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VF bimodal pin diagram

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

  1. Twoparkers

    Twoparkers New Member

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    is it possible to get them opened from the closed position ?
     
  2. daz_au

    daz_au Active Member

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    I doubt its rocket science for someone to come up with a PWM generator for it to work, it just comes down to someone with the right skills having the right motivation. Chevy SS owners are asking for the same thing, someone will probably get it done eventually.

    The other option would be to cut the vacuum actuators off older bimodals and weld them in place of the electronic ones. I hooked up a set of HSV vacuum actuated mufflers on a project car and although you need a vacuum line from the front, the switchgear is very simple.
     
  3. rucxy

    rucxy Donating Member

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  4. cashie

    cashie Active Member

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    I’ve got a set of VF2 flanged BiModal Sedan mufflers and a module to drive them from the Corvette Forum design.
    https://www.corvetteforum.com/forum...full-open-close-non-factory-npp-retrofit.html

    I’ve sold my car now, I’ve not tested the above module but the previous owner on the Corvette Forum claims it worked well (I never got the opportunity to test before selling my car). It comes with a set of new plug connectors for the mufflers too.

    Happy if someone in Perth wants to take a punt and make an offer to collect the lot from Mandurah or Rockingham.
     
  5. Wagonboy

    Wagonboy New Member

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    PM sent
     
  6. Mattricho

    Mattricho Active Member

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    Sorry to dig up an old thread but has anyone got some series 2 bimodal mufflers working on a series 1??

    I have done some googling and calling around to no avail.

    Have called 2-3 auto elections and both have given up on me.

    All that googling has told me is I know f**k all about car electrics lol all the pwm and -4.5v to 4.5v waves and stuff lol

    I just want to be able to turn them on and off from in the car.
     
  7. 426Cuda

    426Cuda SUBLIME!

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    Hey @monstar didn't you post up some time back an ebay sourced dongle thingamajig that would work?
     
  8. Pablito

    Pablito Well-Known Member

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    I think that was a switch for series 2's that allowed you to have the valves always open without having to pull the fuse.
    As far as i know, from when i looked into it a while back, no one has been able to get them too work on a series 1. Turned out to be too difficult of a job for those who tried.
     
  9. John Revill

    John Revill Active Member

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  10. John Revill

    John Revill Active Member

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    I am working on a prototype for a Arduino base Bluetooth/Android controller for my bimodal exhaust. Got nearly everything to built the first prototype except for the 5 pin plugs.
    Here is a video of my proof of concept and is where I am at so far. It is fully functional but not practical and far from pretty.
     
  11. Maz

    Maz Member

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    Hi John - looks like your vid is unavailable. I'm interested to see how you've gone with this.
     
  12. John Revill

    John Revill Active Member

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    That's interesting. The video is still working fine for me.
    Try going to youtube directly at
    https: //youtu.be/jodcE-Cxfoo <--- Remove the space between the : and //
     
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  13. Skylarking

    Skylarking Well-Known Member

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    I also had problems viewing the video when i first clicked on it a few days ago but on the following day it worked without issue. Computers...., go figure ;)

    As to your Arduino project, great prototype :cool:

    Not knowing much about how Holden has coded the logic for it's Bimodal exhaust, does your prototype need BT connection to the vehicle data via ODBII or is it just an easy way to switch it without needing lots of cabling into the cabin?

    Do you have a web page for this project and are you planning on open sourcing your Arduino code and circuit diagram? :cool:
     
    Last edited: Feb 21, 2018
  14. John Revill

    John Revill Active Member

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    The Car I am putting the bimodal exhaust on (Holden WN Caprice) does not have bimodal support, so this solution simply allows me the open and close the value without the need to run cables into the cable. The is no ODBII port support in my prototype, but one day I might be play with the idea.
    This prototype is basic and just to prove the basics work. The Bluetooth protocol I am using has no error checking and no security. So there is work to do there. I also planning to add EEPROM support to allow the last selected mode to be automatically recalled on startup. The project is not open source yet, but in the coming weeks I will set something up on github.
     
  15. Skylarking

    Skylarking Well-Known Member

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    Looking forward to the code on github and hopefully you’ll include the circuit diagrams as well within some linked web page.

    Pity MyLink isn’t more open as installing an app on that would have remove the need for the phone being a requirement. But it does sounds like it would be a trivial mod to your prototype to include a manual toggle switch somewhere in the cabin cabled to the Arduino which is itself cabled to the rear muffler motor, needing no MyLink or phone app :)
     
  16. John Revill

    John Revill Active Member

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    The toggle switch idea is already on the plan, although I probably wont use it myself. Because the heart of this is an Arduino, I can implement an infrared Remote, or a RFID tag, a numeric pin code panel, a toggle switch, an illuminated momentary push button. You name it, it is probably an easy add to the Arduino. These are all things that can be looked into as the project matures.
     
  17. 426Cuda

    426Cuda SUBLIME!

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    If you can package this up into a DIY kit at a reasonable price, I'm in!
     
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  18. Mattricho

    Mattricho Active Member

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    What cuda said
     
  19. John Revill

    John Revill Active Member

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    The project has come to a halt at the moment due to available time and a hurdle I haven't worked out yet. I'll post up an updated video on where it is at at the moment. I have a fully functional prototype now and a much more refined android app, but the problem I am having is power. I have located accessories power but found that on a remote start, the accessories do not power up and the valves will not close. I need to locate a power source when ignition is on. I've got 119 pages of wiring diagrams to go through and haven't had the time to decipher them yet. But on a quick skim through the schematics, it looks like I may have to run wires to the front of the car after all. I was trying to avoid extra spaghetti throughout the car.

    IMG_5564s.JPG
     
    Last edited: Jul 14, 2018
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  20. John Revill

    John Revill Active Member

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    The project has just had a breaktrought thanks to Stooge. I had already checked for a fuse in the boot for ignition and must have missed it. Haven't had time to go over it again. Stooge has found the correct fuse (as shown here https://forums.justcommodores.com.au/threads/electronic-bi-modal-valves.272608/) and it means this project can come to life after all. I'll post some info on the weekend with a video.
     

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