hey guys,

I had been driving all day 1000km highway driving.. stopped for a break and when i started driving again i noticed that the standard turbo in my evo 8 wasnt spooling up. the boost gauge was reading vacuum pressure but when i put my foot down, i noticed the gauge wasnt going any higher then just under zero psi.

I have inspected the vacuum and pressure lines within the engine bay. None of which have any splits in them.. I have inspected the compressor blades of the turbo inlet side for restrictions of the turbine and oil leaks coming from the turbo. Turbine spins freely and no sign of oil leaks. zero axial play of turbine.

I tested the blow off valve and its working fine, but obvisously without the boost pressure the blow off valve affect is minimal.. I have pressure tested the wastegate actuator, ensuring the control rod moves when pressure is applied and i have removed the boost solenoid from the system and plugged the hose straight to the waste gate actuator, taking the solenoid out of the system and still no change.

As far as i can see the intercooler piping is still connected. Next guess might be a leak in the exhaust piping after the turbo, including the dump pipe, cat converter etc.. Is there any way i can test the turbo without removing it if its an internal fault?

I have a HKS TBE, gReddy Intercooler and Lower piping Kit, GFB Blow Off valve, ECU tek Flash, Standard Airbox

Any ideas would be appreciated...

cheers

 

You don't mention any driveability issues... surely with zero boost the car is a pig, right? If you don't really notice it while driving it's obviously a faulty reading, either the gauge input or the gauge itself. If you do have issues, post em up.

 

Even the stock turbo with stock intake you can hear the turbo spooling. Can you hear yours? If no driveability issues are going on then I would try to source a known good gauge to see what your actually getting.

 

Sorry i didnt. Its like im driving a standard lancer. Nil boost felt at all.. The gauge is working fine too.

 

Nah i dont her the turbo spool up, it could be possible for the butterfly valve (internal waste gate) to have ceased open and sheared from the waste gate actuator control rod but hopefully that is not the case..

 

Did you put back the stock boost control solenoid?

It sounds like you have developed a boost leak. If your car was fine all day and doesn't work right now then something popped off.

Post multiple pictures of the engine bay. Maybe someone on here could find something that you could not.

 

Check your cat converter see if it melted. Same thing happened with another member. Drivabilty was fine, no leaks, no boost just a clogged cat.

 

hey guys thanks for your help.. Removed the cat yesterday and found the destroyed turbine.. turbo failure!