1. 15 Feb 2020 at 8:52 AM #1
    JC7

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    Morning fellow cutters!

    What downpipes have you got fitted on your F80 and F82?

    I’ve tried 3 different downpipes and also of them make a buzz type noise under acceleration and during downshift. Fitted to my 2016 LCI F80

    There not leaking as I have checked this, gaskets replaced every time and soon as the stock downpipes back on the noise goes.

    It almost sounds like an E46 M3 exhaust note, that metallic rattling rasp. It’s hard to hear from a video but it’s 100% there.

    I can’t work out whether it’s either

    1. Because the finish on the downpipes so the welds aren’t perfectly smooth so they are causing turbulence making the noise

    2. Because all downpipes do that slight noise but some people don’t listen out for it so a 100 cel or 200 cel would eliminate it

    3. Because of the bends in the pipes aren’t super smooth causing again turbulence.

    The moment my stock downpipes are fitted back on the noise goes. Anyone else get this noise, if so what downpipes are you running? Or if anyone is local to Chelmsford / Southend area and have downpipes can I come and listen to yours! :D

    I’m considering trying masata or VRSF next as I know the welds are smoother (from pictures) and if the welds are causing the noise this could cure it! Thanks in advance. Failing that I’ll go and get the R35 GTR today that I’ve been eyeing up for a few weeks :muttley:
     
  2. 15 Feb 2020 at 9:45 AM #2
    madda

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    Slight plug, but maybe my ears are not as sensitive as yours? These are my old downpipes and I never experienced any sort of buzzing. Their quality is awesome.

    http://rover.ebay.com/rover/1/710-5...29508&kwid=902099&mtid=824&kw=lg&toolid=11111


    However, the noise of the car was never pleasing, and I prefer the e92 which is why I’m back in one! Also getting tempted by my first R35. I was never a fan but the price is now quite attractive, but they still have some way to drop I think. Today there are 103 examples on eBay alone!! Madness for what is quite a exclusive rare car to see on the road.
     
  3. 15 Feb 2020 at 11:20 AM #3
    Leeadam

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    I had Tom Wrigley fit vrsf dp and AA mid on mine. Sounds decent. Well as decent as an m4 can sound.
     
  4. 15 Feb 2020 at 11:23 AM #4
    cossie1

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    There are only 2 things I can think of that could be refereed to as a buzz type noise.

    1) the downpipes are vibrating on something when the engine is moving (accel / downshift).

    2) the gases are resonating in the downpipes and you can hear it as the stainless is fairly thin and without the cats there is no resonator to remove the noise (although I fitted resonated decats to my E46 M3 and could still hear the gasses as at first I thought the exhaust was blowing).
     
  5. 15 Feb 2020 at 11:39 AM #5
    TerryLloyd

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    Just heads up on the R35 it is an awesome car to own - but when you change the exhaust after a while the drone gets on your nerves -Tuned (they nearly all are ) on track and after 3 laps everything starts to melt brakes/tyres/gearbox/rods coming through the block unless you spend @£40k+ on them apart from that they are cool :)
     
  6. 15 Feb 2020 at 12:01 PM #6
    JC7

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    Thanks for the responses guys. Anyone else got experience with downpipes on an F80/82?
     
  7. 15 Feb 2020 at 12:02 PM #7
    JC7

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    Thought they were reliable?! My other option is a C63s W205 Saloon
     
  8. 15 Feb 2020 at 12:05 PM #8
    Conor wood

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    What downpipes have you had ? I read somewhere that they need a good few miles on them to built up the soot inside to illuminate some noises from them not sure how true this is tho
     
  9. 15 Feb 2020 at 12:19 PM #9
    JC7

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    JR and MTC.

    Yeah I quite believe for me it makes the car undriveable so thought I would touch base with others to see if they have experienced the same.
     
  10. 15 Feb 2020 at 12:26 PM #10
    T5Pilot

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    I’ve got MTC’s fitted. Zero issues with mine, no buzzing or abnormal sounds at all.
     
  11. 15 Feb 2020 at 2:10 PM #11
    JC7

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    It’s like a hiss type buzz. Done it on 3 sets of downpipes so I’m very confused you’ve never had it.

    Have you listened out for it? Windows down, downshift into 1st or under partial throttle.

    Also we’re yours new or used? Cheers
     
  12. 15 Feb 2020 at 3:41 PM #12
    Jacko 11

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    RM motors - made in Poland and looks a good piece of kit with flex part. I wouldn’t pay a fortune for DPs as only a bit of pipe.
     
  13. 15 Feb 2020 at 3:41 PM #13
    Rude

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    Akra downpipes. As ever with Akra, they’re lovey, fit perfectly and sound the nuts
     
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  14. 15 Feb 2020 at 6:54 PM #14
    JC7

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    Would love to get some but at £1300 I can’t risk the buzz / hiss noise.

    You have to have the window down to hear it and if you have an ear for sound you will hear it. If not you’ll think it sounds normal.

    Anyone in the Essex area got downpipes fitted??

    Im beginning to think it’s the welds causing turbulence on the cheaper downpipes.

    Debating trying evolve / VRSF / masata.
     
  15. 15 Feb 2020 at 7:05 PM #15
    cossie1

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    It won't be the welds, the flow through those pipes is not going to be disturbed by a couple of rough welds (well not enough to make a noise you can hear).
     
  16. 15 Feb 2020 at 7:21 PM #16
    JC7

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    Maybe the bends then. It seems some pipes have got sharper bends than others.

    I’ll give it another go anyway as MTC and JR are cheaper. What do you guys reckon it’s worth trying...Evolve or VRSF pipes?

    Anyone in Essex with downpipes I could have a listen too?
     
  17. 15 Feb 2020 at 7:40 PM #17
    TerryLloyd

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    Just a thought .From what i read there is a thin gasket between the down pipe and the turbo , are you sure you dont have them or one of them stuck to your oem down pipe hence why the noise goes when putting stock ones back on
     
  18. 15 Feb 2020 at 8:14 PM #18
    JC7

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    No both gaskets replaced. There is actually a groove on the turbo in which that gasket sits.

    Ive listened from underneath and it actually comes from the pipe itself. Definitely turbulence but can’t work out what’s causing it.

    Welds, bends, quality and thickness of stainless etc. Or do they all do it but people don’t drive with the window open and listen for noises like me! lol
     
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  19. 15 Feb 2020 at 10:01 PM #19
    Ats101

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    I don't like rasp in the exhaust.. i have akra and i wouldnt decribe it as a raspy exhaust whatsoever.
     
  20. 15 Feb 2020 at 10:20 PM #20
    JC7

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    It’s not a rasp. It’s a hiss / buzz from the downpipes. Not from the rear ;)
     

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