Announcement

Collapse
No announcement yet.

BMW Vanos guide

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • BMW Vanos guide

    "M" Generation double VANOS like the S54 and S50 B32 (not the S52) are also infinitely variable timing for both the intake and exhaust camshafts except their control methods are different. To sustain the more rapid changes of valvetrain timing and greater forced exerted, each camshafts are controlled by 2 hydraulic solenoids (1 inlet pressure and 1 outlet pressure by camshaft) so you end up with 4 solenoid to control. That will require 4 x GPC's on the SM4 (2 for intake, 2 for exhaust) they are PWM by 12v switching and also require the 2 cam inputs. The cam feedback is via 6 teeth wheel on the intake side and 7 teeth on the exhaust side for more accurate monitoring of cam position. The max VANOS spread on the intake side is of 60 degrees and exhaust 40 degrees (crank) so be careful with the initial setup. I attach attach a picture of the base setup for your reference as it might help you get started.

    Hopefully this will help understand the major controlling differences for the various VANOS systems. They are "normal" hall effect sensors unlike their M52 cousins. You need to modify the cam triggers so they have either 6, 3 or 1 tooth. This simplest is to make them all one tooth and then also share one of the cam signals with the reference signal. The term BMW commonly uses is Single and Double VANOS. Here is a brief overview of what BMW refers to as "Single VANOS" and "Double VANOS". If only the intake valvetrain timing is controlled it is called "Single VANOS" and if the intake AND exhaust valvetrain timing are controlled it is then called "Double VANOS" same rules apply for all BMW engines, straight or V type (you just end up with twice the hardware on a V engine)
    Here listed is examples naming Single or Double VANOS for each engine and how many solenoid outputs required on the SM4 to drive them:
    6cyl.
    M50tu = Single VANOS (on/off) - 1 solenoid I/O
    M52 = Single VANOS (on/off) - 1 solenoid I/O
    M52tu = Double VANOS (Infinitely variable) - 2 solenoid pwm
    M54 = Double VANOS (Infinitely variable) - 2 solenoid pwm
    N52 = Double VANOS (Infinitely variable) - 2 solenoid pwm
    ("M" Engine)
    S50 = Single VANOS (Infinitely variable) 1992-1994 not in u.s - 2 solenoid pwm
    S50 = Double VANOS (Infinitely variable) 1995-1998 not in u.s - 4 solenoid pwm
    S52 = Single VANOS (on/off) 1996-1998 u.s - 1 solenoid I/O
    S54 = Double VANOS (Infinitely variable) - 4 solenoid pwm
    8cyl.
    M62tu = Single VANOS (Infinitely variable) - 2 solenoid pwm
    N62 = Double VANOS (Infinitely variable) - 4 solenoid pwm
    ("M" engine)
    S62 = Double VANOS (Infinitely variable) - 8 solenoid pwm + 1 pwm solenoid pressure regulator
    S85 = Double VANOS (Infinitely variable) - 4 solenoid pwm + 1 pwm pressure regulator
    12cyl.
    N73 = Double VANOS (Infinitely variable) - 4 solenoid pwm

    Note: The engines starting with an "N" also have valvetronic variable intake valve opening, you would require extra outputs to drive the valvetronic adjusting motors and inputs for valve position feedback. Valve lift can be varied anywhere from 0.3 to 11mm.

    The left piston is exhaust, right intake. This position is at idle.
    The solenoids are as follow from left to right: -Exhaust Advance
    -Exhaust Retard
    -Intake Retard
    -Intake Advance

    Please note prior in this post it is mentioned cam timing spread angles for S54. For your S50B32 it is slightly different: intake 70 - 130, exhaust 76 - 114 degree.
    The diagram was mainly so you could identify the piston position relative to advance & retard. Piston out=advance, piston in=retard. So you are right in saying that this diagram represents exhaust advanced and intake retarded (minimum valve overlap). You are mentioning about rpm criteria to adjust camshafts position: if you observe the current (stock) behavior, it is based on 4 main criteria. Corse adjustment = RPM & throttle position, fine adjustment by intake air & coolant temp. This OEM mapping is not 100% oriented towards performance since it has to perform certain functions like adding a bit more overlap on intake side when under part load and hot engine to allow limited exhaust gas re-flow to act as internal EGR to reduce NOx. I therefore recommend you do not try to emulate too much the stock control strategy if you are trying to map an all-motor vehicle.

    Below is for BMW "Dual Vanos"




    Inlet Cam Retard Solenoid is located on front head, inlet side lower.
    Inlet Cam Advance Solenoid is located on front head, inlet side upper.
    Exhaust Cam Retard Solenoid is located on front head, exhaust side lower.
    Exhaust Cam Advance Solenoid is located on front head, exhaust side upper.

    Remove stock connectors on solenoid and replace them with new since stock contains some electronics.
    Last edited by MRMRacing; February 20th, 2008, 12:00 AM.
    Robert Jansson
    MRM-Racing

  • #2
    Has anyone tried a double VANOS with 4PWM's? That is, 2 hardware PWMs and 2 software PWMs.

    Also, re the references, the S50E30 single vanos I did had 8 teeth on the cam position wheel and magnetic sensors for crank and all cam sensors. But then, the engine designations are somewhat confusing so I think that was the correct designation.

    Comment


    • #3
      I know Ken at FISystems did a BMW E46 with dual Vanos. I hav ehis email and cal file, but this was only one valve at each cam.
      Robert Jansson
      MRM-Racing

      Comment


      • #4
        A good BMW engine guide for different types of Vanos.
        Robert Jansson
        MRM-Racing

        Comment


        • #5
          Originally posted by MRMRacing View Post
          I know Ken at FISystems did a BMW E46 with dual Vanos. I hav ehis email and cal file, but this was only one valve at each cam.
          ==
          it will see for study.... so interesting

          Comment


          • #6
            let's contunie this post?
            who was tuned s54(2) for dual vanos with 4 solenoids for cams control?

            Comment


            • #7
              Originally posted by sss7556 View Post
              let's contunie this post?
              who was tuned s54(2) for dual vanos with 4 solenoids for cams control?
              S50B32 with dual VANOS and 4 solenoids has been done and pattern is available. That has 60-2 crank, 6 teeth on intake cam and 6+1 teeth on exhaust cam.

              For S54 we would need to see if the patterns are the same as S50B32. The patterns are very complex to decode because of the VANOS ranges so different engines should have the patterns checked.

              Comment


              • #8
                Originally posted by Ian View Post
                S50B32 with dual VANOS and 4 solenoids has been done and pattern is available. That has 60-2 crank, 6 teeth on intake cam and 6+1 teeth on exhaust cam.

                For S54 we would need to see if the patterns are the same as S50B32. The patterns are very complex to decode because of the VANOS ranges so different engines should have the patterns checked.
                ===
                ok, I'll check
                I think cams has 8 teeth ea
                about s50 you can send sample trigger patter?

                Comment


                • #9
                  Wondering if someone can tell me what the wiring is for the vanos. Below is the diagram:

                  Cam ?

                  Cam ?
                  Pin 1 = ? Pin 3 = ?

                  Cam ?
                  Pin 4 = ? Pin 6 = ?

                  I'm assuming that pin 2 and 5 are grounds.

                  What I need to know is what the question marks are. Which pins are the intake cam and which is the exhaust cam. Also which pin retards the cam and which pin advances the cam.

                  Comment


                  • #10
                    This wiring looks like some other BMW's settings. This engine use 12+ from ecu to activate the valves, you have to wire them backwards since SM4 has ground on the outputs. So you need to hook up 12v on instead of the ground and remove the diods inside the connectors ( use new connectors without the diods)
                    Robert Jansson
                    MRM-Racing

                    Comment

                    Working...
                    X