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The spec for the non-calif, typical 78 USA Model
From the Porsche Tech (white) book:
911 Turbo, USA (not CA), from 78
10 +- 2 degrees ATDC @ 1000 +- 50 RPM
Vacumn Control detached - no
26 +- 4 degrees BTDC @ 4000 RPM
Vacumn Control detached - yes
That looks like what your manual shows.
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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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