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Boy Racers Air Actuated Clutches?

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  • 24-06-2008 11:50pm
    #1
    Green Hornet
    Closed Accounts Posts: 3,305 ✭✭✭


    I guess I'm illustrating my lack of knowledge now but what the hell is the story with the air brake sound that the toy racers (sorry..boy racers :D) seem to have on their Starlets (sorry......Glanza's) every time they use the clutch. I assume its some kind of air actuated clutch? If it is an air actuated clutch what is the advantage over a regular clutch?


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    #2
    colm_mcm
    Registered Users Posts: 73,390 ✭✭✭✭colm_mcm


    that's called a dump valve or blow off valve

    http://en.wikipedia.org/wiki/Dump_valve

    http://en.wikipedia.org/wiki/Blow_off_valve


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    #3
    HungryJoey
    Registered Users Posts: 2,192 ✭✭✭HungryJoey


    Air actuated clutches, lol :o Sorry...

    Yeah, that'd be the dumpvalve your hearing.. pitshhhh


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    #4
    astraboy
    Closed Accounts Posts: 1,034 ✭✭✭astraboy


    "Air activated clutch"?!:D Ahahahahahahahah! Good grief if your going to slag off a group of people at least get the terminology right! Its a dump valve, used to reduce pressure in the turbo during large drops in revs, like in gear changes. Helps to improve turbo life.

    And let the sterotyping about boy racers and anyone driving a Glanza begin....:rolleyes:


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    #5
    colm_mcm
    Registered Users Posts: 73,390 ✭✭✭✭colm_mcm


    or in some cases, a speaker that makes a dump valve type sound!


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    #6
    Green Hornet
    Closed Accounts Posts: 3,305 ✭✭✭Green Hornet


    colm_mcm wrote: »
    that's called a dump valve or blow off valve

    http://en.wikipedia.org/wiki/Dump_valve

    http://en.wikipedia.org/wiki/Blow_off_valve

    Thanks Colm. Looks like I'm a bit of an idiot for asking a stupid question but hell, if you dont ask you'll never know :o.


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    #7
    Anan1
    Registered Users Posts: 22,818 ✭✭✭✭Anan1


    Green Hornet wrote: »
    Thanks Colm. Looks like I'm a bit of an idiot for asking a stupid question but hell, if you dont ask you'll never know :o.
    You may have been wrong, but I like your thinking!


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    #8
    DonJose
    Registered Users Posts: 3,470 ✭✭✭DonJose


    Green Hornet wrote: »
    Thanks Colm. Looks like I'm a bit of an idiot for asking a stupid question but hell, if you dont ask you'll never know :o.

    Nothing wrong with asking a question, just funny to see the smart assed answers AFTER the question has already been answered by Colm Mcm :rolleyes:


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    #9
    s14driftking
    Registered Users Posts: 646 ✭✭✭s14driftking


    its a dump valve these cars seem to make boost very early hence the reason there always going off
    ive them fitted on my silvias but they never go off till the turbo is boosted at over 4 thousand revs


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    #10
    tuxy
    Closed Accounts Posts: 14,983 ✭✭✭✭tuxy


    Damn, someone stole your idea green hornet. :(
    http://www.freepatentsonline.com/6935474.html


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    #11
    Green Hornet
    Closed Accounts Posts: 3,305 ✭✭✭Green Hornet


    tuxy wrote: »
    Damn, someone stole your idea green hornet. :(
    http://www.freepatentsonline.com/6935474.html
    Thanks Tuxy. At least now I dont feel as stupid!

    Funny thing is that there are probably other people out there who didn't know what caused the sound either. Or maybe not......................:o


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    #12
    HungryJoey
    Registered Users Posts: 2,192 ✭✭✭HungryJoey


    DonJose wrote: »
    Nothing wrong with asking a question, just funny to see the smart assed answers AFTER the question has already been answered by Colm Mcm :rolleyes:

    Thanks :rolleyes:No seriously I couldn't resist..

    In fairness, it wasn't a bad question, it was quite a good one. It was just a very funny way of calling it.. seriously it made me laugh.. No offence!! :)

    Just out of curiosity, how did you come up with that name ? :eek: It sounds so clever..


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    #13
    woop
    Registered Users Posts: 809 ✭✭✭woop


    look a dump valve is fairly well known terminology wouldnt take a mastermind to know what it is(not directed at green hornet)

    fair play for asking though, nobody learns by not asking questions
    dump valves dont neccesarily make that pshh noise though


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    #14
    Masada
    Banned (with Prison Access) Posts: 11,001 ✭✭✭✭Masada


    Hahaha., air actuated clutches., thats a beauty., :D

    sorry, ill move on to laughing at someone else soon., lol


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    #15
    Holsten
    Registered Users Posts: 4,971 ✭✭✭Holsten


    Wub the sound of a dump valve.


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    #16
    klaus23
    Registered Users Posts: 179 ✭✭klaus23


    Ah leave the lad alone, I explained the same thing to my GF who referred to the cars that sneezed.

    When she pointed out - correctly, and to my surprise - that only the smaller turbocharged cars seemed to make this obvious sound, I explained that for reasons far too long - not to mention the concept of forced induction compression - to explain here they are one of a few options used to reduce turbo lag time and seem to be popular with our younger modders because they make noise, I instead went and showed her how to left-foot brake on a beach, a la Walther Rohrl.


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    #17
    peasant
    Registered Users Posts: 17,819 ✭✭✭✭peasant


    In fairness to the OP, the Swiss truck manufacturer Saurer were putting pneumatically assisted clutches into their trucks long before a dump valve was ever even thought of.


