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Old 11-29-2005, 06:17 PM   #1
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Vacuum operated accessories under boost?
Can someone explain to me how vacuum operated accessories such as a distibutor still work well under boost?
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Old 11-29-2005, 06:23 PM   #2
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You don't want vacuum advance under boost, any more than you'd want it at WOT in a NA car. In fact, you probably want the timing retarded. Before electronic boost-retard boxes came out, you could get boost-retard/vacuum advance diaphragms.
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Old 11-29-2005, 06:30 PM   #3
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So can I still run a vacuum advance distributor? With a BTM? Or get a mechanical one?
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Old 11-29-2005, 06:37 PM   #4
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I don't even know if you can still get mechanical boost retard cans, an electronic one would probably be better anyway.
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Old 11-29-2005, 07:57 PM   #5
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so would I just disconnect the vac hose and use a btm?
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Old 11-29-2005, 08:04 PM   #6
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You'd still have a vacuum advance can for part throttle advance, but under boost the BTM would be retarding the timing.
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Old 11-30-2005, 06:30 AM   #7
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I see. Im planning on running water/alky inj. I need to do some more research though. I would think that I wouldnt need a BTM if I did that. Thanks for the help.
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Old 11-30-2005, 06:30 AM
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