Diverter Valve

[WRXconvert]

i want a louder diverter valve.... not obnoxiously loud, just noticable. i see that the forge 007 is probably the best bet. is it as easy as taking the old one off and putting the new one on? and is there a difference in sound? also i have read that if you do replace your diverter, you should reverse it... any ideas on why this is the case? thanks guys

[h100vw]

The forge barely makes any noise IMO and as for reversing, they don't fit as well and I can't see any benefit from doing this anyway. It might make a difference with the std diaphragm valves but with a piston I doubt it.

Gavin

[TassieGTi]

As h100vw said, noise is minimal because the 007 is a recirculating valve (dumps charged air back into intake). Fitting is a simple swap for the original BOSH valve. You can fit the new valve either way, but for quieter operation, it is recommended that you install it the same way around as the original. The dump noise you are after will come more from an atmospheric valve.

I fitted a Forge single-piston atmospheric valve (001GTI) on my Mk1 project, but obviously not a factory set-up. It is different from the recirculating valve, as it dumps the charged air into the atmosphere at throttle lift and you get a dump noise. I would not say that it is ‘obnoxiously load’, but a noticeable ‘whoosh’ sound on throttle lift.

Check out the Forge website for suitable applications

www.forgemotorsport.com

[h100vw]

I forgot to mention, if your car is chipped the extra boost to dump makes a bit of difference to the noise but people won't be turning their heads to look when you drive past.

Atmospheric valves have a reputation for throwing check lights personally I wouldn't bother going down that road.

Gavin

[shaneth]

Forge The Splitter, a Recirculation and Blow Off Valve

Wouldnt this be the one your after or is the one your talking about.

[h100vw]

Please Note: This valve requires installing the opposite way to the original Bosch Valve. i.e. the side pipe is fitted into the Turbo Intake Hose and the base pipe connects to the hose that runs to the boost side of the turbo.

I reckon this is where the constant reference to fitting the DV backwards comes from.

I read the fitting instructions for the TT where it states that fitting the same way as the std valve give a quieter operation..

Having fitted them backwards myself as a trial, I found that they don't fit as nicely.

That hybrid valve is pricey when you consider the exchange rate and shipping, 125 quid is over $300 and then you have to have it shipped too.

I have some alloy ones that look just like a Forge (not that you could make one look very different if you tried) for a lot less than $200.

Gavin

[shaneth]

What brand are your alloy ones??????

[WRXconvert]

ok, so it is possible to put a split valve on.. i was looking at the turbosmart kompact series.. $325 or so for one of those is a bit pricey. gavin the alloy ones you talk about, how much are they and where are they manufactured.. and they are a split?

[Kai]

If anyone does this post details about it in here.

[Spec83]

I have checked out the Turbosmart kompact series dual stage BOV (the one with return and trumpet) and it will fit... You can only install a BOV one way.. usually the bov is hard plumbed into the boost side of the intake piping whereas on our cars there is a hose extension so the BOV can be placed back into the atmospheric side of the turbo due to the placement of the turbo etc etc...

On MAF cars you get a lot of backfiring and cutting out if you install an atmo BOV... the EMS thinks it has heaps of air pumping through it when really this is just going to atmosphere causing the EMS to add fuel for air that isn't there causing stalling and backfiring... with a plumbback valve this portion of air is infinatly cycled through the intake piping meaning no more air can enter untill the throttle body is opened again... Next time you are near a skyline et al listen to a bakcfire on gearchange - this is the effect of atmo BOV on MAF sensored cars... MAP don't suffer this problem as they meter their air at or after the throttle body...

Really.... $325 is a bit excessive for a wankey noise anyway... The stock BOSCH valve is more than capable..