View Poll Results: good or bad
Voters: 44. You may not vote on this poll
are dump valves good or bad?
04-06-2006 | 08:03 PM
#41
0-60 in 17 seconds (eek)
Joined: Apr 2004
Posts: 6,717
Likes: 0
From: Berkshire
Originally Posted by Thrush
Originally Posted by frog
Thrush: top explanation 
I try!Just annoys me when youngsters who have no clue what they are actually talking about come on giving it all like they DO know what they are talking about
04-06-2006 | 10:41 PM
#42
Borg Warner EFR Equipped!
Joined: Apr 2005
Posts: 5,810
Likes: 2
From: In the unit, building a 450bhp Time Attack Focus!
Originally Posted by Oranoco
Is that for the S2 or something else?
If so - then yes, it's for the S2 - but it's not a CVH engine it's going on - it'll be a 8.5:1 comp, steel bottomed 2.0 Zetec with a GT28RS turbo
05-06-2006 | 03:45 AM
#44
PassionFord Post Troll
Joined: Jun 2003
Posts: 2,644
Likes: 0
From: cumbria
not this old dog again ok here we go.. if you dont like them dont put one on simple.. as stated if you look into how thay work thay should help the turbo from stalling..
iv had one of stu,s on for fookin years with absolutly no probs
but on the s2 you must use his electronic box, and i can turn it off and on from inside the car, and it still chatters with it on, i was told by castle that thay were first put on rally cars so thay cud change gear faster.. i mean if the compresser doesent try and stall in between gears then in theary you should be able to change gear faster..if you think about it , it makes sence..thats the theary anyway, i dont think its correct for peeps to say ther crap,
andy..
ok here we go.. if you dont like them dont put one on simple.. as stated if you look into how thay work thay should help the turbo from stalling..iv had one of stu,s on for fookin years with absolutly no probs
but on the s2 you must use his electronic box, and i can turn it off and on from inside the car, and it still chatters with it on, i was told by castle that thay were first put on rally cars so thay cud change gear faster.. i mean if the compresser doesent try and stall in between gears then in theary you should be able to change gear faster..if you think about it , it makes sence..thats the theary anyway, i dont think its correct for peeps to say ther crap,
andy..
05-06-2006 | 10:38 AM
#46
PassionFord Post Troll
Joined: Apr 2004
Posts: 3,216
Likes: 0
From: Melbourne, Australia
Originally Posted by Mr S1
Man my S1 is wikid wiv a dump valv guy........I is flexin' wiv one ma car and da chiks dig it ya no ?
FFS
- another one who hasn't got a clue telling us all the facts of life when he really should do research before posting
FFS
- another one who hasn't got a clue telling us all the facts of life when he really should do research before posting
Originally Posted by Thrush
Originally Posted by COSSIE CAL
my dump valve fell of yesterday(lost)so i now hate them 
Your dumpvalve fell off, and for that reason you hate them? Shouldn't hate yourself for being such a tool you can't secure one to your car properly?
On a side note, did it fall off while you were driving? How did you get the car home again, as you would have had a major air leak without the dumpvalve in it's place and the engine wouldn't run
I have no idea about the thread
My cossie had a wooshing one that used to hiss annoyingly at about 80mph constantly with every little blip of the throttle.
05-06-2006 | 12:12 PM
#48
DEYTUKURJERBS
Joined: Apr 2004
Posts: 29,378
Likes: 1
From: North Korea
Originally Posted by Thrush
Thats logic for you. Lets have a look at why the dumpvalve was invented shall we? And no, it wasn't to make your car go "P-TISH" either.... blablahblahblah stall surge blahblah, if standard cars run them even at low boost, blah blah blah
Your average buyer of a standard car dont like or understand strange noises.
Hears a chatter noise and will be straight back down the dealership asking what the fuck is that wierd noise and is my car broke.
"Noise supression devices" as many factory workshop manuals calls em.
They are useful/needed on some engines, but are far less useful in performance and reliablility reasons that some people think.
05-06-2006 | 07:34 PM
#50
Irritating c........
iTrader: (1)
Joined: May 2003
Posts: 21,265
Likes: 147
From: The Dark Side of the Moon...
Originally Posted by stonehavencossie
Clarksons take on dump valves last night for the prodrive thingy was amusing
SQUIRREL MUNCHERS
Cossies inparticular with a dump valve and chatter (like mine) sound
SQUIRREL MUNCHERS
Cossies inparticular with a dump valve and chatter (like mine) sound
Originally Posted by Stavros
Originally Posted by Thrush
Thats logic for you. Lets have a look at why the dumpvalve was invented shall we? And no, it wasn't to make your car go "P-TISH" either.... blablahblahblah stall surge blahblah, if standard cars run them even at low boost, blah blah blah
Your average buyer of a standard car dont like or understand strange noises.
