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VF V8 AFM Exhaust Drone Fixed

Discussion in 'VF Holden Commodore (2013 - 2017)' started by HollySSV, Jan 27, 2020.

  1. HollySSV

    HollySSV New Member

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    Hi All,
    first time posting long time viewer. I have been watching quite a few posts on afm drone with larger exhausts, particularly with VE & VF wagons. I finally figured out on my wife’s VF SSV after much trial, how to all but eliminate the drone while afm is still active on the car.
    My exhaust fitted is as follows:
    1) VF HSV GTS Extractors & Cats
    2) HSV 2.5inch Catback with VE/ VF1 vacuum Bimodal mufflers
    3) eBay vacuum controller kit for bimodal mufflers.
    The exhaust sounds fantastic in 8cyl mode with my Walkinshaw intake and bimodals open at wot. It’s when it cuts down to 4cyl mode at about 50-60kph and 100kph with mufflers open the horrendous drone kicks in. I found I was having to constantly close the bimodals to kill the drone.
    After chopping and changing around with different mufflers and ideas, I finally got the shits and started researching into other options such as H & X pipes. Today I finally got the courage up to pull out the Welder, Dremel, Grinder and some pipe. Low and behold I have finally fixed the drone issue in loud mode. I added a 2.5 inch H pipe section to just behind the center resonators or hotdogs, what ever you want to call them. Wow!! what a difference it has made. I can now drive around in 8 or 4cyl mode bi modals full open and no drone at all. I am so happy with the end result. I can now enjoy the sweet V8 sound without my ears bleeding from that horrible noise. I hope this may help anyone suffering the same issues.
    Cheers Josh
     
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  2. VECalaisV8Wagon

    VECalaisV8Wagon Member

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  3. krusing

    krusing Well-Known Member

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    Great idea, but I like the economy of AFM, the main reason of my purchase,
    Power and Economy, best of both worlds.
    Especially when I can drive from Melbourne to Mildura and still have 1/4 left, it’s got to be a win, win.
    Taking into account, the fuel in regional areas can be up to 20c dearer per ltr.
     
  4. krusing

    krusing Well-Known Member

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    Well done,
    Wish I had of know this when I had my SSV rear mufflers on, they just finished my car, especially when it was idling,
    I loved the (quiet) low V8 deep note, but loathed the drone in 4cyl mode.
     
    Last edited: Jan 27, 2020
  5. krusing

    krusing Well-Known Member

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    After thinking about what you had done, I remember back to my 77 LX Torana days, when I put extractors on my 4.2, and kept the remainder of OEM exhaust, and that had a “H” section in the centre, and that was used to equalise the pressure difference between the left and right pipe.
    And loved the low V8 note that was not too loud.
     
    Last edited: Mar 9, 2020
  6. Milo 6.0

    Milo 6.0 Active Member

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    I have a vf 1 ssv wagon with 2.5 x force catback,ve hsv extractors and venom high flow bolt in cats,no drone,mine is tuned though with the afm disabled.
    Personally i think disabling the afm will help the factory lifters last alot longer,its the constant opening and closing of the outer sleeve in afm mode that wears them out,fuel economy in mine is barely worse than stock,less than a litre per hundred.
    I think mine was between 12.5 to 13 stock in the city,it never really goes over around 13.5 in the city tuned with exhaust otr and diff gears,alot better on the highway and alot more fun to drive,smiles per miles wins for me.
     
  7. HollySSV

    HollySSV New Member

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    I did look at purchasing the range disabler, but I wanted to keep the AFM on due to most of the kms being done around town. Krusing, I also notice that the VF2 GTSR had a factory H pipe. Not sure if it was for performance and sound or some drone issues as well. Some corvettes and the new Camaro also have H or X pipes fitted.
     
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  8. krusing

    krusing Well-Known Member

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    On the subject of a X pipe, and on a different tangent,
    I did notice my VY Super6 has a X pipe, being all stock and I have noticed the exhaust note does also sound a bit different than a stock V6. [L36]
     
    Last edited: Mar 10, 2020
  9. panhead

    panhead Well-Known Member

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    I had a H pipe fitted to my Torana 30 or more years ago to balance the exhaust, it's not new science.

    And yes it definitely changes the sound of the exhaust, it smooths it out.





    .
     
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  10. krusing

    krusing Well-Known Member

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    I bet you wish you had the Torana now ?,
    because I sure do, because it was a Ton of fun !
     
  11. HollySSV

    HollySSV New Member

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    I gather the h pipe has allowed a better scavenging effect. Also allowing exhaust flow to the other pipe increasing pressure when in 4cyl mode. This may help to fill the rear mufflers to remove the drone.
     
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  12. krusing

    krusing Well-Known Member

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    Sorry to bring up an old thread,
    Was thinking about the H pipe Mod, so I can try the SSV rear mufflers again with no Drone.
    I have an image of the V8 VE Exhaust pipes, and just wondering,
    where I have circled, is that where you installed the H pipe to stop the droning in 4Cyl Mode ?
     

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    Last edited: Mar 10, 2020
  13. HollySSV

    HollySSV New Member

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    Hi Krusing, yes that's the correct spot just in front of the elbow. I added a 2.5 inch section.
     
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  14. mpower

    mpower Well-Known Member

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    have any of you considered j-pipes?
     
  15. HollySSV

    HollySSV New Member

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    Hi MPower, I did purchase a set of J pipes. I found they were to loud in the wagon and still droned a substantial amount due to the size of the cabin rear. I have listen to them on a sedan and the reverberations seem to be much less.
     
  16. mpower

    mpower Well-Known Member

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    on what size pipes?
     
  17. HollySSV

    HollySSV New Member

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  18. mpower

    mpower Well-Known Member

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    shame you don't get a better result, i did j-pipes on my sedan 2.5" and yeah - no drone.
     
  19. HollySSV

    HollySSV New Member

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    Yeah, I was very impressed with how they sounded on the sedan. A nice deep note. I just couldn’t get past the reverberations in the wagon, even with dynamatt in the spare wheel well and surrounding floor.
     
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  20. krusing

    krusing Well-Known Member

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    My nephew had J pipes on a ute, and the noise was horrible, I ever said the same to him, he has since changed them to something better.
     

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