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C900 Vaccuum advance theory + MSD BTM Question
Posted by saabrobaz [Email] (more from saabrobaz) on Wed, 30 Aug 2006 15:00:33
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As a preface, my car seems to be working now with the MSD-6 BTM installed.
There's just one sticking point, though...
In order to make it work I modified the vaccuum advance so that it ONLY advances (as it does stock), and does not retard at all. This setup seems to work, but earlier this week I modified another vac advance to NOT MOVE the actuator arm at all, and this just killed all power and made the engine ping badly under boost/load but not just idling or cruising.
The question is: Why does advance matter at all under boost? When the engine is boosting, it retards timing anyhow, right?
Thanks In Advance Y'all,
Rob and Cole (87 SPG)
-Looking for some wisdom
posted by 68.142.6...
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