Just to clarify, the higher the vacuum the further the FPR opens to allow more fuel correct?
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Ma che cazzo state dicendo? :| -
Its the opposite. When you have high vacuum(idle/decel) the fuel pressure is lower, lower vacuum(WOT/boost) the fuel pressure is higher. -
Correct. high vacuum reduces rail fuel pressure. The only time one has high vacuum in the intake is when the throttle is closed and thus the need for fuel is reduced.The car makes it possible, but the driver makes it happen.
Jim Levie, Huntsville, ALComment
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When I say high vacuum I mean say 20 inches. When I say low vacuum I mean 5 inches. Maybe my logic is backwards. In our industry a high vacuum is 2 torr. A low vacuum is 150 torr (closer to atmosphere)Ma che cazzo state dicendo? :|Comment
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And I believe we are saying the same, more vacuum opens the FPR further and decreases fuel pressure in the rail
~20"Hg / idle opens the FPR and decreases fuel pressure = less fuel
0"Hg/atmosphere / WOT closes FPR and allows more fuel pressue = more fuel
Positive pressure / boost allows even more fuel by closing the FPR further increasing the rail pressureLast edited by whodwho; 09-03-2011, 05:54 AM.Comment
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I thought the vacuum increases as the throttle opens. Learn something new everyday. Im such a n00b.Ma che cazzo state dicendo? :|Comment
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