I S V valve

[sparks 0]

hi people

i was hoping someone will shed some light on this

 

ive heard of one way isv valves on the internet but according to the g60 vag tech video which is posted on you tube the isv bleeds boost when it gets over 15psi as a saftey measure so why woould you have a one way valve ????

 

cheers stu ...

[boost monkey 0]

the simple answer is:

 

G60 ISVs are different from other ISVs :salute:

[sparks 0]

so would it better to fit a one way valve or not

[boost monkey 0]

one way valves for 16v and VR6 engines (naturally aspirated) and boostbleed valves for G60 engines.

 

Not actually sure which engine you have I'm afraid.

[dirtytorque 0]

The isv's on some vw n/a cars are the same as the one fitted to the g60.

I took one of a 2.0 8v car and it had the same part code as the one on my g60.

The isv is activated by the ecu to either let in air or bleed boost.

This is controlled by the ecu.Both actions are performed in the same manner by the ecu pwm'ing the valve to open it.

There is no difference in terms of how the isv is activated in the two different scenarios.

[ProdigalSon 1]

The isv's on some vw n/a cars are the same as the one fitted to the g60.

I took one of a 2.0 8v car and it had the same part code as the one on my g60.

The isv is activated by the ecu to either let in air or bleed boost.

This is controlled by the ecu.Both actions are performed in the same manner by the ecu pwm'ing the valve to open it.

There is no difference in terms of how the isv is activated in the two different scenarios.

That's my understanding too - the ECU opens the valve, and any pressure differential across it causes air to flow in either direction. Hence it does double duty as idle stabiliser (air from recirculation hose pulled into inlet manifold due to relative vacuum there at idle) and as boost regulator (air pushed into recirc hose from inlet manifold as higher pressure there) on G60 engines. :salute: