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Message: <blockquote data-quote="C5Performance" data-source="post: 95709" data-attributes="member: 2938">To answer the first question as best i can:There are a few levels of change when dealing with advance curves. I will try to explain in basic terms.Magneto: These are set at one place. You can retard them to get the engine running, but they operate at ONE setting.Points/Triggers: Points operate on rpm only using weights and springs. GL1000 is an example. Triggers like the GL1100 use a vacuum advance to fine tune timing based on "load". When you go up a steep hill, you open the throttle, the vacuum drops, and the advancer allows the timing to drop back down (less advance).Sensors/Mapping: Some ignitions sense vacuum (Harley), some use a digital sensor (MAP sensor) and I will use Yamaha as an example...they had 3D mapping. It used engine rpm, throttle position, and vacuum to determine where to place timing. You can run the PowerArc system using straight up timing like a Magneto, or with a vacuum sensor like a Harley, or even use a MAP sensor that converts a vacuum signal to digital and uses voltage changes to control curves. One thing to remember...with a mag you have NO adjustment. With all points systems you have only the weight of the arms, and hopefully the accuracy of the springs, and with your vacuum system, as Dan stated (his leaked) you had a crude rotating bearing and small plunger to adjust your timing. Even if you never used any vacuum input to adjust your curve, you will still see a significant improvement in performance and efficiency simply from having electronics control your curve, and dont forget the multiple spark advantages.I want to explain timing in the next reply, before i get into multi sparking, if thats ok with you guys  :thanks:</blockquote>

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