Recirculating valve

**Turbodave** · Tuesday 3rd February 2009, 21:11

Superb lad, doesn't look impossible. Assume I can just trace round the valve body onto a piece of plate (3mm ish) and then cut it out and drill the required holes, make a gasket and then seal it up with a smear of instant gasket? Or is it easier to phone Forge?

**cameron** · Tuesday 3rd February 2009, 21:15

Depends how easy you find it is too make a plate,

You dont need to make a gasket though

just a smear of instant stuff is as good

Lee

**zoomungus** · Tuesday 3rd February 2009, 21:23

Originally Posted by cameron

Recirc on the Turbo

Recirc off the Turbo

Blanking plate in Place

Just move the air filter hose out the way and get in there with a Ratchet Spanner ( 10mm iirc )

The bottom nut is easier to get from underneath the car

Lee

ill put it on the lift on sunday morning and take some piccy's underneath the car, hopefully the plate will be here.

thanks for the pics

**Turbodave** · Tuesday 3rd February 2009, 21:28

http://www.forgemotorsport.co.uk/con...roduct=FMBPMIS

Forge blanking plate... looks bling, question is do you pay £24.44 or spend a half hour so so mucking about with plating and a Dewalt drill.

**zoomungus** · Tuesday 3rd February 2009, 21:32

Originally Posted by Turbodave

http://www.forgemotorsport.co.uk/con...roduct=FMBPMIS

Forge blanking plate... looks bling, question is do you pay £24.44 or spend a half hour so so mucking about with plating and a Dewalt drill.

half an hour? for me maybe an hour!

**Enigma666** · Tuesday 3rd February 2009, 21:52

Buy one, at least the are proven....if you got a leak it would be a right faff sorting it out potentially

**t5 pete** · Wednesday 4th February 2009, 07:55

Originally Posted by Enigma666

Buy one, at least the are proven....if you got a leak it would be a right faff sorting it out potentially

As enigma has said for $20 odd quid you will be 100% sure there will be no leaks i was think about making a plate but realised it wasnt worth messing about making one

**Alan M** · Wednesday 4th February 2009, 08:15

I have made one and used a Forge item. The forge item does seal better but a homemade one from 3mm stainless plate works well enough if used with some 1mm rubber gasket as the sealing joint. You may need to get some slightly longer bolts as the recirc is made from thin pressed steel. The forge plate can utilise the original bolts though. For the money and for less of a worry on the boost leak front I would fit a forge plate.

**Saaamon** · Thursday 5th February 2009, 21:24

Does blanking the recirc valve cause the turbo to take longer to spool back up through gear-changes?

**Loadsamiles** · Friday 6th February 2009, 01:49

A re-circ valve is far more effective than a dump valve in many applications.

More correctly called a CBV (Compressor bypass valve), the CBV simply reduces the pressure difference either side of the compressor wheel without seriously reducing the pressure stored in the charge air system. Thus when you come back on throttle after the gear change you still have a reasonable charge of air in the system ready to feed to the engine.

Going from a CBV to a DV is a step backwards.

Duane will not be noticing the lack of power through lack of DV or CBV as although his compressor will almost be stalling he will still have a fully presurised charge air system all ready to go after the gear change. This will compenste to some extent for the turbo having to spool up again.

**BruceT** · Friday 6th February 2009, 08:17

Don @ Kalmar does New CBVS for about £80 too. Even with a tenner delivery thats cheaper than most, if not all Atmospheric dump valves.

**PNuT** · Friday 6th February 2009, 14:56

Originally Posted by Loadsamiles

More correctly called a CBV (Compressor bypass valve), the CBV simply reduces the pressure difference either side of the compressor wheel without seriously reducing the pressure stored in the charge air system. Thus when you come back on throttle after the gear change you still have a reasonable charge of air in the system ready to feed to the engine.

im not convinced......