XR-Wayne

WRX 2003

Do i really need a dumpvalve guys.
Will it protect and help the performace or is it only there for the noise?
I dont want it just for the noise.

This Might be crap and its only what i heard but i heard that the D/V messes the performace up?


Cheers

leonpoole

I wouldnt change it, there is no benefit in changing it unless you are running big bhp in which case the standard one can leak boost

XR-Wayne

cool.

Cheers

corradoboy

Yes, but you do know that you've already got one don't you The standard Subaru item is a recirculating model which doesn't produce a silly noise, and recirculates the air back to the turbo to help slow it, thus keeping the measured air in the intake to maintain the correct air/fuel ratio.

Do a search, there's dozens of threads per month on the subject.

redwrx

As a direct answer to the thread title, YES - you do need a dump valve. Bit 'which' one is up to you.

The standard one, as stated is a recirc type, and doesnt make the whoosh sound ....it is more than adequate for the job, and for all the technical reasons.

A 'vent to atmosphere' (vta) type, does give the whoosh sound.

There are several threads on here, and alot claim that the vta, can (potentially) cause some engine damage as a result of over fuelling.. ( say potentially, cos ive not experienced it) .and yes, vta's are supposed mess up the metering.

i have noticed that since returning my car to the standard one, my mpg on a full tank has slightly improved..


Personally, i think its down to choice - i dont think you could sell vta's if they knowingly knacker'd engines..........i think its driving like a **** to hear it all the time.

I like the whoosh sound, but ive taken my vta off, after 2 and a half years, to get a bit of economy... but its only a 5 minute job to refit it.


Hope this helps


Frank (my93wrx)