Making exhaust pop

  1. L-plater Joined: Sep 2012 Derby Posts: 33 Saxo 1.1 (1998)
    #1
    Hi,

    I have read elsewhere about a little trick to make your exhaust pop and was just wondering whether anybody has heard/found this to be true or even whether it is plausible?

    Link: http://www.tacomaworld.com/forum/gen...haust-pop.html

    In short, apparently gluing a screw 2-3 inches into your exhaust will cause unburnt fuel to collect around it which will eventually 'pop'.

    Any thoughts?
  2. Established Member Joined: Mar 2009 derby Posts: 1276 Black 03 vtr, Yamaha R1 @185 bhp
    #2
    Seems a bit gay, my kam racing backbox pops anyway, try it see if it works and lets us know
  3. Super Moderator Joined: Nov 2009 Cambridge(ish), UK. Posts: 10581 BMW 5x M50d.
    #3
    Yes, I've got thoughts.

    I think anyone doing this is a complete penis, who needs to be dragged outside by the ballsack hair and beaten senseless.

    What a fucking STUPID idea.

    PS - it wont work.
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  4. L-plater Joined: Sep 2012 Derby Posts: 33 Saxo 1.1 (1998)
    #4
    Why is it stupid?

    Yes, I know I'm probably opening myself up for a lot of abuse here!
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  5. Established Member Joined: Jul 2011 Hampshiiiire Posts: 1710 mk2 vts, e36
    #5
    I bet you've got one of these bad boys? Am I right?

    http://www.ebay.co.uk/itm/TURBO-Exha...item19d2580890
  6. Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182
    #6
    Put a balloon over your exhaust tip, it'll pop eventually
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  7. L-plater Joined: Sep 2012 Derby Posts: 33 Saxo 1.1 (1998)
    #7
    Quote:
    Originally Posted by knight-22 View Post
    I bet you've got one of these bad boys? Am I right?

    http://www.ebay.co.uk/itm/TURBO-Exha...item19d2580890
    No but after the drive belt was tightened up a little it does a whistle.
  8. Saxperience Forum Bum Joined: Jul 2009 Kent Posts: 4207 Mango cammed furio vts
    #8
    Last person who we saw had done this got absolutely abused an left the forum pretty quickly.
  9. Saxperience Post Whore Joined: Dec 2002 United Kingdom Posts: 8390
    #9
    I always found that with a straight through exhaust and an aftermarket manifold, VTS's would pop if you changed gear at 7k.
  10. L-plater Joined: Sep 2012 Derby Posts: 33 Saxo 1.1 (1998)
    #10
    But why, that's what I want to know?
  11. Saxperience Forum Bum Joined: Sep 2011 Doncaster Posts: 2627 Fabia VRS, mk1 fiesta + some others
    #11
    he posted a vid of bmw, it didnt work on...
    stupid americans.
  12. Saxperience Forum Bum Joined: Jul 2009 Kent Posts: 4207 Mango cammed furio vts
    #12
    Do you see high performance cars with a screw in the exhaust?
  13. L-plater Joined: Sep 2012 Derby Posts: 33 Saxo 1.1 (1998)
    #13
    I don't suppose you do. I was hoping for something a bit more .. fact-y, but that'll have to do.
  14. Saxperience Forum Bum Joined: Jul 2009 Kent Posts: 4207 Mango cammed furio vts
    #14
    The fact behind it is, yes having something interrupting will have small amount of unburnt fuel and yes it is possible it will make it do little pops. Reason no one would do that is they have a proper exhaust system which would do it naturally, and tbh on a 1.1 you want it to pop/bang?
  15. Regular Poster Joined: Jan 2012 Norwich Posts: 453 Saxo Mk2 Vtr (sold) 106 gti
    #15
    My mate put gt6 injectors in his 106 gti. I pop and banged and flamed, but he couldn't stop it from doing it so he kept getting pulled
  16. Frequent Poster Joined: Feb 2009 Colwyn Bay/Southend Posts: 608 Mk2 vts VXR engined astra
    #16
    I dont understand why people want to do this, wait a couple of years, buy a turbo car then anti-lag it,
    My vts pops and bangs, gets quite annoying after a while, especially knowing that unburnt fuel is a waste
  17. Saxperience Forum Bum Joined: Nov 2009 Sawtry Posts: 3456 Saxo VTS Saxo VTR
    #17
    Quote:
    Originally Posted by Skitts123 View Post
    My mate put gt6 injectors in his 106 gti. I pop and banged and flamed, but he couldn't stop it from doing it so he kept getting pulled
    No wonder he kept popping and banging!!

