johnny_in_uk

hi after coming from the cosworth family to subaru, i own a 2003 wrx sti ppp

i was told by former owner that my subaru isnt recomended a dump valve for reasons as runing problems, is that correct.... and lastly my engine management light came on dash fri eve my mate turned it off by pluggin sumthing into car,tonight it has came back on ..when it was turned of it said knock sensor fault? can car still be driven and how expensive is job to fix properly,,,many thanks john

musso2010

Imprezas dont like VTA dump valves. I had one on mine, and binned it a few months later.

If your getting a knock sensor fault, you can drive the car, but keep off the boost. Knock sensor isnt to expensive and is only 15mins to fit.

johnny_in_uk

oh so guy was rite.... ty 4 ur help the light has cured itself and gone away....so a dump valve a no no then.....

musso2010

Imo yeah. I had lots of problems with a dump valve fitted. Eratic idle, loss of boost, engine stalls. Best leave the dump valves alone.

johnny_in_uk

how do i put a pic up like u have

musso2010

User CP-->Setting and options-->Edit avatar.
You will need to resize it first, use photobucket.com for that mate.

johnny_in_uk

i have do have some on photobucket but this all new to me..havent a clue

Rob Day

iTrader: (78)

Imho some dump valves are ok, but tbh they just ruin eveything thats good about an impreza, yes I agree the Wooosh noise occasionanly is nice, but 9 times out of 10 its just so inappropriate. Other than as said above, the car with a aftermarket DV usually ascertains poor excessive revs between boost gear changes... They just are not worth it. On my last car which had a Baileys on when bought, was fitted with a Vee-port which I believe was one of the better DV's, however this was constantly tweaked to try and get the car to run propely, but I found that If I tightened up the spring the car would then start to struggle to dump, and then turbo chudder, if the spring was slackened off it would woosh almost all the time, thus not holding boost properly.

So in a nut shell - They are s_it, but horses for courses!

Rob