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    Injector swap question

    I search for that without any luck....sorry if it an answered question...
    Do I need to change the Fuel Pressure Reg If I swap my injectors with a set of 17.5lbs ones (m50) and swap to a MarkD chip (17lbs and 93 oct)??

    I think the M30 comes with a 3.0bar FPR, but I'm not sure. That could work?

    E30 325is '89
    E46 330ci '04

    #2
    Don't swap regulators, all it does is confuse the ECU and lengthen the adaption process.
    Tenured Automotive Service Professional - Avid BMW Enthusiast

    Vapor Honing & E30 ABS Pump Refurbishment Service
    https://mtechniqueabs.com/

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      #3
      Originally posted by Jordan View Post
      Don't swap regulators, all it does is confuse the ECU and lengthen the adaption process.
      Ok.. But Do I need a new one (I think BMP has a good one) , or can I use the stock one?

      E30 325is '89
      E46 330ci '04

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        #4
        i personally cant see how the M50 injectors could possibly be good for the M20. the spray pattern is setup for for a 4 valve head. so it is going to be spraying completely wrong for the shape of your intake port. right?

        I am not sure, but wouldnt the M30 injectors be better?

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          #5
          it's not a matter of "made for a 4 valve head". they are just design II/III injectors - which were used on all sorts of motors (including lots of 2 valve Fords).
          Build thread

          Bimmerlabs

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            #6
            As Nando said, and in addition your stock FPR is fine.
            Tenured Automotive Service Professional - Avid BMW Enthusiast

            Vapor Honing & E30 ABS Pump Refurbishment Service
            https://mtechniqueabs.com/

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              #7
              Originally posted by Jordan View Post
              As Nando said, and in addition your stock FPR is fine.
              Thanx man

              E30 325is '89
              E46 330ci '04

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                #8
                Dont use injectors from an 83 84 533i [low ohm]. They will work in an ETA motor but not an I motor.


                Originally posted by vlad
                Do you know anybody else who built that many bad ass E30s?

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                  #9
                  I have M50 injectors with a chip and M30 AFM, stock FPR.
                  BimmerHeads
                  Classic BMW Specialists
                  Santa Clarita, CA

                  www.BimmerHeads.com

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                    #10
                    are they really the same injector? I am not doubting you, because I really dont know what fords you are talking about. could they have different attomizer nozzle things on them? I am in school over here, and we just went over that topic a week or so ago. They are 100% designed for a 4 valve head(the ones in a M50) they spray in a pattern that shoots a stream to the left and right. There is alot in the design of how fuel is sprayed(i know in a 20 year old motor) it isnt such a big thing.

                    any german mechanic would tell you not to use them because of that. once again, I am not saying it doesnt work, just questioning if it is not better to use the M30 injectors.

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                      #11
                      Originally posted by MR 325 View Post
                      I have M50 injectors with a chip and M30 AFM, stock FPR.
                      Do you Dyno'ed?

                      E30 325is '89
                      E46 330ci '04

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                        #12
                        Originally posted by mikeedler View Post
                        are they really the same injector? I am not doubting you, because I really dont know what fords you are talking about. could they have different attomizer nozzle things on them? I am in school over here, and we just went over that topic a week or so ago. They are 100% designed for a 4 valve head(the ones in a M50) they spray in a pattern that shoots a stream to the left and right. There is alot in the design of how fuel is sprayed(i know in a 20 year old motor) it isnt such a big thing.

                        any german mechanic would tell you not to use them because of that. once again, I am not saying it doesnt work, just questioning if it is not better to use the M30 injectors.

                        The M30 19lbs Injectors are too big for the set up I want.

                        E30 325is '89
                        E46 330ci '04

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                          #13
                          Originally posted by capucastro View Post
                          Do you Dyno'ed?
                          I have not but I should do it soon!
                          BimmerHeads
                          Classic BMW Specialists
                          Santa Clarita, CA

                          www.BimmerHeads.com

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                            #14
                            FYI... even if one of the BOSCH design II injectors are setup to fork the spray to the sides (which I doubt, but I'm entertaining the thought) I seriously doubt it would make a damn bit of difference in a running engine.

                            In a static environment you will see a wonderfully atomized cone of fuel. At the monstrous feet per second the intake charge is rushing by the pintle.. I just don't see the spray pattern mattering a damn bit.
                            Tenured Automotive Service Professional - Avid BMW Enthusiast

                            Vapor Honing & E30 ABS Pump Refurbishment Service
                            https://mtechniqueabs.com/

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                              #15
                              yah, you must be right. the spray pattern has absolutely nothing to do with power or the way a car runs or anything like that, those stupid bosch engineers just make crap up.

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