john_d

is there a site that sell's them and lets you hear what sound they make?

i can find loads of sites that sell them but none let you hear the noise they make.

boothy

iTrader: (14)

Il tell you what they sound like "A BUS" a gay one at that Dont do it

milesy23rst

iTrader: (16)

As above m8 dont do it as it makes your car sound GAY

john_d

how does it sound gay?

isnt it almost a an essential item when fitting a turbo?

milesy23rst

iTrader: (16)

coz as boothy has said it makes it sound like a bus!! and no you dont need a dump valve unless you are running high boost

Karlos G

iTrader: (4)

It's a long on going debate as to whether it prolongs the life of your turbo or not when running high boost, same goes for "Does it make the turbo spool faster after gear change" debate......
Really it's just up to you if you like the sound or not IMO..
I run 27psi of boost (peek) and dont use one, the chatter is awsome!

Check my vid here and listen!
http://www.youtube.com/watch?v=nmZNeThwFLE

rst cabbie

go efi chatter is best

john_d

so how do you get the chatter?

cozmeister

iTrader: (1)

In my experience, there is more lag without one...but I totally agree - it is a personal choice. Do what puts a bigger smile on your face.


Remove the dump valve and plug the pipes that are left behind.

john_d

i havent got a DV yet though

m4tt274

iTrader: (2)

pisses me off when people say dv are gay. they serve a machanical purpose. most people on the street like DVs and turbo chatter as well as being bad for your engine sounds broken

Karlos G

iTrader: (4)

IME there is absolutely no difference! lol
I have taken mine off and logged the boost vs rpm curve, and then done exactly the same run again without it and the boost neither came in earlier or later after a gear change.


It is 100% not bad for your engine!
Some think that it might add wear on your turbo bearings but there has never been any actual hard proof of this.
A lot of people on the 'street' prefer chatter instead of sounding like a bus too lol

I quite like both TBH but right now I dont have mine fitted..... each to their own

john_d

well i like some of the sounds, hence why i want a site that can let you hear what they sound like.

m4tt274

iTrader: (2)

the sound will more depend on what PSI you are running.
from experience they all sound pretty similar tho

boothy

iTrader: (14)

Just stand next to local bus station

Karlos G

iTrader: (4)

Yeah I think they all sound pretty much the same too.
lol

crazycage

so come on then who would'nt fit a dump valve if the have just spent Ł1200 on a gt turbo ???

boothy

iTrader: (14)

Yes i would if i had bought someting that dear

crazycage

i run one on my zetec , but for years i never one on both my stg3 t3 and my t34 ,i also never ran the water pipes on both them turbo's!! but i run them on my gt and a dump valve .

milesy23rst

iTrader: (16)

dump valves are gay gay gay gay gay!!! Lmao

Karlos G

iTrader: (4)

I wouldnt!
I also dont run the water cooling on my T3.

crazycage

you must have more spare cash than me then!
anything i can do to keep my roller bearing turbo in good shape i will.
plus you run a BIG risk of melting the plastic cage the bearing is held in place by if you dont run the water pipes.

each to there own tho.

Karlos G

iTrader: (4)

lol if only I had the money for a GT turbo!!
Handy to know about the plastic casing, I cant believe they use that in a turbo?!
GT water cooling FTW! lol

john_d

so its ok if i have a good dear-un but not a 2nd hand cheap-assed turbo?

nice.

orionmojo

iTrader: (1)

Thats not the point. a bigger turbo is going to be working much harder anyway with a bigger spec engine. a stock T3 is meant to last thousands and thousands of miles anyway on a stock engine without a dump valve

thats what was meant.

And, i ran one on mine for a while. they sound cool when your going full chat down a bypass but i've a quickshift on mine andway so only ever got the ps. lol not the full pshttt. around town and driving normally they sound utter shite. little "psh" sounds that get loads of chavs looking round and attracting the wrong attention when your just trying to get to work or the shops for example.

cozmeister

iTrader: (1)

If someone knows a way to have them 'switchable' that'd be great. WOuld save me getting dirty every time I change my mind.

mentalasanything

Well, the way to do that would be to put a one way valve in the vacuum line just before the dump valve. It's a common mod to "Block off" the OEM dump valve on Z20LET Vauxhall engines.They tend to use wiper jet one way valves from Halfrauds.

