Aftermarket recirculating valve - size?

[Bibby]

Is there a "size" specification to look out for when looking for an aftermarket valve? What else should be pertinent?

Have just ordered a boost gauge (at last) and now I'm looking for a new DV. Just fancy something a bit different.

[GandalfS6]

@Bibby - I guess the only important measurements are that the inlet and outlet of the TBV (DV can mean dump valve or diverter valve so I am starting to prefer Throttle Bypass Valve) has to be 25mm, if you have standard sized hoses.

I have used the Forge DVR (diaphram type) which responds very quickly but is not advisable in high boost applications. I have now bought a Forge FMDV006 (piston type), which is much larger than the DVR or the standard Bosch TBV and can handle high boost better. I have also used the Forge DV007P (also piston) which worked quite well on the car. I can't comment on the 006 yet as my new turbo is still on my workbench

I have also heard good things about the Hyperboost TBV (Milltek) , GFB's and Bailey DV30.

[Bibby]

Thanks Gandalf. The Milltek one was the one I was considering trying.

[Bibby]

Sweet, just ordered the Hyperboost HX. £110 all in from the TT Shop, of all places.

Will post an opinion when it's fitted.

[Bibby]

Came today, fitted it this lunchtime. What an effort! The jubilee clamps aren't in the most accessible of places are they.

Haven't gone for a test drive yet, just parked it up (I'm at work). The chirrupy noise on gear change has gone now though. Just make a sound like you'd expect to hear when air is venting, although like I say, haven't hammered it yet.

Will go for a spin after work to see what difference it's made.

[GandalfS6]

If the old TBV was fooked (very likely) you might even find that the car holds boost better as well!

BTW did you remove the headlight? It is the easiest way to get to the TBV.

[Bibby]

No, didn't remove the headlight. I just scratched my hands up instead.

Went for a spin after work. I don't think it's quieter than before, just different. You can really hear it doing its job. Just sounds like air being blasted through a pipe, if that makes any sense.

It does hold boost better than before too. Worth the effort.

[jameswkr]

Did you fit it the same way round as standard ?

[Bibby]

Yes.