URGENT HELP! Loss of Boost should I be driving the car?????
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A whirring and hissing sound is not something you want to hear from a turbo engine. Hissing I could get over until I got home but markedly lower boost levels combined with a distinct variable whirring sound would have me pulling the turbo intake elbow and exhaust outlet for a look and feel ASAP. Compressor and or turbine impeller / mainshaft bearing failures can turn ugly $$$$ pretty quick. Typical turbo shaft tolerances are measured with micrometers / dial indicators, any impeller damage or contact with the housing snails is a stop operating immediately condition, if you don't want your engine to ingest a good dose of metal. Any dramatic unexplained loss of performance needs to be investigated. ZD30's pre 07 need some post nissan TLC toensure reliability.
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