and I'd be set?


          Originally posted by hamann318is
          I'm just going to say that I hate you. That's exactly what I'm going to do with mine.
          You really can't beat the combo of > M50 power with M42 weight :D
          And all the sensors of course. it's doable, but the amount of wiring involved could be a pain in the ass.
          Adam Fogg- '88 M3

          Common sense- It's the new 'gifted'

          Comment


            #6
            which brings us back to the old question regarding necessity of knock sensors. People have been boosting knock-sensorless cars for eons with no issues. Its all in the tuning.
            sigpicM42 Brigade ... Throwing craze in the 318

            Comment


              #7
              Originally posted by Streetspec_iS
              which brings us back to the old question regarding necessity of knock sensors. People have been boosting knock-sensorless cars for eons with no issues. Its all in the tuning.
              Truth.
              Adam Fogg- '88 M3

              Common sense- It's the new 'gifted'

              Comment


                #8
                Re: M42 & Knock Sensors

                Originally posted by cgregory
                My car has the engine out of a '93 318is. It's fitted with the knock sensors, but it's still using the stock wiring harness. What can I do to get the knock sensors functioning? I'm pretty sure I'd need a '93 wiring harness, but would I need anything else?

                The reason being that someone is selling a DASC, and I'd need the knock sensors to be able to use it :twisted:
                being the owner of an M42 and curious about anything regarding it, I'd like to know what a DASC is and what it does? Aside from the knock sensors, are there any difference between the E30 M42 and the E36 M42, I recall reading a thread by Beemerfanatic saying they're the same?
                E30 325i 1990 (Winter beater)
                E36 M3/4/5 1997 (Futur IP car?)
                BMW Club of Quebec

                Comment


                  #9
                  Re: M42 & Knock Sensors

                  Originally posted by silverblades181
                  Aside from the knock sensors, are there any difference between the E30 M42 and the E36 M42, I recall reading a thread by Beemerfanatic saying they're the same?
                  I believe the only real differences between them are the offormentioned knock sensors and the e36 M42 uses a different belt system enabling it to use a variety of superchargers ont he market.

                  James

                  Comment


                    #10
                    The early model E36M42 still using similar belt configuration as found in the E30M42 (3 belts).. only the later E36M42 used 2 belts which is similar to the M44.... the Downing Atlanta SuperCharger is made for the M44 which is using the 2-belt system..
                    BMWClub Malaysia
                    www.bmwclubmalaysia.com

                    Comment


                      #11
                      Oil pans, manifolds, belt system, electronics, and other minor details are different.

                      The main lumps of of them (head, block, internals) is all the same though.
                      Adam Fogg- '88 M3

                      Common sense- It's the new 'gifted'

                      Comment


                        #12
                        Originally posted by AdamF 88iS
                        Oil pans, manifolds, belt system, electronics, and other minor details are different.

                        The main lumps of of them (head, block, internals) is all the same though.
                        Does that mean you could put a DASC on an E30 M42 if you assumed the risk of no knock sensor?

                        RISING EDGE

                        Let's drive fast and have fun.

                        Comment


                          #13
                          Originally posted by Digitalwave
                          Originally posted by AdamF 88iS
                          Oil pans, manifolds, belt system, electronics, and other minor details are different.

                          The main lumps of of them (head, block, internals) is all the same though.
                          Does that mean you could put a DASC on an E30 M42 if you assumed the risk of no knock sensor?
                          I don't think so because of the belt system.
                          The BMW 318 is back. With a vengeance.

                          Comment


                            #14
                            Originally posted by fabianyee
                            The early model E36M42 still using similar belt configuration as found in the E30M42 (3 belts).. only the later E36M42 used 2 belts which is similar to the M44.... the Downing Atlanta SuperCharger is made for the M44 which is using the 2-belt system..
                            Downing Atlanta also makes some for the E36 M42s. They actually sell many different kits, because minute changes were made quite often (brackets and things changed almost every MY). There's a big FAQ on their website.

                            Another difference between the E30 and E36 M42s is in the intake manifolds...supposedly the E30 intake is optimised for performance while the E36 for fuel efficiency or something like that. They're interchangeable though; I'm running the E30 intake.

                            As for running without sensors...I don't think I'd want to risk it. 10:1 CR + 7.5psi doesn't seem like a good combo for 93 octane with 'em. I'm going to keep looking for an ECU and a wiring harness. It seems like it could get to be kind of a PITA though :|

                            Comment


                              #15
                              what kind of numbers are you looking at with a DASC?
                              E30 325i 1990 (Winter beater)
                              E36 M3/4/5 1997 (Futur IP car?)
                              BMW Club of Quebec

                              Comment

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