Thread: Ignition Timing
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930turbo 930turbo is offline
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Join Date: Jul 2006
Location: Valrico Florida
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You can check both. The total advance is important for detination as others have indicated, however, the idle setting is important for more than just emissions. Your intake vacuum at idle will vary significatly with initial timing. Intake vacuum has an influence on mixture via the control pressure regulator. For example, if your initial timing is too advanced, your vacuum will be above design and cause the mixture to go lean. It is best to have the timing correct on both ends of the curve to avoid compromising other things in your quest for the perfect tune.
'77 930 turbo Garretson I/C 1 BAR spring, (2) '82 Triumph Bonneville Royal Wedding Edition
Past rides: '74 914 1.9 liter twin plugged track car, '83 928S, '87 924S, '75 911S w '78 ROW 3.0, '72 911T, '70 911T and various other insignificant domestic examples. Happiness is a grey tailpipe! Turbo's worth the wait!
Old 02-10-2009, 06:19 AM
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