now this is interesting

[7.3HeavyHauler]

today just a few minutes ago i changed the oil in my truck, I went from 15/40 to 5/20 yes its for diesels and its motorcraft, got a hot sale on it, anyways my boost went from 13 psi to 16, before this oil change i could not get past 13, I am almost positive i could have gotten more but i was already at 95mph and i know i was pretty close the the rev limiter so i let off. who knew?!?!

[Schnot]

Only 13 psi of boost? That's awfully low.


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[7.3HeavyHauler]

Yeah I thought that too, I need new boots, I tried to clean up the ones I have but that is probably part of the problem

[jesilvas]

16 really is kinda low ish too.
But that's interesting. I bet that's because it could flow through the LPOP, HPOP, and subsequent places easier, allowing for quicker injection events.
If that's the case, I'd look at maybe IPR or ICP issues maybe.

[7.3HeavyHauler]

Might have to do that

[gomer pyle]

pretty sure the 5w20 is for the 6.7s. i wonder if it meets all the requirements for our 7.3s?

[jesilvas]

Originally Posted by gomer pyle

pretty sure the 5w20 is for the 6.7s. i wonder if it meets all the requirements for our 7.3s?

Probably not on the high temp end

I made my Samsung SGH-I997 send this.

[Schnot]

Is your gauge sensor in the right spot? I made the mistake of tapping into the hot side of the spider and only seen about 13psi.


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['01SilverBullet]

Hard telling. I'd guess something in the injection system, or the lighter oil causing less drag on the turbo's bearing shaft.

And 16 is about right. That's where the wastegate opens on mine. I know this b/c I can peg 16 psi at about 2700 rpm and it'll hold that up to wide open

[7.3HeavyHauler]

my gauge is taking the place of the AIH.