3.5L PowerBoost Max oil Pressure

[Gros Ventre]

Does anyone know the rated maximum engine oil pressure? I had installed a 0-100 psi electric gauge and the sensor failed with a small oil leak. I infer that the max pressure is greater than 100#. Anyone know?

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[nikon858]

I’ve watched it on Obd fusion. Never seen it higher than 70

 

[Gros Ventre]

Well, my 0-100 psi gauge has failed and is leaking oil out the wire point. I was observing 98 psi. My inference is that something greater than 100 psi occurs routinely. Anyone else? Anyone got a look at the shop manual spec?

 

[22Platinum]

I believe its a two stage pump with 95# being the default and when told to, the pump reduces the pressure to 40#

 

[Gros Ventre]

I believe its a two stage pump with 95# being the default and when told to, the pump reduces the pressure to 40#

yep, saw that. Actually observed 48# low & 98# high setting. Still, the sensor failed and was leaking oil. So curious as to potential higher numbers. Oddly the numbers start out a bit lower cold and go up a bit when hot. (like 45# & 95# cold).

 

[PB2021]

I’ve only ever seen up to 93psi through OBD reader. Even if the gauge is rated 100 and the pressure was slightly higher I doubt that would cause a leak. Likely just a bad gauge off the shelf

 

[Gros Ventre]

That's about where I'm coming to... was hoping that would be the answer. Warranteed item on the way...

I’ve only ever seen up to 93psi through OBD reader. Even if the gauge is rated 100 and the pressure was slightly higher I doubt that would cause a leak. Likely just a bad gauge off the shelf

 

[McGuyver]

Keep in mind the PID y’all are pulling on the OBD for oil pressure is PSIA, not PSIG. I say that because mine would show 14.6 or 14.7 when the engine is not running. I created a user defined one where 14.7 is subtracted. I typically see 45 psig for the “high pressure“ and 25 psig when the pump is low pressure. Seems low but I figure Ford is minimizing HP loss to maximize fuel economy. Hopefully not at the expense of longevity.

 

[fordtruckman2003]

Keep in mind the PID y’all are pulling on the OBD for oil pressure is PSIA, not PSIG. I say that because mine would show 14.6 or 14.7 when the engine is not running. I created a user defined one where 14.7 is subtracted. I typically see 45 psig for the “high pressure“ and 25 psig when the pump is low pressure. Seems low but I figure Ford is minimizing HP loss to maximize fuel economy. Hopefully not at the expense of longevity.

Subtract the barometric pressure PID for more nerd points. ?
Covered that in the oil pressure PID thread.

Comparing against a physical gauge as they are using you want the full pressure reading though.

 

[Gros Ventre]

In my case the instrument is independent of the truck so it is reading gauge pressure (PSIG).

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