car is a 53wrx with sti engine recently fitted running 1.4bar,340bhp/330t.dump valve was fine 4 app 1 month on new engine and app 2 years on wrx with no probs,so 2day valve sounded 2 b opening 4 longer,so had a look and valve appears as suspected 2 be not closing fast enough,any1 had this or similar issue,any advise/suggestions welcome.thanks alot guys.

 

Contact Forge mate. They are very good with after service and have been known to supply service parts foc

 

on 2 it,never thot of that,c wat happens,thanks alot mate.

 

the spring has weakened.

contacting forge is one option.

Other is get the uprated spring kits for about £18 and fit a replacement spring

 

I,d recommend reverting back to the standard Subaru recirculating valve. More reliable and probally more efficient. Steve.

 

looked at spring kit,seems like a good option,r you on about the 4 spring/fine tuning kit mate and have you went down that road then?

 

most likely the forge one is a diaphragm dump valve and therefore overtime the spring will weaken and not close quick enough, you could buy a stronger spring kit as others have suggested, but you could also just buy another dump valve, such as blitz and baileys which has double pistons closing it instead of a diaphragm and is stronger.

 

ive got a forge one and the spring snapped in it last year. the hiss was longer and slower... cost me £8 for new spring from local car shop.... lowkost motor spares

 

I have forge on mine, and have put in stronger spring. Doesn't go off hardly at all. Which gives you chatter.
The only reason i fitted forge as it fitted to my intercooler after changing to an STi8 on a classic, and no room for recirc

 

Being as your car is pulling 1.4 bar the std spring will struggle with that after a while,and as you can't adjust the forge dv,it will eventually weaken.It does contain 2 Springs which counterbalance each other so either 1 might be knackered ,would not suggest a baileys as they have twin pistons and are quite prone to failure. The blitz has a rubber diaphragm and a single piston and is good up to 1.2 Bar,but can be adjusted up to 1.5 bar before needing to uprate the spring.if you can live without the noise,then as suggested above fit a std recirc valve,they rarely fail,and good for 350+ bhp and more importantly cause no running issues imho .

 

Sorry to hijack,

If I was to change the spring strength in my Forge DV would I need to get the map looked at?

 

Ideally yes, as Mrchips said,

Quote:

Originally Posted by Mrchips

I have forge on mine, and have put in stronger spring. Doesn't go off hardly at all. Which gives you chatter.

And there for means you run leaner for longer due to the DV not dumping as often, by how much or little, i have no idea

 

I had a forge one on my last car and they have a rubber membrain in them, like a gasket basically, and mine got split due to running more presure which resulted in the same thing as you are explaining. however springs for them are only around £10 and i belive they will supply you with a new membrain

dan

 

thaks alot guys,ordered service kit and yellow uprated spring.will map defo need checked????????? as its only a slightly stronger spring.

 

BTTT.

Be good if a mapper could answer. I too would like to change spring strength but dont wanna mess my map up.