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Discussion in 'Motors' started by Will Gill, Jun 16, 2005.

  1. Nasher

    Capodecina

    Joined: Nov 22, 2006

    Posts: 12,478

    So they convert more engine power in to extra noise when they open. They have no real mechanical purpose (such as reducing back pressure) and it's just a valve with a motor on it connected to the button, so fake :p
     
    Last edited: Dec 27, 2018
  2. Joe T

    Capodecina

    Joined: Apr 1, 2003

    Posts: 11,332

    Location: Northampton

    No.
     
  3. theone8181

    Mobster

    Joined: Mar 27, 2013

    Posts: 3,300

    Proper supercar exhaust, split flow but only a single pipe either side (I'm assuming quads are single pipe on each side as well, there's a choice of either single or twin on either side).IMGhttps://cdn.shopify.com/s/files/1/0093/4292/products/PERP9634KITX-PERP9634KITXFLAP_1400x.png?v=1512918180

    ** Do Not hotlink images **
     
    Last edited by a moderator: Dec 27, 2018
  4. Diddums

    Capodecina

    Joined: Oct 24, 2012

    Posts: 18,287

    Location: London

    I've noticed over the last year that the butterfly valves in many quads are visible in the exhaust tips, is there a reason for this? My only thought is ease of access
     
  5. Kenai

    Capodecina

    Joined: Apr 5, 2009

    Posts: 17,800

    Sometimes it's better to just stop digging.
     
  6. Nasher

    Capodecina

    Joined: Nov 22, 2006

    Posts: 12,478

    Prove me wrong then. Lets see dyno readings with them open vs closed :)
     
  7. Kenai

    Capodecina

    Joined: Apr 5, 2009

    Posts: 17,800

    I see you've opted for the excavator instead.
     
  8. layte

    Wise Guy

    Joined: Jun 14, 2008

    Posts: 2,304

    Changes how the car sounds along with grin inducing pops and crackles now means completely fake and not doing anything.
     
  9. Frozennova

    Man of Honour

    Joined: Nov 13, 2009

    Posts: 11,106

    Location: Northampton

    I suggest you put some books on your Christmas list next year as you're clearly clueless on how a car actually works
     
  10. Nasher

    Capodecina

    Joined: Nov 22, 2006

    Posts: 12,478

    So you think quad pipes (via a single pipe from the manifold) on a 4 cyl engine have any benefit whatsoever? lol
     
  11. Diddums

    Capodecina

    Joined: Oct 24, 2012

    Posts: 18,287

    Location: London

    Science tiemz!

    Take a pipe. Split it in four. Now blow through it. Then block two holes and blow again. Notice a difference? That's how exhausts work.
     
  12. Nasher

    Capodecina

    Joined: Nov 22, 2006

    Posts: 12,478

    Only if your using 4 separate pipes. Otherwise it's only going to flow as quickly as the mid section allows.
     
  13. Diddums

    Capodecina

    Joined: Oct 24, 2012

    Posts: 18,287

    Location: London

    What if the four pipes are exactly 1/4 of the flow of the center pipe? Therefore shutting each pipe restricts the flow by 25%?
     
  14. Nasher

    Capodecina

    Joined: Nov 22, 2006

    Posts: 12,478

    Then it would probably help, but they aren't. It will be a 2.5" or 3" pipe all the way down which is pretty standard.
     
  15. Frozennova

    Man of Honour

    Joined: Nov 13, 2009

    Posts: 11,106

    Location: Northampton

    Yes, because there more engineering reasons for 4 tips than just whether it flows well enough to no pose a restriction
     
  16. Nasher

    Capodecina

    Joined: Nov 22, 2006

    Posts: 12,478

    The reason is "looks sick innit bruv". Also to get a nice sound while still being inside legal limits. But you could change the back box to a single outlet and see no difference to performance.

    In fact you'll probably find the really high end, custom made race spec exhausts do just that as it saves weight.
     
    Last edited: Dec 27, 2018
  17. Simon

    Capodecina

    Joined: Oct 21, 2002

    Posts: 22,476

    Location: Berks / Moscow

    But won’t be road legal
     
  18. Acme

    Caporegime

    Joined: Jul 29, 2011

    Posts: 30,178

    Location: Acme's chair

    Uhh
     
  19. Simon

    Capodecina

    Joined: Oct 21, 2002

    Posts: 22,476

    Location: Berks / Moscow

    What. He’s talking about exhausts with no purpose yet the point of it being made to be compliant with road noise drive by and enable two modes of noise seems to be missed.

    A race exhaust would make more power but won’t ever be allowed to be standard fit.

    At least the tailpipes are connected to the exhaust. Some cars don’t even do that !
     
  20. G-MAN2004

    Caporegime

    Joined: Jul 4, 2004

    Posts: 29,484

    No pic, but saw a Seat Ibiza today with the plate BE09 XXX :cool: