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The current obsession with popping exhausts

Discussion in 'Motors' started by lordrobs, Apr 17, 2019.

  1. Jamesyboyjim


    Joined: Oct 30, 2008

    Posts: 3,005

    Location: South

    A few pops and bangs that catch you by surprise are great fun, but yes, I do agree these maps people have put on to increase the pops and bangs are a bit overkill, especially as these are peoples daily drivers so are driven around built up areas regularly and started up early doors everyday. If it was just on someones 'fun car' that goes out on nice days then I'd say go crazy. but not at 6am weekdays please :p
  2. Conscript


    Joined: Oct 18, 2004

    Posts: 8,978

    Location: Kent

    Doesn't forcing cars to do this damage the cat?
    My understanding is the noise is caused by unburnt fuel getting ejected through the exhaust port and then igniting in the hot exhaust itself, hence why is happens on high revving gear changes or overrun.
    If manufacturers are mapping the engine to do this on purpose, aren't they shortening the life of the cat? Or is the potential for damage just minimal?
  3. Gaijin


    Joined: Feb 18, 2003

    Posts: 8,411

    Location: Brighton/West Wicklow

    All too common i'm afraid. Mine pops once or twice often on sudden lift/overrun but so many people get "pops and bangs" mapped in. I think someone has attempted it on mine at least in part in the past as the ignition table has a lump of retarded timing at low loads:


    From looking at it briefly, despite having a lot of the hardware requirements (secondary air system etc.) it would need other settings changed in the ECU and arguably more ign retard. Would also need to pipe the BOV back to recirc from VTA as well apparently. Needless to say, it's not on the agenda.

    For me - each to their own I guess but I think it's a bit cringe. Go full anti-lag (and have a yearly turbocharger budget to suit) or go home.
  4. agw_01


    Joined: Apr 11, 2004

    Posts: 19,382

    A few random pops when the exhaust is hot is perfectly normal and can sound really good, my Nur Spec does it and I love it. Very occasionally it'll let off a pop that sounds like a shotgun, great fun.

    The issue is when an exhaust pops and bangs 17 times per gear change or even under normal non-spirited driving. They're mapped in and will pop and bang in the exact same way each time. Sounds fake, boring and repetitive.
  5. Hyburnate


    Joined: Jul 29, 2011

    Posts: 14,175

    Location: NN4

    Yep it sounds stupid.

    My Abarth did it when giving it the beans and the i30N does the same. Yeah it's a little burbly when driving around but nothing quite like popping...
  6. Em3bbs


    Joined: Dec 26, 2011

    Posts: 4,377

    Location: City of London

    Our X3 M40i does it in sports mode and personally I like it. It's funny people looking around expecting to see a supercar or something but it's just me in a family wagon. :D


    i also find it amusing that we have a 440i with the same engine and it's no where near as loud, and no pops.
  7. Conscript


    Joined: Oct 18, 2004

    Posts: 8,978

    Location: Kent

    Your car has bronchitis.
  8. Tee Hee Johnson


    Joined: May 30, 2007

    Posts: 3,869

    Location: Glasgow, Scotland

    Pops make me sad :(

    Although I do get a physical laugh when they go pop!
  9. Diddums


    Joined: Oct 24, 2012

    Posts: 17,850

    Location: London

    The thing is with this is it suffers from the same problems as fake M / RS / AMG badges. Those who know, know it's fake and therefore you look a prat, and those who don't know, don't care, until someone points it out, then you look a prat too.

    So in short, you look a prat, unless you're trying to impress the CorsaKids™ at McDonalds on their mopeds.
  10. Kreeeee

    Man of Honour

    Joined: Jul 13, 2004

    Posts: 41,262

    Location: /* */

    I've always found it weird that exhaust noise isn't restricted in the UK like it is in the rest of the EU. I always notice the obnoxious exhausts when I visit the UK.
  11. Raymond Lin

    Capo Crimine

    Joined: Oct 20, 2002

    Posts: 62,864

    Location: Wish i was in New York

    My C30 T5 don’t pop at all...all I hear is the turbo. Unlike the mk2 ST, it sounds much quieter.

    EDIT - I actually thought about this last year when the new Mini came out with the launch control switch thing and how the new Abarth 595 sounds beefier than my car with 1 less cylinder and smaller engine.
    Last edited: Apr 17, 2019
  12. robinbanks


    Joined: Feb 18, 2012

    Posts: 231

    Location: witney

    I just find it funny. I would have thought it wouldn't to too healthy for the engine. Anyway what's the idea behind it? They trying to copy the sound of anti lag?
  13. Minstadave


    Joined: Jan 8, 2004

    Posts: 24,249

    Location: Rutland

    Ugh. That's just wrong.
  14. Minstadave


    Joined: Jan 8, 2004

    Posts: 24,249

    Location: Rutland

    Its just overfuelling isn't it causing detonation in the exhaust.
  15. acemastr


    Joined: May 29, 2010

    Posts: 4,505

    Location: Tampa, Florida

    My bike shoots a 2 foot blue flame out the back with a loud bang when I let off and then get back on it... my dad's bike has the air intake system still enabled and it flows air into the exhausts and pops like an idiot, non stop popping on overrun... it's silly.
  16. Vita


    Joined: Mar 26, 2006

    Posts: 10,562

    Location: United Kingdom

    The focus st I owned popped. You could make it do it on demand by dipping the clutch and revving or have a tuning map to do it on overun.

    It was cool at first but the novelty wore off.
  17. ttaskmaster


    Joined: Sep 11, 2013

    Posts: 8,156

    Location: Reading, UK

    It just sounds stupid.
    The only times an engine of mine ever popped was when I put custom pipes on the bike and didn't tweak the carbs to compensate, followed by another bike that got a hole in the exhaust. It's the sound of a broken, badly maintained and badly driven vehicle, to my mind.

    I could appreciate the VRRROOOOMMMM-TSSHHHHHHH of a dump valve or something, but the popping is just retarded.
    Now that Crazy Frog is basically as old-fashioned as black and white movies, I assume it's what the cool kids like these days instead of having their phones just go "RRRRIIIIIIINGGGGG-DI-DI-DI-DI-DI-DIIIINNNNNNGGGGGG-DING-DING".....?

    It kind-of is... MoT testers can cite your vehicle if the exhaust is too loud and put it down as a major defect. I believe the UK legal limit on pipes is 82dB, or something?
  18. 200sols

    Wise Guy

    Joined: Jan 14, 2018

    Posts: 1,797

    Location: Hampshire

    They are looking around and trying to find the end of the bell.
  19. Hyburnate


    Joined: Jul 29, 2011

    Posts: 14,175

    Location: NN4

    My car is louder than that stock? Like per the V5?
  20. grudas


    Joined: Mar 12, 2008

    Posts: 19,988

    Location: West sussex

    it is, 82db is the "legal" limit but also "any louder than standard" is also illegal but even factory cars are often louder than that, you gotta be taking the micky to get pulled for it.

    I know a civic recently got pulled over and done for by coppers but his measured at 129DB which is crazy loud.

    my s2000 is probably around 100-102db on full chat and that is more than loud enough. 129db(and keep in mind db scale is not linear) is as loud as military jet taking off.