Hears a chatter noise and will be straight back down the dealership asking what the fuck is that wierd noise and is my car broke.
"Noise supression devices" as many factory workshop manuals calls em.
They are useful/needed on some engines, but are far less useful in performance and reliablility reasons that some people think.
I wasn't mentioning anything about WHY manufacturers fitted them as standard.... I merely posted about Cossies having them as stadard to illustrate the point about what a dumpvalve does. Yes, had I thought of it at the time, mentioning that they SUPRESS audible noise would have also been good in my answer.....
05-06-2006 | 09:44 PM
#51
Too many posts.. I need a life!!
Joined: May 2005
Posts: 768
Likes: 0
From: Essex
Originally Posted by Thrush
Originally Posted by COSSIE CAL
well ok but e.g on a rs turbo or cossie:
big power norwiegan cossies do not have dump valves they have big,big wastegates=cossie's,rs turbos etc.dont really need them.and i dont like the noise of them
big power norwiegan cossies do not have dump valves they have big,big wastegates=cossie's,rs turbos etc.dont really need them.and i dont like the noise of them
The idea behind a dumpvalve is to release trapped air from the intake system - between the turbine housing and throttle butterfly - when the throttle is snapped shut (eg, lift off or gearchange). Think of it like this : you have pressuried air from the compressor housing being fed to the throttle butterfly to enter the engine. When you snap the throttle shut this charge air has nowhere to go. It crashes into the now shuit throttle butterfly and richochets backwards, towards the compresser of the turbo. This is it's only exit point - throught the compressor wheel and out via the air filter. The process caused by charge air travelling backwards through the compressor wheel is called "turbo stall". It can significantly slow the speed of the turbine, and in some cases (if there is enough air) stall it. Meaning two things : 1) when you get back on the gas again you have to speed the turbo up again and start compressing all over again - this is called LAG. 2) turbo stall can significantly lower the life of the common shaft and bearings inside the turbo - in extreme cases this is called FUCKED.
So, the dumpvalve opens when your throttle is closed (dumpvalve is kept closed when the throttle is open as it is under vacuum(sp)) and releases the trapped charge air so that it doesn't travel backwards through the turbo calling turbo stall, lag and lowering the lifespan of the componants.
Don't like the noise, or attribute "nah they're shit cos of the way they sound" ??? Then get a recirculating dumpvalve - the type that is fitted to MANY cars from STANDARD (including RS Cosworths
)Oh and whats the point about the big BHP cossies having big BIG wastegates? So what? All the wastegate is, is a part of the turbo that opens when the turbo has achieved the preset ammount of pressurisation (ie, if the turbo is set up to make 25psi, the wastegate opens at 25psi) to allow a flow-out of exhaust gas (from the exhaust side, not the compressor side) from the turbo to maintain a constant 25psi held, rather than to carry on building pressure. The wastegate does nothing like what a dumpvalve does, and it DOESN'T contribute to any chatter noises either.
Chatter noise is the sound of charge air being "chopped" by the compressor blades as it exits bacwards through the compressor and out the air filter when you don't have a dumpvalve
05-06-2006 | 09:48 PM
#52
Too many posts.. I need a life!!
Joined: May 2005
Posts: 768
Likes: 0
From: Essex
Originally Posted by plynchy
My Focus has a recirc one on (std) and with a K&N cone its loud as fuck! Not what I expected or wanted. 
06-06-2006 | 09:20 AM
#54
DEYTUKURJERBS
Joined: Apr 2004
Posts: 29,378
Likes: 1
From: North Korea
Originally Posted by Thrush
Originally Posted by stonehavencossie
Clarksons take on dump valves last night for the prodrive thingy was amusing
SQUIRREL MUNCHERS
Cossies inparticular with a dump valve and chatter (like mine) sound
SQUIRREL MUNCHERS
Cossies inparticular with a dump valve and chatter (like mine) sound
Originally Posted by Stavros
Originally Posted by Thrush
Thats logic for you. Lets have a look at why the dumpvalve was invented shall we? And no, it wasn't to make your car go "P-TISH" either.... blablahblahblah stall surge blahblah, if standard cars run them even at low boost, blah blah blah
Your average buyer of a standard car dont like or understand strange noises.
Hears a chatter noise and will be straight back down the dealership asking what the fuck is that wierd noise and is my car broke.
"Noise supression devices" as many factory workshop manuals calls em.
They are useful/needed on some engines, but are far less useful in performance and reliablility reasons that some people think.
I wasn't mentioning anything about WHY manufacturers fitted them as standard.... I merely posted about Cossies having them as stadard to illustrate the point about what a dumpvalve does. Yes, had I thought of it at the time, mentioning that they SUPRESS audible noise would have also been good in my answer.....
