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Originally Posted by raddy
there is big difference in surge during shifting (caused by closed throttle) and surge during full engine (and turbo) load. First one is almost not damaging turbo, but second one is very destructive to turbo. So, if you experience surge during turbo spool up, it is allways worth to worry about it.
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how do you figure?
the reason it occurs is exactly the same: too high a pr and too low a flow rate causes the operating point to cross the "surge line" of the compressor characteristic.
the turbo doesn't know the difference. the engine is a "black box" into which it crams air and out of which flows hot exhaust gasses under pressure.
i push the crap out of my vf23 and it surges on cold days in high load/low rpm situations. chuff chuff chuff! that's how i know i'm getting my money's worth. :lol:
ken