Little help to put my mind at ease please - DV replacement

[KRL]

And don't forget - the diaphragm versions can react much faster than the piston versions. 
 .

Do you mean the C DV will react quicker the the D DV?

Why is that?  I can understand why the OEM DVs react more quickly than the Forge DV but why would there be a difference between OEM DVs?

[tony_danza]

I think he means vacuum piston ones, the VAG piston one is electronic and thus reacts as fast as the diaphragm.

[KRL]

I think he means vacuum piston ones, the VAG piston one is electronic and thus reacts as fast as the diaphragm.

Yep thats what I understand hence the question 

[Teutonic_Tamer]

And don't forget - the diaphragm versions can react much faster than the piston versions. 
 .

Do you mean the C DV will react quicker the the D DV?

Marginally - yes.

Why is that?  I can understand why the OEM DVs react more quickly than the Forge DV but why would there be a difference between OEM DVs?

Pistons have more friction to deal with when sliding up and down their 'bore'.  Diaphragms have no such friction to deal with.

[Teutonic_Tamer]

I think he means vacuum piston ones, the VAG piston one is electronic and thus reacts as fast as the diaphragm.

Not quite - all the VAG ones (diagphragm and piston), as well as aftermarket ones such as Forge are all 2-way electronically controlled.  There is no vacuum actuation on any 2.0 TFSI valve.

But I'm probably being a tad pedantic - I doubt anyone could actually tell the difference between the two OEM versions (providing they were both functioning A1).  

EDIT: for cr@p spelling

[KRL]

While the forge valve does maintain the electronic solenoid it does also require vacuum from the throttle plate for recirculating boost.  So it uses a mix of both 

[Teutonic_Tamer]

While the forge valve does maintain the electronic solenoid it does also require vacuum from the throttle plate for recirculating boost.  So it uses a mix of both 

Yes - all the valves - Forge and OEM use a vaccum for sensing purposes - the valves are still actuated electronically.

[KRL]

Yes - all the valves - Forge and OEM use a vaccum for sensing purposes - the valves are still actuated electronically.

I'm pretty sure the Forge valve is not able to actuate electronically and it requires vacuum.  We discussed this here a little while while ago:
http://www.mk5golfgti.co.uk/forum/index.php/topic,13508.0.html

There was a thread on vortex which lead me into understanding the forge valve is not electronically actuated here:
http://forums.vwvortex.com/zerothread?id=3336171

Vortex seems to be down at the moment so have a look at it later if you can.  I will be interested to hear your input.

[Teutonic_Tamer]

Yes - all the valves - Forge and OEM use a vaccum for sensing purposes - the valves are still actuated electronically.

I'm pretty sure the Forge valve is not able to actuate electronically and it requires vacuum.  We discussed this here a little while while ago:
http://www.mk5golfgti.co.uk/forum/index.php/topic,13508.0.html

There was a thread on vortex which lead me into understanding the forge valve is not electronically actuated here:
http://forums.vwvortex.com/zerothread?id=3336171

Vortex seems to be down at the moment so have a look at it later if you can.  I will be interested to hear your input.

Firstly - don't believe everything on Vortex . . .

Back to the Forge - I've looked at their website - http://www.forgemotorsport.co.uk/content.asp?inc=product&cat=260306&product=FMFSITVR - and yes, it does say theirs is vacuum actuated.  However, something doesn't quite ring true.  I am lead to believe that the OEM valves rely on 2-way ECU control (for both 'sensing' and 'actuation') - however, this appears not to be the case (as is evident from the OP with the knackerd DV).  But you can't have an OEM valve being electronically operated, and an afterarket one being mechanically operated - and not have either a CEL or a DTC stored.

Jury still out . . .

EDIT: for cr@p spelling

[Teutonic_Tamer]

Moderators/Admins - can this thread be moved to the Technical Workshop section - http://www.mk5golfgti.co.uk/forum/index.php/board,35.0.html ??