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It could be a couple things, if it is a stock turbo? It could be damaged( compressor/turbine wheel). If it spins freely and no visible damage, you would need to check for exhaust and compressor piping for leaks.

If it is an aftermarket turbo or turbo installed on an engine that didn't come with one. Other than the causes above, the turbo or turbine housing is too large and their isn't enough exhaust volume to spool the turbo up in your operating rpm range.

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12y ago

What else can I help you with?