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Somatic Negative Optimist
Join Date: Mar 2002
Location: Winlaw, BC, Canada
Posts: 7,206
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CIS and timing experts: Total advance connection at TB and total advance possible.
The vac advance is supposed to be above the butterfly (In front of the TB) and the retard on '80-'83 below the butterfly) Rear of TB).
Is this correct?
Even at 850 RPM, there is strong suction above the butterfly on the advance line pulling the full ~5 deg in idle.
Some thoughts:
Porsche states to set timing at 5deg with vac disconnected for SC's.
That would mean that Porsche recognized the effect of the vacuum even at idle???
More observations:
I retarded the timing to a total of 29-30 max. vac connected which leaves the timing at 8-9 deg in idle with vac re-connected.
(If I set it 30-32, it'll be 10-11 deg vac connected)
At this point, I wonder about the total advance possible with the SC-distributors?
I have 3 distributors to play with: '78, '80 and '82.
They appear to perform the same.
Any thoughts?
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD!
1995 seafoam-green 993 C2, LSD, Sport seats. 
Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ". 
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