Boy Racers Air Actuated Clutches?

Green Hornet

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 ) 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?

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

HungryJoey

Air actuated clutches, lol Sorry...

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

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:

colm_mcm

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

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 .

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 .

You may have been wrong, but I like your thinking!

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 .

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:

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

tuxy

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

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

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..

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

Masada

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

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

Holsten

Wub the sound of a dump valve.

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.

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.

Anan1

vtec wrote: »

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

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.

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 ) 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.

Esel

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

colm_mcm

classy guy.

I think this thread is over now.

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!

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...

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

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

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!

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

colm_mcm

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

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

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

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.

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

Green Hornet

conneem-TT wrote: »

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

:D:D

Fozzie Bear

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 ) 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?

Pass no heed of them hornet, shower of big bullies. I can see where you are coming from with the clutch thing. Obviously you heard the pisssst sound when the car was changing gear and assumed it was to do with the clutch. I hadn't a clue what the hell it was either for a long time and used to stare at the Glanza making it as it tore off up the street, all aerials and blue luminous under lighting with the standard skobie looking fecker behind the wheel. Just like everyone else on here i had to ask/learn/look it up to find out what it was and like most on here i looked stoopid when i asked.

Green Hornet

Fozzie Bear wrote: »

Pass no heed of them hornet, shower of big bullies. I can see where you are coming from with the clutch thing. Obviously you heard the pisssst sound when the car was changing gear and assumed it was to do with the clutch. I hadn't a clue what the hell it was either for a long time and used to stare at the Glanza making it as it tore off up the street, all aerials and blue luminous under lighting with the standard skobie looking fecker behind the wheel. Just like everyone else on here i had to ask/learn/look it up to find out what it was and like most on here i looked stoopid when i asked.

Yep. That was it Fossie. Assumed it was to do with the clutch because it coincided with the gear change.

You learn something new every day I suppose .

peasant

here's your air actuated clutch (@0.32)

https://www.youtube.com/watch?v=_BquiLEp5Ro