KEVWRX95

I am currently changing the black rubber pipes on the boost solenoid to blue silicone ones, however I have been led to believe that one of the black rubber pipes may contain a restrictor of some sort?
Can anyone confirm this, also which pipe would it be?
As I believe that if there is no restrictor this could cause over boost?
I have checked all four of the rubber ones and can't see anything obvious.
I have a Jap WRX 95 with four pipes coming out of the solenoid.Thanks to all the people in the know for replying gto this.
Kev.

Nezz10

There was one in the pipes leading to my boost solenoid but was removed by Bob at a mapping session cause I have the link!

KEVWRX95

Cheers Nezz
I would have thought the restrictor would be in the pipe that leads from the solenoid to the wastegate but after bending it and playing with it (ooh eer) i could not find anything, so I'm assuming it's in one of the others????? maybe I'm not looking hard enough?????????????????????????????????
Does anyone know what the car will do if there is no restrictor in any of the pipes?

Bob Rawle

Soft blue silicone pipes ..... these are not designed for pressure only vaccuum so don't do it if they have to carry pressure.

Restrictors ... depending on MY, up to MY 96 inc there is a 2 mm restrictor in the lower vent pipe leading from the solenoid to the intake. MY97 on the restrictor is between the turbo outlet and the plastic tee piece.

On early cars removing will improve boost response (usually with boost cut being hit though), on later cars removing kills boost response and its this restrictor that causes overboost when it gets blocked.

bob

*Sonic*

On mine (MY00 UK) with no restrictor in, im stuck at 9PSI

Thats when I realised when I ordered new pipes, I should have bought the restrictor too

They cost a lot of money from a Main Dealer, 25 quid inc VAT for the 2 pipes, T Piece & Restrictor, one of the pipes (the right angled one) was 13 quid !!!!

The restrictor on a MY00 is allegedly 1.2mm and I think the PPP one is 0.8mm or the other way round

The restrictor AFAIK goes in the Turbo side to T-Peice, at least thats how it is shown on Subaru Parts



Steve

SPARKY WRX

Bob,

I have a 94 wrx, I am just about to fit an Apexi AVC-R, would I benifit from removing the restrictor at the same time. And would the use of the Apexi AVC-R stop it hiting the boost cut because it controls the boost with its own soleniod.

Thanks

Mark