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[quote][i]Originally posted by Nick-S[/i] To put it as simply as possible, this phenomenon is caused when the pressure ratio across the compressor side of the turbo becomes large enough to cause a flow reversal aross the compressor wheel. In effect the pressure in the intake manifold downstream of the turbo becomes high enough for air to flow backwards through the turbo for a split second. This has the effect of lowering the pressure in the manifold, and hence causing the flow reversal to stop. Of course as soon as this occurs the pressure downstream of the compressor can recover again and the whole process is repeated. This will happen at a fairly low frequency - say a couple of hertz and the pressure waves present in the inlet tract as a result will be audible. as sed by a cosworth enginer. this is what causes chatter. not the waste gate [/quote]
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