    Those GTI-6 injectors must've been overfueling his car like a bitch
  18. Frequent Poster Joined: Sep 2011 alfreton Posts: 533 saxoo vtr mk1, 104bhp
    #18
    Just decat your car simple!
  19. Saxperience Post Whore Joined: Dec 2006 Maidstone Posts: 8210 Golf TDI
    #19
    Quote:
    Originally Posted by burgin2011 View Post
    Just decat your car simple!
    A decat does not mean it will pop, sure it may but not always so its not the solution.

    There is no bargain basement way to do it.

    A combination of an aftermarket Manifold, Decat and Exhaust system may do it but again, not everybody who does this gets pops and bangs.

    A superspring mani, decat and saxsport would be my suggestion.

    Causing the car to overfuel is not a good idea anyway because it could eventually lead to bore wash and cause problems with other components.
  20. Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182
    #20
    mine still pops with the cat on!
  21. Frequent Poster Joined: Sep 2011 alfreton Posts: 533 saxoo vtr mk1, 104bhp
    #21
    No im not saying it will pop your right there but will pop better and more chsnce of popping when i decatted my vtr it popped quite a lot but made a racket so i went back std lol
  22. Regular Poster Joined: Sep 2011 Hertfordshire Posts: 250 2000 Saxo Woodland Green VTS, 2002 Mazda MX5
    #22
    charliechops_x as its been said popping and banging is caused by unburnt hydrocarbons (fuel between those who don't know what fuel is) within the exhaust system.

    There are a number of reasons why you'll get unburnt hydrocarbons in the exhaust such as overfuelling, engine breathing restrictions, engine scavaging issues due to valve timing incorrect, bore wash, faulty lambda readings causing over fuelling etc.

    Fuel burns at around 1000deg.C (not saying this is 100% accurate google it if you want the ignition temp of fuel, obviously it changes with octane level).

    There are a few ways in which you getting popping two being:

    1) When the engine rotates faster the combustion process is shortened because the piston is accelerating up and down the cylinder faster. Fuel and air burn at a certain speed, from the spark plug (ignition point) across the combustion chamber this is know as the flame front this sweeps across the cylinder much like throwing a stone into water (ripples). At 7K rpm the flame front has less time to burn the entire mixture within the engine before the exhaust valve opens, however you can't control how quickly fuel burns (where talking milliseconds here but equate that to how quickly your piston is running up and down the cylinder then is seems quite slow). Occasionally the mixture is still burning as the exhaust valve is opening, this gives you the pop as the mixture is still combusting but the sound is traveling down the exhaust. Due to the exhausts shape and size the sound is resonated down the exhaust system creating a much louder bang.

    This is one method alternatively:

    2)Although the above is NOT the only way to get popping and banging in the exhaust occasionally overtime unburnt fuel droplets build up on the exhaust downpipe walls. These are previous unburnt hydrocarbons that were originally in a vapour state/form within the combustion chamber however as the exhaust temperature is lower than the combustion chamber the fuel state changes from vapour to droplets. Carbon is a sticky substance and sticks to pretty much anything in droplet state, if you don't believe me then have a look at my valve ports on my VTS engine:



    As i'm sure you know the faster you go the hotter the engine gets as does the exhaust, occasionally the temperature within the exhaust is sufficient to ignite these wall droplets giving you pops bang and from time to time flames out the back of the car.

    So there's the science behind it there are probably a few other ways to get it, point is you don't want this in your engine as some of the others mentioned on here it'll create all sorts of reliability issues

    !Apologies if there's some grammar or spelling issues i'm at work!
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  23. Super Moderator Joined: Nov 2009 Cambridge(ish), UK. Posts: 10581 BMW 5x M50d.
    #23
    Quote:
    Originally Posted by Wee_monkey1987 View Post
    charliechops_x as its been said popping and banging is caused by unburnt hydrocarbons ...


