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VF bimodal pin diagram

Discussion in 'VF Holden Commodore (2013 - 2017)' started by snistr, Sep 6, 2016.

  1. snistr

    snistr New Member

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    Hi all, hoping someone can help. Looking for a pin diagram for the VF electronic bimodal unit. There are 4 pins and would like to know which is ground, power etc. the exhaust is not on the car so I can't put a multimeter to test. Any help would be great.

    I got my hands on a VF clubsport exhaust and would like to fit and if possible connect the bimodal via a switch.
     
  2. blackvx

    blackvx Member

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  3. Nfsve

    Nfsve Member

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    Power, gnd, PWM in, .... not in that order though.
     
    Last edited: Sep 12, 2016
  4. snistr

    snistr New Member

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    wow didn't really expect it to be so complicated.

    I do have the plug for one of the mufflers and there is only three wires coming out.

    But looks like its harder than just connecting12v to the bimodal unit via a switch.
     
  5. TazzI

    TazzI Envyous Customs

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    Right, thats both a very (extremely) smart implementation.. and also a very silly one.

    The design has zero 'smarts' behind. That entire problem can be eliminated by using a microcontroller instead. And a simple on/off switch.

    Can be designed with a transistor, or solid state relay to pulse the 12v signal to the unit at the required frequency. I skipped a little bit of the more technical details, but assuming we need a nice square wave then the coding is extremely simple..
    Even a none equal on/off square signal is just as easy to implement.

    Small handful of coding required...

    while (true){

    if (digitalRead(BimodalSwitch) == HIGH)
    {
    digitalWrite(HIGH, RelayPin);
    delay(FrequencyCalc);
    digitalWrite(LOW, RelayPin);
    delay(FrequencyCalc);
    }
    }
     
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  6. Nfsve

    Nfsve Member

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    Do you have a picture of the plug?
     
    Last edited: Sep 12, 2016
  7. Nfsve

    Nfsve Member

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    Pin 1 gnd, pin 4 12v, pin 3 PWM in
     
  8. snistr

    snistr New Member

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    Ill try to load a pic tonight
     
  9. Mavericks Choice

    Mavericks Choice Well-Known Member

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    I have a my16 SSV M6 Ute with bi modal what gets me is the crackle/fart on decel/gearchange especially when cold. It appears to me that the butterflys when in the closed position flap about under exhaust! I have no idea why they don't incorporate some type of return spring to hold there position when not actuated?
     
  10. snistr

    snistr New Member

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    image.jpg image.jpg image.jpg
     
  11. vinnycolouda

    vinnycolouda New Member

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    Hey mate
    Where did you get hold of the plug? Is it available as a spare from Holden? I've fitted a pair of vf2 bimodals to my vf1 afm auto and wanna toy with the position of the flap to see if I can maintain a half decent note whilst minimising the afm drone... Sound quite good untill the afm crashes the party!!!
     
  12. snistr

    snistr New Member

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    hi. I got the plug with the exhaust. But based on what I've researched, its a lot of work to get the bimodal to work. properly. Apparently its not just connecting 12v power.
     
  13. Ripper_017

    Ripper_017 Member

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    anyone get any further with working this out?
     
  14. snistr

    snistr New Member

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    No ended up being a harder task than what it was worth. I just got the mufflers installed without the bimodal. And i don't actually mind it. Its not too loud and very little drone.
     
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  15. BlackVXGTS

    BlackVXGTS Well-Known Member

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    Check out the diagram attached. Don't know what all the components mean, except that I know the wiring involves a fuse and a relay which should be somewhere in the diagram.
     

    Attached Files:

  16. Ripper_017

    Ripper_017 Member

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    thanks for the diagram i may show this to a friend and see if they can work this out.
     
  17. Mattricho

    Mattricho Member

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    Hi all sorry to dig up a old thread but I just bought a set of vf series 2 bimodal mufflers for my series 1 ssv and I want to get them working..


    Has anyone figured out how to get them working??
     
  18. Mattricho

    Mattricho Member

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    Anyone have an idea??

    Called Holden spares on Friday and found out you can buy the bimodal wiring harnesses for $150..

    I don’t know if the wiring harness goes to the relay in the boot from the mufflers or if it’s just the connectors on the mufflers and that connects into some wiring somewhere?

    What I’m hopping is that I can buy the wiring harnesses and connect a remote or button in the car somewhere..
     
  19. cashie

    cashie Active Member

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    You can’t just connect up a remote or button, the mufflers need a PWM signal to cycle off and on.
    It’s not a simple process to activate them.
     
  20. Mattricho

    Mattricho Member

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    Thanks cashie
    Ok I’m looking into the pwm to see if I can sort something out there. If not, can the standard bimodal motors be be changed out for ones that just need a 12 volt on off switch?
     

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