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Old 03-15-2011, 05:51 PM   #39 (permalink)
htvfd460
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Join Date: Mar 2011
Location: NJ
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American - '06 Ford Ranger STX
90 day: 27.05 mpg (US)
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That is right. On a turbo diesel manifold vacuum is bad. Diesels require high compression to get fuel to it's flash point, running at 18:1 like a Powerstroke isn't enough so the turbo needs to feed more air to reach over 21:1 for proper combustion. Even at idle there is no vacuum.
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