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From the Porsche Tech (white) book:
911 Turbo, California and Japan, from 78
5 +- 1 degrees ATDC @ 1000 +- 50 RPM
Vacumn Control detached - no
31 +- 4 degrees BTDC @ 4000 RPM
Vacumn Control detached - yes
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1986 911 Turbo
3.3L, K27HFS, Tial 46mm, TurboKraft Intercooler, 964 Cams, Monty Muffler, MS3Pro Evo, M&W Ignition, Zietronix WBO2 Data Logger, Wevo shifter, coupler and motor mounts.
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