scoobie_eccosse

hey just come back from subaru and i asked there advice on changin my standard dump valve to a after market dump valve? they told me that an after market dump valve is worthless but just sounds good? they also sayed that a scoobie wi a after market dump valve makes the car loose power as the air is not recirculated back into the engine is this true cos i was just about to buy a new dump valve but whats the point if thats true can some one plz help thanxs

nik52wrx

As far as i know, performance wise they make jack s**t difference in terms of a gain, not sure about a loss, all they do is make a stupid noise.
Whats wrong with the one on the car or are you simply after the noise ?

Crosstalk

I thought you had a "wrx jap import (wagon) wi a nice tommy kiara body kit on it and a ninja ss system wi mushroom filter and bailey dump valve" - have you put a standard one in, or are not we talking about the same car?

scoobie_eccosse

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yea its still the same car but i just found out it has still got a standard dump valve but has everything else my fault for not checkin the car properly but is it worth puttin one on? and if ur the guy i gave abuse to the other week i appologise as i had a bad day hope u accept my offer mate

pnbond007

iTrader: (1)

Just a crass noise, mine has gotta go....

Crosstalk

No problem. See you up Waterloo Place on a Saturday night at the wee roundabout, sometime?

scoobie_eccosse

i take it ur from edinburgh then mate? if so no one hangs bout there anymore cos the fed keep bustin everyone?

stevenuk300 still

iTrader: (1)

Decent aftermarket dumpvalves help to speed up the spool of the turbo. I've never heard anything about anything but the standard dumpvalve will make it lose power.

I've got an atmospheric dumpvalve on my UK300 and it certainly doesn't feel slow

briforbes

I bought the blitz one but took it off after a couple of days. People looked at me like I'd just kicked their dog when it went off, and the car ran poorly. Quite happy with the standard valve now and will only be changing if I swap to a front mount.

scoobie_eccosse

lol bet u aint popular wi dog owners then lol its just that i got told at subaru 2 day that after market sound good but make the car loose power now i dont no what to do cos a aftermarket valve does sound good and i was going to buy a blitz one of ebay

Sweepickit

Got a bailey motorsport atmospheric valve on my 95wrx. Don't think it's done the power much harm... Rolling road test on Saturday soon find out what we got.

Bartop

I'm gonna try an adjustable dual vent one - turn the vta right off if yu want or open it up for max chav impact

stevenuk300 still

iTrader: (1)

Keep away from Blitz dumpvalves if you can. Apparently from a reliable car performance source, these are crap on most Jap cars. I have a Forge atmospheric and it's fine. Was looking to change to Blitz before I found out this info.

danwrx1980

According to a guy who runs a very reputable Subaru tuning company, what happens is theAtmospheric dump valves release air that has been metered by the MAF to the atmosphere, so the ECU sets the ignition timing to before there is enough air in the bore. This can cause petrol mist to be forced through into your oil and because the timing is so wrong can cause more wear and generally knacker the car over a long period.
I have also heard stories about turbos wearing excessively as the dump valve releases the pressure too quick and can cause them to run backwards.

Of course if you've had an ECU remap that includes your dump valve in the map you may get a little benefit from it, but without it could just cause your engine to run like ****.

HTH

Dan.

scoobie_eccosse

cheers guys i think the best opyion is to leave the standard dump valve on cheers for all ur input