ZD30's use a variable nozzle Turbo so turbo lag is significantly reduced in those engines.
VNT lets the Turbo stay spinning at much higher revs and adjust vane angle for boost which is heaps faster response than waiting for a fixed Turbo to spin up.
Turbo lag is there but no where near as noticeably as non-vnt jobbies.
The other way they reduce Turbo lag is compound turbos, common in light trucks etc.
Turbo surge is another issue in the ZD30's and is one of the reasons the oily goo gets "upstream" in the airflow and coats your MAF etc
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