FWIW, Steve had two things to say when I asked about setting timing for my stock 930 track car (which, btw, has been running for who knows how long with the boost retard hose connected):
(1) Set timing at 10 deg ± 2 deg ATDC with the vacuum control connected.
(2) Factory spec is vacuum retard connected and if its run without it being functional, you WILL destroy P/C's.
At no time did he address max retard under boost.
That said, my local mechanic's opinion was to leave the boost hose disconnected and set the timing at 22 degrees ...
Last edited by rs911t; 11-19-2006 at 09:06 AM..