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The vacuum effect on my E accounts for 10 degrees. At idle it's set at 5 degrees ATDC. Disconnect the hose (or crack the throttle) and it goes to 5 degrees BTDC. With this stock set up you can get max, safe advance at redline and a properly timed, smooth engine at idle. Thats why Porsche designed it that way. Without the vacuum you loose 10 degrees of the curve.
Chris
73 911 E
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