6 pot

Dump Valves.

Dark Blue Mark

Doa search - you will find the answer is NO. We all contributed to a big thread only a few days ago.

MB

Jay m A

iTrader: (2)

You already have one, so why fit another?

Dark Blue Mark

Also, its 2 seperate questions.

Many fit them even though there is no benefit, but they want the noise (fair enough)

MB

Dark Blue Mark

Good point Jay

MB

Pavlo

MB,

There is a benefit in some circumstances, otherwise Subaru and every other manufacturer of turbo cars wouldn't fit them as standard. Just the standard ones don't make a stupid noise.

I have run a car without one, and it improves lag on gear changes (yes it does, please don't argue), but that's not the whole story. When you start to look at larger turbos, there are a number of problems to over come, that can be sorted with by the use of an appropriate dump valve. For VERY large turbos running HIGH boost (ie well over 2 bar) you have the problem of pressure spikes when you back off the throttle. If you are using a MAF sensor with a large turbo (ie Td05-20g and above) the flow reversions on back off totally screw around with the MAF sensor, and that causes jerkiness, and generally makes it unpleasant to drive "normally".

Good aftermarket Re-circ valves will often give less lag between changes than an OE valve, simply because they are setup to open less easily, and make the system closer to having no valve at all.

Paul

Graz

All production scoobs come with a dump valve as standard.

Think your poll is on about aftermarket ones

Uprated re-circ if your running high boost, yeah why not.

VTA - no thanks. Only if I was running a non airflow driven ECU, but even then not really my cup of tea.

Dark Blue Mark

Pavlo, I know the issues in detail and was assuming the thread meant VTA's -given it said "would you fit one"

http://bbs.scoobynet.co.uk/showthread.php?t=401902

MB

6 pot

Holy Hog Sh*t didn't realise this was such an in depth subject, just been reading through some of the old posts, made my mind up to stay with the original DV as fitted by Subaru.

And anyway being 40 means that I am far to old for the WHOOOOOOOOOOOSH

Thanks

6pot

Dark Blue Mark

MB

Elmer Fudpucker

....a bigger turbo earlier today



with said, appropriate dump valve

Brun

Is it too early for a beer????????????
Bugger it - who's round is it first?

kingofturds

iTrader: (1)

i need a few beers havent drunk since this morning

ALi-B

iTrader: (1)

If you like your car to sound like an asthma inhaler...then feel free

ALi-B

iTrader: (1)

Forgive my know-it-all-ness but that distinctly looks like an external wastegate

6 pot

This is most definately a case of "mines bigger than yours"

Aztec Performance Ltd

iTrader: (234)

not again!!!!!!!!!!!!!!!!!!!!!!!!!!!!