MPG/Oil psi/ Spacer question
MPG/Oil psi/ Spacer question
I been thinking about this whole things alot. I have pretty decent amount of knowledge about the z but no so much in the motor area.
Might be a dumb question..but My question is , Is oil pressure related to the amount of MPG that you get? When i am sometimes trying to get good gas mileage and keep my foot off the pedal...i shift before the the oil psi reaches 60. Ive noticed when on the highway if you go above 60 psi the mpg tends to decrease. And this would be in 6th gear.
Next question is I just installed the plenum spacer, 5/16ths. At 65mph the oil pressure used to sit around 60psi. Now with the spacer on, at 60 psi its around 80mph. Does that make sense?
Ive noticed a increase in mpg with the spacer. before i would see 17/20 now 20/24. This is after testing a couple of tanks.
cliffs: So does the air space (plenum) affect the oil pressure ? and does it have anything to do with mpg?
thanks in advance
Might be a dumb question..but My question is , Is oil pressure related to the amount of MPG that you get? When i am sometimes trying to get good gas mileage and keep my foot off the pedal...i shift before the the oil psi reaches 60. Ive noticed when on the highway if you go above 60 psi the mpg tends to decrease. And this would be in 6th gear.
Next question is I just installed the plenum spacer, 5/16ths. At 65mph the oil pressure used to sit around 60psi. Now with the spacer on, at 60 psi its around 80mph. Does that make sense?
Ive noticed a increase in mpg with the spacer. before i would see 17/20 now 20/24. This is after testing a couple of tanks.
cliffs: So does the air space (plenum) affect the oil pressure ? and does it have anything to do with mpg?
thanks in advance
I usually kill MPG threads but this is an exception: MPG is related to a dozen factors, but primarily, engine RPM. 2,000 RPM is good. 6,000 RPM is bad.
Factors such as oil pressure are related to RPM. You could see a secondary correlation between MPG and oil pressure. But i would not tax my brain on the subject.
Factors such as oil pressure are related to RPM. You could see a secondary correlation between MPG and oil pressure. But i would not tax my brain on the subject.
Registered User
Joined: Sep 2009
Posts: 2,335
Likes: 5
From: Georgia
The Chevy Cruze and Volt use a special oil pump to save fuel:
"The oil pump in the engine of the 2011 Chevrolet Cruze takes a laid-back approach to its work, delivering the precise amount of oil needed during all driving conditions. That requires the engine to work less versus a conventional pump and ultimately saves fuel.
A standard feature in the Cruze’s Ecotec 1.4L turbocharged engine, the variable displacement oil pump reduces the displacement during engine warm up and high speed conditions. The volume of oil from the pump varies with rpm by changing the pump’s displacement through a pivoting control chamber mechanism and sliding vanes. A fixed displacement pump would typically bypass the extra oil internally.
“By lowering the volume of oil we reduce the amount of energy, or torque, required to pump the oil, without taking necessary lubrication away from the engine,” said Mike Katerberg, assistant chief engineer for the 1.4L. “Reducing the torque demand reduces fuel consumption. It’s a simple, durable, maintenance-free design that we have used in our transmissions for years and more recently in our hybrid vehicles.”
"The oil pump in the engine of the 2011 Chevrolet Cruze takes a laid-back approach to its work, delivering the precise amount of oil needed during all driving conditions. That requires the engine to work less versus a conventional pump and ultimately saves fuel.
A standard feature in the Cruze’s Ecotec 1.4L turbocharged engine, the variable displacement oil pump reduces the displacement during engine warm up and high speed conditions. The volume of oil from the pump varies with rpm by changing the pump’s displacement through a pivoting control chamber mechanism and sliding vanes. A fixed displacement pump would typically bypass the extra oil internally.
“By lowering the volume of oil we reduce the amount of energy, or torque, required to pump the oil, without taking necessary lubrication away from the engine,” said Mike Katerberg, assistant chief engineer for the 1.4L. “Reducing the torque demand reduces fuel consumption. It’s a simple, durable, maintenance-free design that we have used in our transmissions for years and more recently in our hybrid vehicles.”
