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View Full Version : YES a Dump valve question.


Kenobi
21-04-2009, 10:12
hey all,

Just a quicky, Is it possible for a re-circ dump valve to lose you boost pressure?


Thanks
Tiny Tim
21-04-2009, 10:28
Not unless its leaking/has a stuck piston.
Kenobi
21-04-2009, 10:58
Not unless its leaking/has a stuck piston.

It shouldnt be. On the gauge it seems 2psi less with it in place.

How does a recirc one work. In words i can understand lol
Shane P
21-04-2009, 11:03
It shouldnt be. On the gauge it seems 2psi less with it in place.

How does a recirc one work. In words i can understand lol

The clue is in the name :)
Tiny Tim
21-04-2009, 11:18
It shouldnt be. On the gauge it seems 2psi less with it in place.

As opposed to what, running without?

Rather than dumping the air to atmosphere, it returns the dumped charge air to the air inlet line between the air filter and the turbo compressor housing to aid spool-up/keep the turbine spinning.
Kenobi
21-04-2009, 11:54
As opposed to what, running without?

Rather than dumping the air to atmosphere, it returns the dumped charge air to the air inlet line between the air filter and the turbo compressor housing to aid spool-up/keep the turbine spinning.


yeah thats what i though.

the standard recirc doesnt lose 2psi. its made of plastic.
Tiny Tim
21-04-2009, 12:37
The usual black plastic Bosch no doubt then. Stick the OE re-circ back on then?
Spooky
21-04-2009, 12:39
I've forgotten how awesome dump valves are, my car is wearing one now and I've been chuffing all morning :laugh:
Adey aka Ewok
21-04-2009, 14:38
so gay so so gay, let down spooky
Penfold aka The Dealer
21-04-2009, 17:12
I've forgotten how awesome dump valves are, my car is wearing one now and I've been chuffing all morning :laugh:

:agree::laugh: I remember taking Ricardo out in my grey 5 after he fixed at got it running...

when the dump valve went you should have seen his face duck down in shame... a quality moment i shall not forget. :laugh:
jesus in the seat of a 5
21-04-2009, 17:46
:agree::laugh: I remember taking Ricardo out in my grey 5 after he fixed at got it running...

when the dump valve went you should have seen his face duck down in shame... a quality moment i shall not forget. :laugh:

you still got that one on the cup....;)...:laugh:
sphinX
21-04-2009, 18:27
theyre fun when u first put them on, driving around going woooshhh all day haha
Penfold aka The Dealer
21-04-2009, 19:00
you still got that one on the cup....;)...:laugh:

I most certainly have, although i have an uncut boost hose to go on after soon enough. :)
jure
21-04-2009, 20:07
It depends what rate spring you have. If you have black Bosch one or Forge ally replica they should cope bit over 20psi if in good working order.
Kenobi
21-04-2009, 20:18
It depends what rate spring you have. If you have black Bosch one or Forge ally replica they should cope bit over 20psi if in good working order.


Hmm, this is adjustable?

What would be the point of an adjustable recirc D/V.

On mine all i know is that if it isnt around 0.8 0.9 bar my car goes into limp mode.
jure
21-04-2009, 20:49
Same one as "normal" adjustable dump valve. You adjust piston tension on which pressure you want valve to start dump the air.
markey b
22-04-2009, 01:05
on the forge i think i put a green spring in and stretched it a bit, was nice because it only 'dumped' with proper boost not pissy half throttle because it got annoying going off every 30seconds
jure
22-04-2009, 07:08
Same thing here but mine was doing that with green spring inside. Bought it as "group A" BBPT DV. I took it off anyways :)