dump valves

cm1179 · 3 Dec 2010 at 19:04

are these purely a novelty factor or do they give a true efficiency gain on the turbo?

the bloke i saw doing donuts in the snow in his punto gt in the tesco car park earlier seemed to enjoy the sound

stulid · 3 Dec 2010 at 19:05

+10BHP across the REV range!!!!!!

Born_2_Kill_83 · 3 Dec 2010 at 19:05

There for little boys whom grew out of the Saxo 1.1 VTS with 18's yesterday

Six6siX · 3 Dec 2010 at 20:54

Had one on my Supra.

Depends on the car.

Iceman · 3 Dec 2010 at 20:55

They are actually meant for a reason.

Mucky_Pup · 3 Dec 2010 at 21:11

Got one on my ST.

Meridian · 3 Dec 2010 at 21:22

Does any main car manufacturer fit VTAs as standard? All I know of use recircs or nothing.

M

Vulcan · 3 Dec 2010 at 21:23

I thought every turbo had one? They are there to prevent the compressed air going back up through the turbo when you release the throttle/change gear.

Matt82 · 3 Dec 2010 at 21:24

nearly every turbot engine has a dump valve.

some recirculate, others dont. if they dont theyre noisy.

simples

beermonster · 3 Dec 2010 at 21:47

Gets rid of flat fish spots.

Agent_Smith357 · 3 Dec 2010 at 22:09

The whole point of buying a turbo car is so you can have a dump valve.

Grad · 3 Dec 2010 at 22:13

Loowi_ashley said:
There for little boys whom grew out of the Saxo 1.1 VTS with 18's yesterday

Sorry, what?

beermonster · 3 Dec 2010 at 22:24

Grad said:
Sorry, what?

I've reread it ten times and it still hurts my head.

CraigN · 3 Dec 2010 at 22:26

Most are recirc which don't make the noise. They stop compressed air going back into the turbo when the throttle is closed and causing compressor stall. They keep the turbo spinning for better throttle response.

Joshy · 3 Dec 2010 at 22:31

It's worth noting that recircs can actually make a half decent noise when a cone is installed rather than a standard airbox :cool:

[FnG]magnolia · 3 Dec 2010 at 22:37

CraigN said:
Most are recirc which don't make the noise. They stop compressed air going back into the turbo when the throttle is closed and causing compressor stall. They keep the turbo spinning for better throttle response.

This is pretty much my take on it. Most DV's are there for efficiency rather than making the Brap Brap Whoosh! noise. I never really got the 'my car makes a noise when i shift' thing :confused:

[FnG]magnolia · 3 Dec 2010 at 22:38

Joshy said:
It's worth noting that recircs can actually make a half decent noise when a cone is installed rather than a standard airbox

Your manufacturer may vary

Memphis · 3 Dec 2010 at 22:42

Grad said:
Sorry, what?

Ignore Loowi. He's a bit... special.

probedb · 3 Dec 2010 at 22:59

Some info here.... http://www.grahamgoode.com/dump.htm

In a few words it prevents damage to the turbo, stops it stalling when the throttle is closed etc....

Rich1988 · 4 Dec 2010 at 00:26

Longbow said:
I thought every turbo had one? They are there to prevent the compressed air going back up through the turbo when you release the throttle/change gear.

a lot of people including myself run that set up, compressor stall doesnt really reduce the turbo life particularly my turbo is on 201,000 miles still pulling strong (will blow up now of course though)