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Well there's a lot that goes into spool times.
Compressor size, trim A/R, turbine size, trim and housing type and A/R, oil flow to the turbo, bearing type volume of piping and intercooler.
If you only intend to run single digit psi then compile a list of smaller turbos that have a high trim number on the compressor. Those will be more efficient at lower psi and will move more air faster at lower engine loads.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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