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Notice that in nearly all BSFC graphs the best spot is at low vacuum but at an engine speed where the pistons are moving less than 1500 feet per minute.
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Thinking EFI on an earlier built car, which ofcourse is lacking EGR;
What would one think of, instead of normally optimizing ignition timing at cruise rpm, now retarding ignition timing instead. Letting the engine get a bit less eficient so more throttle is needed to maintain speed.
More throttle, less vacuum (with same speed).
Would this have a similar effect as an EGR?
