Stock turbo failure

[Magic M4]

Has anyone had stock turbos fail without having any of the symptoms of failure. Per my tuner we have ruled out all possible boost leaks and he believes the turbo might be bad. Only getting 16psi before wastgate completely maxout.
55k miles on the turbos.

[RoundelM3]

If your turbos were "bad", you'd hear a loud whine and likely have oil consumption. I would look at the electronic wastegate actuators before deciding to replace turbos - your symptoms of low boost could be an indicator that one or both wastegates aren't closing completely.

[Magic M4]

Originally Posted by RoundelM3

If your turbos were "bad", you'd hear a loud whine and likely have oil consumption. I would look at the electronic wastegate actuators before deciding to replace turbos - your symptoms of low boost could be an indicator that one or both wastegates aren't closing completely.

The wastages pass calibration tests with ista, and they fully shut once I hit 16psi.

[papasmurf_m3]

how much oil does it consume between changes?

[Magic M4]

Originally Posted by papasmurf_m3

how much oil does it consume between changes?

Less then 1qt over 5k miles. Oddly enough the wastgate max out and all possible tests were done and show no boost leaks, my next step is to replace the wastgates, the current ones pass all ista tests but I figure it's worth a shot.

[papasmurf_m3]

that's normal consumption.

Ive gotta set of perfect condition Wastegates if you need em.

[Magic M4]

Originally Posted by papasmurf_m3

that's normal consumption.

Ive gotta set of perfect condition Wastegates if you need em.

Pmed

[RoundelM3]

Originally Posted by Magic M4

The wastages pass calibration tests with ista, and they fully shut once I hit 16psi.

On the surface, what you're describing seems to indicate that the turbos are either not spinning up to full speed (which would normally be a bearing failure with accompanying noise) or some sort of exhaust or boost leak somewhere. There's also the possibility of false readings due to a bad sensor somewhere that is limiting boost. If you can check the wastegate positioning mechanically rather than depending on electronic readings, that would validate what's going on.

It could also be a sensor failure/inaccurate reading for intake air temp, oil temperature, coolant temp, exhaust gas temp, cylinder head temp, detonation, or any other reading that would cause the DME to pull back boost to prevent engine damage. I'd eliminate that as a factor before investing in replacing your turbos.

[Magic M4]

Found the issue



Cylinder 1: 190psi
Cylinder 2: 190 psi
Cylinder 3: 180 psi
Cylinder 4: 195psi
Cylinder 5: 195 psi
Cylinder 6: 195 psi

Leak down results:

Cylinder 1: 10% leak down
Cylinder 2: 12% leak down
Cylinder 3: 25% leak down (Coming from exhaust)
Cylinder 4: 10% leak down
Cylinder 5: 15% leak down
Cylinder 6 10% leak down

[TopJimmy]

Originally Posted by Magic M4

Found the issue



Cylinder 1: 190psi
Cylinder 2: 190 psi
Cylinder 3: 180 psi
Cylinder 4: 195psi
Cylinder 5: 195 psi
Cylinder 6: 195 psi

Leak down results:

Cylinder 1: 10% leak down
Cylinder 2: 12% leak down
Cylinder 3: 25% leak down (Coming from exhaust)
Cylinder 4: 10% leak down
Cylinder 5: 15% leak down
Cylinder 6 10% leak down

Friggin owwwwwch!
Bad valve?

If yes, Headgames in NJ is the best.