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    #18
    Anan1
    Registered Users Posts: 22,818 ✭✭✭✭Anan1


    vtec wrote: »
    Hahaha., air actuated clutches., thats a beauty., :D

    sorry, ill move on to laughing at someone else soon., lol
    It's actually pretty good reasoning for someone who doesn't know what a dump valve is, IMO.


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    #19
    S.I.R
    Closed Accounts Posts: 2,837 ✭✭✭S.I.R


    Green Hornet wrote: »
    I guess I'm illustrating my lack of knowledge now but what the hell is the story with the air brake sound that the toy racers (sorry..boy racers :D) seem to have on their Starlets (sorry......Glanza's) every time they use the clutch. I assume its some kind of air actuated clutch? If it is an air actuated clutch what is the advantage over a regular clutch?

    they use 2/3 port dump valves.... on cars with at best.... 7.... maybe 7.5 psi ?


    dont mind them, boys will be boys, All bark-no b****.... etc.


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    #20
    Esel
    Registered Users Posts: 22,035 ✭✭✭✭Esel


    I usually lock the door before using my dump valve. It sometimes makes that Ptshhh sound when equalising the pressure too. :D

    Not your ornery onager



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    #21
    colm_mcm
    Registered Users Posts: 73,390 ✭✭✭✭colm_mcm


    classy guy.

    I think this thread is over now.


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    #22
    Beta Ray Bill
    Registered Users Posts: 3,542 ✭✭✭Beta Ray Bill


    Guys we are all forgetting the point here

    A dump valve makes your car go faster (at least 1000bhp) and makes your cool looking car... sound cool too! LOL

    Yeah I hate them to be honest It's not even a good solution to the problem. Recirculation or waste gate is better :) and its not as noisey

    Also I don't like em as it gives the "impression" that the car is going faster than it actually is... and the "curtain twitchers" will be going Joe 90!


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    #23
    TwoShedsJackson
    Closed Accounts Posts: 9,438 ✭✭✭TwoShedsJackson


    astraboy wrote: »

    And let the sterotyping about boy racers and anyone driving a Glanza begin....:rolleyes:


    In fairness anyone who drives a car that's named after a part of the penis can probably be looked down upon...


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    #24
    Beta Ray Bill
    Registered Users Posts: 3,542 ✭✭✭Beta Ray Bill


    TwoShedsJackson wrote: »
    In fairness anyone who drives a car that's named after a part of the penis can probably be looked down upon...

    GAS :D


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    #25
    DemonOfTheFall
    Closed Accounts Posts: 2,279 ✭✭✭DemonOfTheFall


    Wouldn't hold anything against a boy racer for having a dump valve...

    Would hold a lot against the 90% of cars that make dump valve noises that are just fake dump valves though :)


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    #26
    Green Hornet
    Closed Accounts Posts: 3,305 ✭✭✭Green Hornet


    DemonOfTheFall wrote: »
    Wouldn't hold anything against a boy racer for having a dump valve...

    Would hold a lot against the 90% of cars that make dump valve noises that are just fake dump valves though :)
    How do you mean?
    Do you mean that some guys buy some kind of "system" that just gives off the noises without actually doing anything?
    Thats pretty sad alright!


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    #27
    DemonOfTheFall
    Closed Accounts Posts: 2,279 ✭✭✭DemonOfTheFall


    Yeah exactly. Don't know how it makes its noises or what but there are systems they install that make the psssssht on every gear change


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    #28
    colm_mcm
    Registered Users Posts: 73,390 ✭✭✭✭colm_mcm


    here's a fake one:
    http://www.youtube.com/watch?v=G0XGVBecRkE

    http://www.youtube.com/watch?v=md_Av9rUuEw&feature=related


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    #29
    conneem-TT
    Registered Users Posts: 437 ✭✭conneem-TT


    You'd get more pleasure fitting out of fitting something like this, but it would probably get you in alot of trouble :)

    http://www.youtube.com/watch?v=BGYcnYLK_50&feature=user


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    #30
    Gumbo
    Moderators, Society & Culture Moderators Posts: 38,549 Mod ✭✭✭✭Gumbo


    grahambo wrote: »
    Guys we are all forgetting the point here

    A dump valve makes your car go faster (at least 1000bhp) and makes your cool looking car... sound cool too! LOL

    Yeah I hate them to be honest It's not even a good solution to the problem. Recirculation or waste gate is better :) and its not as noisey

    Also I don't like em as it gives the "impression" that the car is going faster than it actually is... and the "curtain twitchers" will be going Joe 90!

    Dont forget graham that your evo is a recirculating system, but some cars do vent to atmosphere, so recirculating wont be the best option for them such as Glanza's or Sti imprezas.

    i had one on my evo for a week but it didnt take to it well, kept cutting out when you let off the gas, wasnt worth the hassle of fitting a stabilising set to control the thing so i settled for reversing the standard plastic recirculating valve.


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    #31
    conneem-TT
    Registered Users Posts: 437 ✭✭conneem-TT


    kceire wrote: »
    Dont forget graham that your evo is a recirculating system, but some cars do vent to atmosphere, so recirculating wont be the best option for them such as Glanza's or Sti imprezas.

    i had one on my evo for a week but it didnt take to it well, kept cutting out when you let off the gas, wasnt worth the hassle of fitting a stabilising set to control the thing so i settled for reversing the standard plastic recirculating valve.

    Yeah, my engine was designed for a recirculating diverter valve also and the use of an atmospheric valve will cause a rich fuel mixture due to the loss of already metered air which the ECU is expecting to remain in the system. When the air is vented, the ECU dumps fuel into the system expecting the air to be there, and it's not. This rich fuel condition can sometimes be severe enough that the ECU cannot compensate for the condition and the car will run rough or not idle properly :)


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