Hello,
It has been a while. I bought my Z in 2013, sold it to my nephew in 2016, and bought it back last year. I took the plunge and had Speed and Sport in Arizona dyno tune it before I brought it back to Minnesota. Results below are at 10PSI max boost with pump gas.
Motor info:
CNC machined block with prepped crank and rods, ARP hardware
9:1 JE forged pistons .080 over with Total Seal zero gap second rings. Measured compression 8.65
Cometic gasket
Ported P90 head with Comp Cams 84-123-6 camshaft .420 lift, 214@050, 110 centers 4 degrees advanced.
Holley EFI with Holley wasted spark ignition and "Super 60" 550cc injectors.
Roto Master t04B turbo with .7AR 70 trim compressor, .58AR 62 trim turbine (as best as I can tell)
Sparco intercooler, ported inlet, ported exhaust converted to t04 flange.
2.5" downpipe with 3" exhaust and Flowmaster muffler.
I have included the head flowbench graph and a picture of the install. Right now I am knock limited at around 12psi with pump gas so there isn't a lot more there unless I change fuels or go back into the motor. I tried retarding the timing and it didn't help much and I am already at 11.3 AF. I will try again next year.
The motor runs like a factory setup other than the idle is around 1k RPM. It is a joy to drive on the street. The turbo is old school and a bit laggy but not bad enough that I feel the need for a new one.
Bill