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Join Date: Jul 2006
Location: Brandon, FL
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Originally Posted by RarlyL8 View Post
I hesitate to get into this but will throw in what I have experienced from tuning my own car.
The 930 dizzy does not retard on boost. What it does is retard in the absense of vacuum. That is why you do not see the mechanism move when pressure is applied to the pot.
Same here. While in vacuum, the dizzy is held "advanced" for lack of a better term. As vacuum decreases, the mechanism retards proportionally until zero vacuum is present at which point you have full "retard". The "advance" and "retard" is governed by the amount of vacuum at the pot, not pressure. So, at idle you may have full "advance" (high vacuum) but at full boost you will have full "retard" (zero vacuum).
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Old 09-11-2007, 08:44 AM
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