Quicker than removing the valve itself!

Lee

ShiftyOldScoob

iTrader: (3)

I run a collins item on mine at 2.2 bar and it sounds very scimilar to my mate who doesent run one.

I like the sound mine makes but hated the old one as it did sound like a bus!

I do however think that my mates car sounds better with the chatter!...Having driven both cars though I can say theres little if any difference in spool times

m4tt274

iTrader: (2)

it doesnt alter the spool times it just reduces the 'lag' when u put your foot back on the throttle. the DV lets all the compressed air out so it cant stall the turbo. allowing turbo chatter allows the air to stall the the compressor wheel meaning it has to spin back up again.

Karlos G

iTrader: (4)

The turbo does not stall!! If that happened you'd have no exhaust gasses flowing out and the engine would stall! ....
Also you have to remember that when you dump your loosing all the charge air/pressure from your intake which the turbo then has to repressurise again... adding lag

So whats better??... Retain charge air/pressure or reduce spool up time? Both will slow down the time it takes to reach the desired boost pressure again after a gear change...

Hence the ongoing debate...

cozmeister

iTrader: (1)

No. The vacuum from the inlet stroke pulls air into the inlet manifold keeping the engine running. Also, you need something pretty hefty to stall an engine due to flywheel inertia.

And the phenomenon known as 'chatter' is correctly referred to as compressor or turbine stall, because the compressor wheel is forced to stall due to the turbulent air in front of the throttle plate going back the way it came because it has nowhere else to go.

Correct

No. The very nature of a turbocharger dictates that lag will always be present without something to combat it.

By stalling the compressor wheel, the turbine wheel is also stalled - it doesn't stop completely, it reverses direction many times (which causes the chattering sound) due to turbulence on the compressor side and exhaust gas flow on the turbine side, until it can continue spinning in the right direction again.

By stalling the turbine, you're effectively making more work for yourself - if the compressed air can escape, the turbine won't stall, and therefore continues spinning in the right direction.


Debate is healthy

crazycage

it does slow the compressor down mate and with big boost it can stall the turbo.

the chatter you hear is the air charge getting chopped up by the comp wheel .

Cobs1808

MINE SOUNDS THE NUTS, but 1 mans rubbish is another mans tresure!!!! if you use the car every day then might get on ur I agree with the comment (DO WHAT MAKES U SMILE)
I have a bailey 1 on my s2 RST & its sounds good plus if I really boot it I get abit of chatter aswell

dearing5

after searching on here people have had print outs prooving there is very slight difference or none at all on lag etc

Karlos G

iTrader: (4)

Ok maybe I exaggerated a bit when I said stall the engine lol
But it would really build up back pressure in the head stifling the engine and restricting the flow of fresh gasses in.
I have never heard of the turbo reversing direction several times, is there any actual proof of this? If so all well and good, I didint realise.... but IMO it seems unlikely
There will always be lag of course but the amount can be increased or decreased.

TIL13R

Whats the Pros / Cons to not running water cooling...?

Karlos G

iTrader: (4)

Pro's... Lower coolant temps
Con's... Higher turbo housing temps (maybe oil)

With this setup my water and oil temps are both good, 27psi of boost I see a maximum of 105c water and 100c oil, this was on the hotest day we had of 30 odd degrees, normally they are both quite a bit lower than that.

Chopshop85

iTrader: (4)

as for the sound of DV's. They all make pretty much the same noise.
HKS SSQV's have changable fronts to alter sounds (higher and lower pitch). However, I dont even know if you can get them on a ford.

bubs_rsturbo

iTrader: (1)

+1 i also have a bailey dump valve on my s2 sounds the dogs balls not like a bus at all!!

john_d

sound clip?