Advance is mechanical.
Retard is vacuum only.
Boost is not registered by the distributor.
The Euro single pot vacuum retard is not very agressive and is best left alone.
If you wish to maximise the timing curve you can mechanically block the retard function and set the timing at 28* total. The timing will come in as quickly as your block allows. Always back up your tuning with a dyno run or an LM-1. Boost and detonation do not mix.
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8