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Issue under full boost?

790 views 3 replies 4 participants last post by  DickSRT 
#1 ·
For some reason under WOT, the turbo seems to sputter and I don't know what it could be. I don't know how to explain it, but under full boost it sounds kind of like pshpshhpshhh.

I bought the car with a catless dp on it, and the owner gave me the stock one to pass smog. After I put the stock one on, it seemed to start doing this. Could it be an exhaust leak?
 
#2 ·
Possible, but have you ruled out intake charge pipe leaks, vacuum leaks, checked the spark plugs, etc.? A post-turbo exhaust leak shouldn't cause an issue you're describing as far as drivability since the O2 sensor is mounted in the elbow/O2 housing above the downpipe assembly and at WOT the computer isn't even using the stock narrowband O2 sensor.
 
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