what is compressor surge

[brandons 95]

I am not sure exactly what compressor surge is, or what causes it can someone please explain it. thanks

 

[dherron]

All I know is that compressor surge usually occurs in turbos such as the Holset HX35s and bigger that are designed to run like 30+ psi all the time. By cutting the boost to around 20 psi the thing surge so to speak.

 

[ericbev]

Compressor surge is when the air pressure after the compressor is actually higher than what the compressor itself can physically maintain. This condition causes the airflow in the compressor wheel to back up, build pressure, and sometimes stall. In cases of extreme surge, the thrust bearings of the turbo can be destroyed, and will sometimes even lead to mechanical failure of the compressor wheel itself. It is commonly described as a chuffing or fluttering sound depending on the severity. You will know it when you hear it.