I usually kill MPG threads but this is an exception: MPG is related to a dozen factors, but primarily, engine RPM. 2,000 RPM is good. 6,000 RPM is bad.
Factors such as oil pressure are related to RPM. You could see a secondary correlation between MPG and oil pressure. But i would not tax my brain on the subject.
Factors such as oil pressure are related to RPM. You could see a secondary correlation between MPG and oil pressure. But i would not tax my brain on the subject.
i understand the first part now, thats kind of what i was thinking.. question remains does our plenum (amount of air space )affect the oil pressure
The Chevy Cruze and Volt use a special oil pump to save fuel:
"The oil pump in the engine of the 2011 Chevrolet Cruze takes a laid-back approach to its work, delivering the precise amount of oil needed during all driving conditions. That requires the engine to work less versus a conventional pump and ultimately saves fuel.
A standard feature in the Cruze’s Ecotec 1.4L turbocharged engine, the variable displacement oil pump reduces the displacement during engine warm up and high speed conditions. The volume of oil from the pump varies with rpm by changing the pump’s displacement through a pivoting control chamber mechanism and sliding vanes. A fixed displacement pump would typically bypass the extra oil internally.
“By lowering the volume of oil we reduce the amount of energy, or torque, required to pump the oil, without taking necessary lubrication away from the engine,” said Mike Katerberg, assistant chief engineer for the 1.4L. “Reducing the torque demand reduces fuel consumption. It’s a simple, durable, maintenance-free design that we have used in our transmissions for years and more recently in our hybrid vehicles.”
"The oil pump in the engine of the 2011 Chevrolet Cruze takes a laid-back approach to its work, delivering the precise amount of oil needed during all driving conditions. That requires the engine to work less versus a conventional pump and ultimately saves fuel.
A standard feature in the Cruze’s Ecotec 1.4L turbocharged engine, the variable displacement oil pump reduces the displacement during engine warm up and high speed conditions. The volume of oil from the pump varies with rpm by changing the pump’s displacement through a pivoting control chamber mechanism and sliding vanes. A fixed displacement pump would typically bypass the extra oil internally.
“By lowering the volume of oil we reduce the amount of energy, or torque, required to pump the oil, without taking necessary lubrication away from the engine,” said Mike Katerberg, assistant chief engineer for the 1.4L. “Reducing the torque demand reduces fuel consumption. It’s a simple, durable, maintenance-free design that we have used in our transmissions for years and more recently in our hybrid vehicles.”
Registered User
Joined: Sep 2009
Posts: 2,335
Likes: 5
From: Georgia
No, the 350Z has fixed positive displacement pump. The output volume is determined by engine speed, and the system pressure is determined by oil viscosity and the flow through the various bearings. There's a pressure regulator valve, but I can't find any info about how it's set. I suspect it's set higher than 110psi.
Temp alters oil pressure, so for testing you would need days that have the same temp and same condition of oil. Milage in dependent on conditions and throttle input, just adding a 3 or 4 stops in a trip can alter milage really quick.
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^ i understand all that. either im not reading/understanding what is written ...but my confusion now is .. Does the plenum volume have anything to do with oil pressure? I understand temp and days and all that effect it..but reason I ask is because, after i put in plenum spacer, the oil psi dropped at certain mph's that i usually monitor
^ i understand all that. either im not reading/understanding what is written ...but my confusion now is .. Does the plenum volume have anything to do with oil pressure? I understand temp and days and all that effect it..but reason I ask is because, after i put in plenum spacer, the oil psi dropped at certain mph's that i usually monitor
i see, im not concerned about anything just trying to learn, for example
before spacer Going 60 mph oil sat @ 60psi
After spacer Going 80 mph oil sat @ 60psi
Im thinking air space does affect it.. im thinking if i went with a bigger spacer, the mph would drop more when @ 60 psi.
before spacer Going 60 mph oil sat @ 60psi
After spacer Going 80 mph oil sat @ 60psi
Im thinking air space does affect it.. im thinking if i went with a bigger spacer, the mph would drop more when @ 60 psi.
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