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J,
I have been reading posts and trying to better understand how a 930 ignition system works.
I was thinking of opening a new thread on this but hoped you could help.
I am leaving out or not interested the little extra valves for now that modify the vac/boost signals to the Dist.
Can you help me with the following:
What is the mechanical advance delta. Or, if a US dist is set at -25 deg w/o any vac lines, what would we expect to see the timing be w/o the vac/boost lines hooked up at idle?
What is the delta or total additional amount the Vac Advance that the vac-can, can add to timming? That is, if we ran the car above 4000rpm at cruse and were timed at 25 deg base, how much addational advance could we potentaly see?
Can you confirm that the can on the side of the 930 truly only advances timing. It can not retard it. That the only retarding it dose it pull back the vac advance that was added by it?
Do you know why the 3.0 turbos only had a vac/boost line to one side of the advance can and why they changed to a vac/boost line to each side of the can with the 3.3?
I assume the vac line on the outside of the vac advance can is a normal intake manifold signal from after the throttle body. Is that right?
Where dose the other come from and what type of signal is it?
Thanks for your help in the past and here if you can help me again.
I just love trying to better understand these cars.
The best,
Keith
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