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Originally Posted by EchoOfSilence
Woah, we need more info on this. bjorkluv, i think it's time for an explanation on compressor surge
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well I am gonna guess you are serious and not messing with me here...in my own words, to get compressor surge, floor the car, build boost, let go of the aacelerator or shift and Bam compressor surge....as long as you dont have a BOV or your BOV is so tight that it doesn't release pressure you get some or a lot of surge...The throttle plate slams shut and the air is forced back towards the compressor at a higher velocity than is traveling from the compressor. Here is a cut and paste from a NPM article in more technical terms..
"Surge occurs when the air pressure after the compressor is higher than the compressor can generate. This causes the airflow in the compressor wheel to back up and stall. This, in turn, causes the pressure to drop, allowing flow to resume until it stalls again. In severe surge this can become a violent oscillation that destroys the thrust bearing of the turbo and can even cause mechanical failure of the wheel. Surge can feel like anything from a slight fall off in power to a violent jerking when driving. Surge also makes a thrumming or chirping noise that can be distinctly heard over the engine. You'll often hear compressor surge during shifts, if the compressor bypass valve (or blow-off valve) is too small. Obviously surging any time other than during a shift is not good stuff, so any compressor match should avoid crossing over or dwelling in the surge area of the map especially after the wastegate opens"