Faulty CG Precision Exhaust valve controller

Discussion in 'F80 M3 Saloon / F82 M4 Coupe / F83 M4 Convertible (2014-present)' started by madein, Mar 26, 2020 at 9:14 PM.

  1. 26 Mar 2020 at 9:14 PM #1
    madein

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    Gents,

    with the few days off I kind of start finishing the projects I had for long time and I'm trying to make new Exhaust Valve controller.

    I'm going different way then the CG, as I will have 3 positions, OPEN/CLOSE and OEM so you can close the flaps in sport/sport+ mode if you need as well.

    I have all on the bench and working, however if someone has faulty CG controller it would help me a lot for the wiring length and connections.

    If someone still have faulty CG Precision Valve Controller and will be able to send it to me for the postage cost I would really appreciate this.

    Thank you in advance
     
  2. 26 Mar 2020 at 9:21 PM #2
    JwilliamsM

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    i have one thats knackered, not sure where i put it though. if i find it i'll give you a shout
     
  3. 26 Mar 2020 at 9:25 PM #3
    madein

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    Thank you, appreciate this, you will be first on the list, when this will be for sale, expecting the price half of the CG
     
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  4. 27 Mar 2020 at 12:19 AM #4
    Scrubs

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    You'll be popular if you pull that off, madein. It's the one mod that you still see people looking for a lot on here. Mine went knackered as well. Not sure where I put it but will also give you a shout if I find it.
     
  5. 27 Mar 2020 at 4:26 AM #5
    Nathan

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    Have you measured the effect of having exhaust closed in sport plus at full boost / throttle? You sure it won’t be detrimental to the engine?
     
  6. 27 Mar 2020 at 8:09 AM #6
    madein

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    Thank you. It would be big help
     
  7. 27 Mar 2020 at 8:15 AM #7
    madein

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    Good point, but not, I didn’t.

    It is only option if you have loud exhaust and want to attend track days and drive in sport/sport+.

    I know lot of us can drive on full throttle, but as I’m in London my options are limited
     
  8. 27 Mar 2020 at 3:53 PM #8
    ChristianF

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    I was thinking about making one of these. A PWM module is about a tenner fully complete. That's all the exhaust motor needs to activate it.

    It's the connectors that are difficult to come by. If anyone knows how to get hold of them this would be a doddle.
     
  9. 27 Mar 2020 at 3:59 PM #9
    Plastic B

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    This thread might help: https://f80.bimmerpost.com/forums/showthread.php?t=1516059
     
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  10. 27 Mar 2020 at 4:25 PM #10
    madein

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    PWM module with 2 frequencies, or two PWM modules to open or close, remote control, wiring, thermal protection for the wires, box, bracket, connectors.

    It will be more than tenner
     
  11. 27 Mar 2020 at 8:07 PM #11
    stiggly

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    When I look back back I do wonder if these controllers (I had a burger valve controller) contributed to the failure of 2 ‘brand new’ M performance exhausts. Let me explain......my M4 was non CP and I used to drive it with flaps open on sport plus, as I loved the bang (not overrun) I got when lifting off in higher gears.

    However my first MPE failed at the welded seam on the back box (6 months after using the controller). I never mentioned the controller to the dealer and they rightfully exchanged the MPE. 4 months later the exact same happened again.....was the pressure too much maybe?

    MPE was replaced but never fitted as I sold the car and the replacement MPE separately.

    Anyone has a similar experience?

    [​IMG]
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    [​IMG]
     
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  12. 27 Mar 2020 at 8:12 PM #12
    ChristianF

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    Only need one PWM for my purposes, and a relay. 90% duty cycle to force open and OEM passthrough for any other time (or close)

    Be interested to see what you are up to though.

    I think I’d rather put the controller in the boot by the REM rather than under the car like CG does.
     
  13. 27 Mar 2020 at 8:15 PM #13
    ChristianF

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    wouldnt the flaps open decrease the pressure in the can?
     
  14. 27 Mar 2020 at 9:07 PM #14
    madein

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    This is excellent idea, I need to see if there are any wires going down through the boot at some point. As the CG is mounted on the bottom, it is really simple to install/uninstall.

    So I use PWM 10/90% to open or close and remote control to chose in between open/close/oem.

    I have all working on the bench, just need to tide up and make a bracket and see what box I can use.
     
  15. 27 Mar 2020 at 9:11 PM #15
    madein

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    As Christian said, it would reduce the pressure as it actually bypass the back box.

    I don't think it is related.

    To me I love the sound with the flaps open, but on London traffic it is not always good to be in sport/sport plus and the CG price is big rip off for what it is. Just the M badge so 100% on the top of normal price.
     
  16. 28 Mar 2020 at 6:37 AM #16
    stiggly

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    hmmm....possibly?
     

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