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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
 
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 12,690
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You are correct, the vacuum pot(s) only retards the timing during off-boost events.
Contrary to popular belief, the '78/9 distributor does NOT retard timing under boost. You can blow on that bugger 'till your eyes pop out and it won't retard the timing.
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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
Old 01-30-2007, 10:34 AM
  Pelican Parts Technical Article Directory    Reply With Quote #12 (permalink)