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Old 09-28-2014, 02:18 PM   #1
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Default When does your EcoBoost Intake Pressure go Positive?

For those who have an indication of boost pressure, I am curious as to when the intake pressure goes positive and as a result the PCV valve goes shut? Trying to figure out how much of the time the crankcase ventilation is being pulled by negative intake manifold pressure.

I assume during city driving it will go positive during acceleration, but most of the other time it is negative? And at highway speeds when not towing is it negative or positive? When towing at what steady speed does it go positive?
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Old Yesterday, 11:24 AM   #2
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I take it that nobody has indication of the boost pressure or monitors it?
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Old Yesterday, 11:38 AM   #3
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I do. I know it goes positive a fair bit, but I am tuned for more power, so not sure how much of a direct corollary I'd be. If you still want my input knowing i'm tuned (and mods in sig) then i'll post up when i look at the levels on the way home
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Old Yesterday, 01:35 PM   #4
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Quote:
Originally Posted by torinalth View Post
I do. I know it goes positive a fair bit, but I am tuned for more power, so not sure how much of a direct corollary I'd be. If you still want my input knowing i'm tuned (and mods in sig) then i'll post up when i look at the levels on the way home

Sure, I would be interested. I'll take it as a conservative estimate as to when boost starts, and the stock setup is most likely to be later.
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Old Yesterday, 01:48 PM   #5
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My EcoBoost didn't come with a boost gauge
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Old Yesterday, 03:02 PM   #6
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My Ford spends most of it's time pulling my trailer.


The only time it isn't making boost is going down hill.


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Old Yesterday, 07:50 PM   #7
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My Ford spends most of it's time pulling my trailer.
The only time it isn't making boost is going down hill.

Thanks for the info.
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Old Today, 10:31 AM   #8
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mine is the same. on flat ground at 60 mph I'm between 1-2 PSI. I slightly droop below 0 into vacuum when going down hill, but unless I take my foot off the gas it never really drops low into vac. at normal acceleration i'm roughly around 5psi. makes sense why I am lower on MPG since I am always making SOME boost.
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Old Today, 11:31 AM   #9
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Quote:
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mine is the same. on flat ground at 60 mph I'm between 1-2 PSI. I slightly droop below 0 into vacuum when going down hill, but unless I take my foot off the gas it never really drops low into vac. at normal acceleration i'm roughly around 5psi. makes sense why I am lower on MPG since I am always making SOME boost.

Thank you. I presume that is while you are not towing?
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