I replied as your post seems to make out they needed for some form of performance/reliability reason, and thats not the reason they are fitted to standard cars at all.
Otherwise idve not posted on this ghey thread.
06-06-2006 | 09:57 AM
#55
PassionFord Post Troll
Joined: Jul 2003
Posts: 3,058
Likes: 0
From: Wolverhampton
I can't believe dumping valves cause so much aggrevation, it's like Trinny and Suzanna have entered the car world.
Why don't people admit they either do or don't like the noise and all this justification is just invented to support their choice.
Yeah dump valves can come across as a bit chav but frankly when you are driving a Sierra or Escort turbo with a big exhaust hanging out the back it's not like chatter is going to make you look charming and sophisticated is it.
And as for turbo realibility I guess all those dumpvalve lovers out there spend their weekends carefully wiggling the compressor shaft and checking their oil supply lines for blockages. The fact is most people with a dumpvalve rattle on about how they are good for the turbo just before started the car up and screaming off down the road at full boost so, guess what, you can hear the dumpvalve.
When I first heard a dumpvalve I thought it sounded stupid and childish and it was at that point I knew I had to have one. When I finally got one I drove around with a mate laughing to ourselves like Beavis and Butthead with people staring at us like the utter nobs, and they were right too. I then proceeded to repeat the process with chatter on an old Volvo and again people stared and possibly thought "Is that the nob with the Sierra that sounds like a bus, why does his Volvo sound so stupid" But who cares.
Why don't people admit they either do or don't like the noise and all this justification is just invented to support their choice.
Yeah dump valves can come across as a bit chav but frankly when you are driving a Sierra or Escort turbo with a big exhaust hanging out the back it's not like chatter is going to make you look charming and sophisticated is it.
And as for turbo realibility I guess all those dumpvalve lovers out there spend their weekends carefully wiggling the compressor shaft and checking their oil supply lines for blockages. The fact is most people with a dumpvalve rattle on about how they are good for the turbo just before started the car up and screaming off down the road at full boost so, guess what, you can hear the dumpvalve.
When I first heard a dumpvalve I thought it sounded stupid and childish and it was at that point I knew I had to have one. When I finally got one I drove around with a mate laughing to ourselves like Beavis and Butthead with people staring at us like the utter nobs, and they were right too. I then proceeded to repeat the process with chatter on an old Volvo and again people stared and possibly thought "Is that the nob with the Sierra that sounds like a bus, why does his Volvo sound so stupid" But who cares.
06-06-2006 | 10:05 AM
#56
20K+ Super Poster.
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Joined: May 2003
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From: Essex... and Birmingham!
@ MWF I run 2 because the I have a Big Turbo and it needs them. Bothered about the noise and bothered about what people think as its a track car.
Its also a souped up FORD with silly spoilers on and so like it or not it IS chav. Dump valves or not!
06-06-2006 | 10:10 AM
#57
No1 Blower.
Joined: Jul 2004
Posts: 6,738
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From: Milton Keynes
I dont think it is a case of good or bad, thay are needed in majority of applications.
Manufacturers put them on the cars that leave the factory (inc the cosworth) for a very good reason, and its not for the noise factor...LOL
Manufacturers put them on the cars that leave the factory (inc the cosworth) for a very good reason, and its not for the noise factor...LOL
06-06-2006 | 10:19 AM
#58
PassionFord Post Troll
Joined: Jul 2003
Posts: 3,058
Likes: 0
From: Wolverhampton
Originally Posted by COMEDY DAN
Manufacturers put them on the cars that leave the factory (inc the cosworth) for a very good reason, and its not for the noise factor...LOL
06-06-2006 | 10:21 AM
#59
No1 Blower.
Joined: Jul 2004
Posts: 6,738
Likes: 0
From: Milton Keynes
Originally Posted by MWF
Originally Posted by COMEDY DAN
Manufacturers put them on the cars that leave the factory (inc the cosworth) for a very good reason, and its not for the noise factor...LOL
06-06-2006 | 10:24 AM
#60
PassionFord Post Troll
Joined: Jul 2003
Posts: 3,058
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From: Wolverhampton
Originally Posted by COMEDY DAN
Originally Posted by MWF
Originally Posted by COMEDY DAN
Manufacturers put them on the cars that leave the factory (inc the cosworth) for a very good reason, and its not for the noise factor...LOL
06-06-2006 | 10:27 AM
#61
No1 Blower.
Joined: Jul 2004
Posts: 6,738
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From: Milton Keynes
A manufacturer does not put a bosch recirc on for the noise factor.
It is there to recirculate the boost pressure when the throttle is closed, back into the air box to eliminate turbo stall.
Is that it?
It is there to recirculate the boost pressure when the throttle is closed, back into the air box to eliminate turbo stall.
Is that it?
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