  24. Regular Poster Joined: Sep 2011 Hertfordshire Posts: 250 2000 Saxo Woodland Green VTS, 2002 Mazda MX5
    #24
    Quote:
    Originally Posted by Ross View Post


    he did ask!
  25. Super Moderator Joined: Nov 2009 Cambridge(ish), UK. Posts: 10581 BMW 5x M50d.
    #25
    Quote:
    Originally Posted by Wee_monkey1987 View Post
    he did ask!
    I'm only teasing I did actually read it all. Promise!
  26. Regular Poster Joined: Sep 2011 Hertfordshire Posts: 250 2000 Saxo Woodland Green VTS, 2002 Mazda MX5
    #26
    don't worry about it don't think my boss will be too impressed though just spent 15mins writing and checking that makes sense oops!
  27. L-plater Joined: Sep 2012 Derby Posts: 33 Saxo 1.1 (1998)
    #27
    Thanks, that was what I was looking for.

    Im a lady btw :-) seeking info on behalf of my boyfriend as its his car, im just the brains behind the brawn (ha!)
  28. Saxperience Post Whore Joined: Mar 2009 Uppingham, Rutland Posts: 9569 mk1 JP4'd VTR, '16 Fabia Monte Carlo
    #28
    no offense but putting screws in your 1.1 exhasut isnt exactly what you'd describe as using your brain lol

    hes got a 1.1 he should be wanting to draw the least amount of attention towards him
  29. Regular Poster Joined: Jan 2006 Ilkeston, Derbyshire Posts: 469 374 bhp Supercharged 205 GTI, Passat Estate
    #29
    screws work for me

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  30. Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut
    #30
    Quote:
    Originally Posted by charliechops_x View Post
    Thanks, that was what I was looking for.

    Im a lady btw :-) seeking info on behalf of my boyfriend as its his car, im just the brains behind the brawn (ha!)
    Use those brains and don't do stupid things to impress the Maccy D carpark brigade
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  31. Infrequent Poster Joined: Oct 2009 Posts: 239 106 GTI
    #31
    Screws are ok, but Chilli Sauce works the best I reckon..

  32. Regular Poster Joined: Nov 2010 Nottingham Posts: 293 205gti 1.9
    #32
    Quote:
    Originally Posted by xsi16v View Post
    screws work for me

    a rev limiter and a supercharger help though don't they
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  33. L-plater Joined: Sep 2012 Wokingham Posts: 32 Saxo eastcoast 1.1
    #33
    I just brought a new sportex exhaust system from cat back and after a week it pops and bangs nothing else done to it but after a while it gets annoying, but does sound kinda nice.
  34. Frequent Poster Joined: Mar 2011 North East Posts: 743
    #34
    Mine bangs...



    On speedbumps.
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  35. Regular Poster Joined: Sep 2011 Hertfordshire Posts: 250 2000 Saxo Woodland Green VTS, 2002 Mazda MX5
    #35
    Quote:
    Originally Posted by charliechops_x View Post
    Thanks, that was what I was looking for.

    Im a lady btw :-) seeking info on behalf of my boyfriend as its his car, im just the brains behind the brawn (ha!)
    whoops sorry thought you were a dude! - pretty random for a guys gf to be asking that sort of info?

    Quote:
    Originally Posted by jeffchiz View Post
    no offense but putting screws in your 1.1 exhasut isnt exactly what you'd describe as using your brain lol
    wish this forum had a like button mega lol!
  36. Saxperience Hardcore! Joined: Mar 2008 Posts: 31279 Citroen Saxo VTS, S60 D5
    #36
    Mine pops when going down gears sometimes (cat in). Does it going up gear aswell, again sometimes.

    Sometimes its so annoying :/
  37. Infrequent Poster Joined: Apr 2011 Posts: 224 106 Indepedence with 1.6 vtr , 106 1.0 96 Runabo
    #37
    lool at gluing bolts on ur exhaust surely the glue would just melt...

    Anyway to get it to over feul you could unplug the MAP sensor or one of the lambda sensors and it should pop might be a nit smokey and not great for your engine but better then gluing stuff to your exhaust lol
  38. Regular Poster Joined: Nov 2010 Nottingham Posts: 293 205gti 1.9
    #38
    if you want something in your exhaust to cause popping remove it and get a welder to ark in it with the wire an inch or so long, then cut the wire to release the torch leaving said wire to glow when hot enough (just make sure it far enough down the tube that you can reassemble the exhaust after
  39. Saxperience Forum Bum Joined: May 2011 huddersfield Posts: 2635 ph3'd c2 gt
    #39
    or an omex revlimiter
    sorry bout posting this picture everywhere but i love it!

