2000redrocket
Pro
Posts: 1662
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posted December 27, 2009 06:15 PM
that surge you talk about. is that the pressure comming back out through the compressure when you loose bost that makes a sort of banging sound?
  
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ZRXDean
Needs a job
Posts: 2225
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posted December 28, 2009 05:48 AM
Yep, surge is flow reversal in the compressor, if the engine cannot use what it's being fed, it must go somewhere. On the compressor map, high pressure with low flow (upper left quadrant) will put you in surge. When the flow reverses, suddenly the pressure is released, and then the compressor wheel spins up again rapidly, reverses again, spins again, etc, and this creates the banging noise. I haven't experienced it myself, but I'm not interested in trying it, I paid too much for the turbo.
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2000redrocket
Pro
Posts: 1662
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posted December 28, 2009 02:32 PM
my dodge would do that all the time when pulling at the fair as the engine pulled down. and on the street most of the time also while i could lay the needle on the 50psi peg. now with 4 turns out of the rack travil it only done it with a heavy trailer. super stock guys say that noise on the smaller turbos usually is followed by snapping the shaft. he said i should be carefull. well then i got out of it anyway.
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aliveagain
Needs a life
Posts: 5033
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posted December 28, 2009 07:02 PM
My truck will do that if I'm pulling hard up a hill and let off suddenly.Wondered about the bearings and seal whenever.
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I wondered why the baseball kept getting bigger. Then it hit me.
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2000redrocket
Pro
Posts: 1662
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posted December 29, 2009 02:36 AM
it is not a seal like a bike would have. not to worry.
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