Boost Problems

[alec172]

It started about 2 months ago.

It was the end of winter so I had my OEM turbo pipes and air box, my custom cat-less downpipe with MIL eliminator + Racing Beat catback. I felt that the car was slow to respond when I was hiting the accelerator. The boost quickly jumps to 0 then progresses slowly to 6 psi.

I changed all vaccums lines to the wastegate and BPV and nothing.

I changed the OEM WGA for an ATP WGA and nothing.

I installed the summer gear: Street Unit SMIC + Hot and cold pipes, Injen CAI, Forge BPV and.....nothing.

It seems that the condition gets worse with heat.

When I installed the new wastegate actuator, I noticed oil seeming through some of the turbo connections; not a big surprise since the car has 99,500 km (about 60K miles).

I'm trying to convince myself that the turbo is still good even though I have been driving the car with all these mods since the car original purchase in 2003.

Am I missing something here? A faulty TB maybe? Fuel pump?

Thanks for your help.

[alec172]

Anybody has any ideas?

I'm pretty sure that the turbo is U/S; most probable the wastegate itself is tired. Sometimes, the delay at wich the turbo goes to full boosts varies. Weird.

[alec172]

I noticed something else today:

If you accelerate from 0-60, the car boosts pretty well. Once I leave it in gear at a steady speed, then downshifts to accelerate, then the boost guage quickly jumps to 0psi then slowly boosts up to 9psi.

Feels just like the worse turbo lag ever.

[orng1]

How much oil are you losing, how do the plugs look. Clean out the pipes and seafoam the car, see if that makes it feel better.