Limit total advance???

[azfordman]

Originally Posted by lnfletcher

A little more information.
http://dnr.louisiana.gov/sec/execdiv...p/auto/h/h.htm
http://www.sweptline.com/tech/engine2.html
I run a vacuum advanced to help with my idle. When my base and mech are set correctly, my idle is pretty bad because of the cam I'm running and the vac advance helps smooth it a little.

Interesting reading. Although the thing that is still confusing me is the following...

"Vacuum advance also adds timing to the engine, but it is based on engine load and is controlled by intake manifold vacuum. When the throttle is partially open (highway cruising), manifold vacuum is high. This vacuum signal is routed to the distributor and "pulls" on the vacuum advance canister to create more ignition timing. As the throttle opening increases, load increases and manifold vacuum decreases. At wide open throttle (WOT), manifold vacuum is at or near zero and the vacuum advance produces no additional ignition timing."

Almost everything I read says the vacuum in the manifold should be dropping to almost zero with the throttle wide open....so the vacuum advance does not come into play. For mild mannered street driving I am not having any issues, but on the occasion I decide to stand on it and go all out, is when this vacuum advance issue is kicking in. Am I the only one who has this issue? Again, when everything I read contradicts what is happening with this car it just makes me wonder what is going on. Ahhhh....the joys of a light weight car with a big engine!!!