lloydsound

Can anyone please explain exactly what a dump valve is for? Is it actually any use at all?

rb5 stu

First one of the new year.

Blue by You

iTrader: (23)

I was getting worried we weren't going to get one

The Trooper 1815

iTrader: (31)

Puuuut sssssssssh!

lloydsound

lol have I opened up a can of worms? I will happily delete the post

lloydsound

Wrx vs sti?

Zuber

You will get all the nice ladies with a dump valve,, they love the Wooooosh!

dexster81

iTrader: (1)

Jumping to conclusions here everyone. Are you on about dump to atmosphere or recirculation. Your best bet is to google it. All turbo cars come with them but because you said dump valve every here will think your asking about atmospheric and this is why you get stupid answers

lloydsound

Ok I meant the atmospheric (noisy) ones as I was unaware of there being other types? Is there an advantage to having one which sounds like this?

Zuber

None whatsoever, they just make a noise and they can cause running problems. Your best sticking to the oe one or if you must have bling, get a recirculating one.

lloydsound

Many thanks

dexster81

iTrader: (1)

As above if your car is standard then you already have one its a recirculation type. Which is the best type especially on a standard car. I however have a very modified car with a front mount intercooler and I like the chavy sound of the atmospheric dump valve so I have a forge one. No benefit to be honest would be better on a recirculation type but I'm running mafless and I wanted a smoother inlet pipe so I decided on a pssst type lol. I'll be a hated man very soon

MATT93

Blank it off completely. You'll get a nice noise that way lol..
Have been looking at doing the dump valve delete but I could pretty much guarantee my turbo would **** itself after a couple hundred miles - would be just my luck lol

RS_Matt

What is the crack with the dump valve set up on a Turbo-diesel, it's something I've not looked into aside from seeing a few posts down the years saying VTA's have to be electronically controlled?

Blue by You

iTrader: (23)

Says you after the original post wording has been changed

dexster81

iTrader: (1)

Yeah I edited my post as my spelling was terrible

Blue by You

iTrader: (23)

Not your post, the OP's first post (or are you LLoundsound in disguise?)

dexster81

iTrader: (1)

Then why tag my post??

Blue by You

iTrader: (23)

Because you made a criticism of previous posts based on a comment by the OP that you most likely didn't see because it had been edited before your first post.
Clear now?

lloydsound

I only edited the post because I posted an honest question and got three sarcastic remarks which were totally unhelpful, so I figured simplifying the original question may encourage more mature answers

Blue by You

iTrader: (23)

Spoilsport!
Questions like this arise time after endless time, so the answer is here somewhere. All you have to do is use the search function and you'll find what you need to know.
Whatever else you hear or read, there is a valid use for both types of DV, plus the 'hybrid' dual action types.
If it's just for the noise then a VTA will pump up your chest unquestionably.
A recirc DV will be of more benefit performance wise for normal street applications.
However when you start running more serious boost levels of around 1.8 bar and above, the OEM valves have a tendancy to leak so some people, like myself, will opt for a dual action DV which operated as a recirc for the most part, but when the going gets tough has a secondary VTA port.

If you are tempted to blank off your DV and go for the flutter sound as is mentioned above, you first need to assure yourself that your turbo is fit to handle the back pressure resulting from closing the throttle at full boost and not having a DV to divert it. Failure to check could result in fairly expensive repairs being required to your turbo or even the engine if it fails big time.

How's that?

RS_Matt

So when running a MAF does a VTA DV help prevent lift off det?

bludgod

iTrader: (3)

it's more likely to cause it as your fuelling goes out the window due to missing air. If you have lift off det get your mapper to fix it for you properly.

Filski

Found this quite helpful have a look
https://www.scoobynet.com/general-te...-question.html

RS_Matt

TBH I know little about lift-off det. Only that someone once mentioned a VTA DV can help prevent it.

It did get me curious at the time if a little bit of injected petrol is beneficial between shifts when running temps are high. (Due to the cooling properties of fuel)

scoobyboy1

iTrader: (16)

Did this to my brothers STi and it drove like a bag of ****, when you come off boost it felt like you was hitting a brick wall, just did not drive smooth at all, sounds good but it really needs mapping and go MAF-LESS.

lordharding

iTrader: (1)

Congratulations on raising this question

Don't think it's ever been discussed in scoobynet before

Under 100 posts
That good for your training


Get one
They are cool
Really impress the overweight teenage birds in McDonald's car parks who dream of a man with a dump valve which can lead to great riches and council house and 50" tv from bright house to keep the kids happy

Other chavs will think its cool

You need to go with the dump valve
Tracksuit bottoms with white socks that cover the bottoms
Trainers oversized
Gold chain from argus and maybe a couple of sovereign rings too
Mum /dad /funny tribals tattoos ( from magaluf special prices when drunk )
Halfords regular customer discount card
Lots of stick on tat
Stickers ( bubbling and not straight)
Stick on roof vent ( PM fat thomas for good prices and fitting instructions )

They are really good and will help for long term scooby ownership
( engine will go pop so the few classics left will be worth more )

Think that's it untill page 4/5

Blue by You

iTrader: (23)

Do I detect a slight note of sarcasm?

Sarg400

iTrader: (1)

Quality

lloydsound

Some very constructive posts, SOME