Ok first off I have searched!! I just bought my 05 STI about 3 weeks ago and the car was running great, till about 2 Nights ago i was driving home from work when i lost boost pressure, the check engine light was on and of course the cruse light was flashing. well when i got home i plug in my scan tool and code was to check the wastegate i checked it, and the Wastegate vaccum line was riped in half, i replaced the line and no more check engine light but the car still wont boost... i looked at every line i can think of but still nothing max pressure right now .07

Heres the Mods list if it helps
HKS catback
Tein coilovers with edfc
Apex Turbo Timmer
And DEFI Gauges.

any info helps thank you...

 

Were talking like 0 boost at all???????

I had the same thing happen to me as I was driving my brand new used subie home from the dealership.....

The hose from the turbo to the intercooler popped off, I have also had the hose from the intercooler to the throttle body pop off.

Other than catastrophic turbo failure I would think checking these two things and making sure your wastegate is not stuck fully open should at least produce a little bit of boost.

 

Sorry the car does boost but only about 8psi.. i checked the hoses there all fine but i cant do much more because the car is under warranty which i dont want to void... I got the car from a GMC dealer in seaside which is about, 2hours from were i live i called them last night and they told me to bring it in, which i dont understand because GMC dont work on subaru this is not the first problem i had with the car!!

 

maybe you routed a boost line wrong? 8psi sounds like its only boosting wastegate spring pressure

 

You might have removed the vacuum line that contains the restrictor pill.

Look at the diagram near the bottom of this page and see if it's the line you replaced.

CobbTuning.com - Service Bulletin: 07 WRX/STi Overboosting with Catless Exhaust

 

The only line i replaced was the one that runs from the wastegate to the solenoid didnt pull off any other line checked them but didnt remove i would post a pic of what i was talking about but i took the car to the shop already... tell you one thing theses motors are alot different then the sr20 i was use to working on!!!!

 

Re-set ECU
Then check for vacuum leaks again
You May have to pressurize your system to check for leaks. Some leaks you can't see with the naked eye.

also, you not only want to check the lines, but you also need to check the components that the lines are connected too. For example, Your lines may be fine, but your wastegate may have a leak and is not holding pressure.

 

Did you fix this? What was the issue?

 

yes problem was a vaccum line... only thing is the car was running about 20psi with little to no Turbo lag before the wastegate line riped. now the car hits stock psi but i can feel big difference in power with more lag?

 

Is there a restrictor pill in the STI????? If so did you ensure when you replaced the vaccum line the proper pill was in there? This is the line where the pill would reside....

 

Bet you its the restrictor pill that isnt in the line. Double check that before you boost and blow it up. Gotta have that in there