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spudsti

BD5 twin turbo questions

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Ive been doing a lot of reading but now looking for some advice from people in the know. Ive replaced a couple of dodgy aftermarket vaccum lines which has made it run better, but still mostly the same. I havent yet removed the intercooler to replace those pipes with silicon ones. 

 

here are the symptoms currently:

- Sometimes the car feels gutless, although boost gauge registers boost it just sits below 10psi all the way to redline (slight VOD feeling)

 

- Even when it pulls well it gets to 10psi just under 4500rpm, then hits VOD, drops back to 5psi and then gets to 12psi until redline. Albeit the surge of power kicks quite late in the rpm, so you dont have much before redline

 

- primary turbo has its own actuator ( vacuum pipe disconnected) as well as the one the twin turbo system uses (connected)

 

will have to verify the RPM next time im driving it

 

the above seem right? Any advice or tips on where to start?

 

are the solenoids in the passenger gaurd and the main one in the BBoD replaceable with new genuine, or even aftermarket parts?

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I've got no real idea with these, but have you confirmed all vac line restrictors are in place? Could have been one in one of the line the last guy replaced causing issues.

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Looks like the lines are factory as they are all numbered. Doesn’t appear to be any restrictors in any of the lines i changed either

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Hi Spud, where are you based?

The twin-turbo system is quite tricky if you are not familiar with it. 

I recommend taking it to a Subaru Specialist as they can diagnose it quickly. 

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