Damn you guys posted with haste to this thread!
There is no such thing as a JDM L28ET - they were USDM only.
Get photo's of the engine number, block casting, head casting and what kind of triggering system is in use.
The early turbo's had a N42/N42 or N42/P79 with crank trigger and empty distributor (no electronics). The 'S2' turbo had the F54/P90/optical distributor setup.
If this donk is an L28ET and ex-Japan, then chances are its from a USDM imported 280ZXT. The JDM Fairlady 280ZX Turbo ran the L20AET.
A T2 would be very average, sure it might spool up quick, but with a 2.8 it would run out of puff at 4000rpm (if that). T2 is Pulsar ET turbo (E15T) size, or about the same as a single from a 1G-GTE twin-turbo...
My old N42/N42 L28ET ran a VG30ET T3 with a T4 compressor and over-bored turbine housing - low-rpm boost wasn't an issue. I would almost wager that it spooled quicker than a stock RB25DET does.