Check your filters before digging too deep. A plugged filter could restrict the fuel enough to prevent boost from building. 30 seconds sounds really slow for a 603 NA (which what your engine essentially is with no boost). The 5-cyl 602 in my 124 was giving me 18 second 0-60's with the wastegate held open by a bad transducer, so I would guess a 603 with a similar situation would be a little faster than 18.

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Dale

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