  40. Established Member Joined: Jan 2011 Aylesbury Posts: 1868 Seat Leon Cupra tdi
    #40
    http://www.ebay.co.uk/itm/Exhaust-Fl...ht_1173wt_1059
  41. Infrequent Poster Joined: Oct 2009 Posts: 239 106 GTI
    #41
    Quote:
    Originally Posted by Ali123 View Post
    or an omex revlimiter
    sorry bout posting this picture everywhere but i love it!
    oooo pretty colours
  42. Saxperience Forum Bum Joined: May 2011 huddersfield Posts: 2635 ph3'd c2 gt
    #42
    Quote:
    Originally Posted by martyno View Post
    oooo pretty colours

    oh indeed they are!
  43. Saxperience Hardcore! Joined: Nov 2007 Guantanamo Bay Posts: 28700 oyster card
    #43
    Quote:
    Originally Posted by Skitts123 View Post
    My mate put gt6 injectors in his 106 gti. I pop and banged and flamed, but he couldn't stop it from doing it so he kept getting pulled
    Quote:
    Originally Posted by lwigmore View Post
    No wonder he kept popping and banging!!

    Those GTI-6 injectors must've been overfueling his car like a bitch
    Correct me if im wrong, but simply putting in larger CC injectors doesn't mean its injecting more fuel. It will be injecting the same amount of fuel as with saxo injectors or even 1.1 injectors. The larger CC just means its capable of injecting more fuel if its told to do so?

    So on a standard VTS engine, putting in larger CC injectors will work exactly the same as before. But if the engine requires more fuel at a higher CC than what the standard VTS injectors are capable of delivering then the engine will benifit from the larger CC injectors from say a GTI6 etc.

    Its like saying the 5th gear matched with my final drive is geared to make my car go 240mph. Far from it, the 5th gear is capable of it, but just because its got a higher capability of a higher speed doesnt mean the saxo is now going to reach that top speed of 240mph.
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  44. Saxperience Forum Bum Joined: Mar 2011 plymouth Posts: 2921 mk2 VTS
    #44
    just take the mani and exhaust off then the bastard will pop or set the cunt on fire with the windows wound up
  45. Saxperience Hardcore! Joined: Nov 2005 Coventry Posts: 17782 Fiesta ST150
    #45
    Mine pops when I go off the accel pedal, 60 in 5th let go of accel and listen to it poppin
  46. Infrequent Poster Joined: Jun 2012 Newcastle Posts: 188 1.1 Saxo Desire
    #46
    Saw your backbox off
  47. Saxperience Forum Bum Joined: Jul 2010 South Wales Posts: 3078 ZX 16v, 205 GTI, 309 Goodwood, 405 MI16.
    #47
    Quote:
    Originally Posted by Mochachino View Post
    Correct me if im wrong, but simply putting in larger CC injectors doesn't mean its injecting more fuel. It will be injecting the same amount of fuel as with saxo injectors or even 1.1 injectors. The larger CC just means its capable of injecting more fuel if its told to do so?

    So on a standard VTS engine, putting in larger CC injectors will work exactly the same as before. But if the engine requires more fuel at a higher CC than what the standard VTS injectors are capable of delivering then the engine will benifit from the larger CC injectors from say a GTI6 etc.

    Its like saying the 5th gear matched with my final drive is geared to make my car go 240mph. Far from it, the 5th gear is capable of it, but just because its got a higher capability of a higher speed doesnt mean the saxo is now going to reach that top speed of 240mph.
    no, you are VERY wrong.


    fitting larger injectors WILL make it overfuel, massively in this case due to the size of gti6 injecotrs.

    all the ecu will do it open the injectors a predetermined MS (millisecond) according to the load recorded by the load sensors, comparing against a predetermined map held in the ecu, using the lambda and knock sensors where applicable to adjust the fuel and/or ignition a small amount either side.

    the ecu cannot know how much too much fuel will be going through (it'll be around 50%!!) all it will know due to the narrowband lambda is that it is running rich, and will try and pull it back, but only a certain amount determined by the ecu, as its meant to work within that percentage, because its meant to have the smaller injectors...



    basically, you will kill an engine without a remap.