scooby seb

iTrader: (1)

hi all changed all my vacum pipe's today for after market silicone hose today on my 97 ver 3 sti, but on my drive home found car won't boost over 0.6 bar where as it used to peak at 1.3 then drop back to 1.0 bar and hold fine, all pipes are on in the correct order as a changed one at a time and all fitted securely!!! have i missed somthing, is there a restrictor in one of the pipe's or could the pipe be to small (it's 2mm i think!!)

cheers scott

frayz

iTrader: (7)

Yup,

Youve taken out the restrictor bullet in the vac line between the boost solenoid and the turbo compressor housing/wastegate actuator.

Check the old lines for the small brass bullet and place it in the new vac lines.

Be sure to put it back in the same line/location that you removed it from.

scooby seb

iTrader: (1)

cheers fella will check the old one's tomorrow

frayz

iTrader: (7)

The pill will be on the pipe that goes to the turbo compressor housing. That same line will be on the run of the tee that goes to the actuator. The tee then goes to the boost control solenoid.

Here, this might help you understand whats going on a bit better and also shows a diagram of the boost pill.

How Subaru's Factory Boost Control System Works v1[1] 01

scooby seb

iTrader: (1)

lovely biscuits, yeah i know the one,was in 2 mind's to change that pipe as you don't really see it, cheers again

Rob Day

iTrader: (78)

I assume the OP has a classic, I thought without a pill it would over boost where as newage is the other way around (no pill no boost)... I could be wrong but just covering all avenues.

scooby seb

iTrader: (1)

just found and fitted the restrictor and took it down the road, all good and back to normal

cheers for ya help frayz

WRX_Dazza

did some one mention biscuits????

nice work Frayz

frayz

iTrader: (7)

Welcome chap