Oil pressure

ZoomZ · 05-21-2020, 11:54 AM

Quote:

Originally Posted by JARblue

I've got some questions. They may or may not be dumb; I certainly am.

What does it matter if the gauge doesn't go above 100? The oil pressure only reads over 100 on startup, right? So if the gauge maxes out on startup then why does it matter if you can read the extra 20 psi or not?

I mean if it damages the gauge or something that makes sense, but I've never heard of that. I got my gauge to make sure my oil pressure doesn't drop too low. What would be the need to check oil pressure when it maxes out?

To make sure your oil pressure bypass is working. You want to see the high end and see it actually drop after warmed up. I'd like to know pump is attaining high pressure and bypass is working.

Dentt42 · 05-21-2020, 01:15 PM

Quote:

Originally Posted by ZoomZ

To make sure your oil pressure bypass is working. You want to see the high end and see it actually drop after warmed up. I'd like to know pump is attaining high pressure and bypass is working.

I learned something today. I always wondered why oil PSI gauges that read over 100 even exist.

Rusty · 05-21-2020, 03:42 PM

Any gauge that gets pegged on a regular basis will fail sooner then later. Gauges do not like being pegged. You damage the internals and the sensor. A digital would be a bit better at being pegged.

Dentt42 · 05-22-2020, 07:56 AM

Quote:

Originally Posted by Rusty

Any gauge that gets pegged on a regular basis will fail sooner then later. Gauges do not like being pegged. You damage the internals and the sensor. A digital would be a bit better at being pegged.

I'd say if it gets pegged on a regular basis, it would possibly get to like it and have a lesser chance of damaged internals. It does make sense that some are better at the pegging though.

There was no way I could just leave that there.

SonicVQ · 05-23-2020, 09:32 PM

Quote:

Originally Posted by Dentt42

I learned something today. I always wondered why oil PSI gauges that read over 100 even exist.

The 100 PSI gauges are perfect for the older v8 that make about 10 psi per 1,000 RPM.

The VQ37 does have high oil pressure in comparison.

Corsairprime · 06-02-2020, 01:20 PM

Z folks, Here's what I used for oil pressure sensing.

URL: https://www.autometer.com/2-1-16-oil-press-0-120-psi-bfb-spek.html[/URL]

Description from the Autometer website:
2-1/16" OIL PRESSURE, 0-120 PSI, STEPPER MOTOR, SPEK-PRO, BLACK DIAL, BLACK BEZEL, FLAT ANTIGLARE LENS
Product # P325328

I regularly get 115 PSI at start-up when driving, within the first 5-6 minutes at 60-70 MPH. Drops to 85-90 PSI soon after that. Food for thought.

MotorvateDIY · 06-02-2020, 03:09 PM

Here is some oil pressure data from a recent test.

The graph below shows the engine RPM, oil pressure and oil temperature when we did some acceleration tests (wide open throttle) in second gear to the top of 3rd gear on a closed course we rented.

What I find interesting is that with the engine oil temp at 103C / 217F at 6,000 RPM there is 104 PSI of oil pressure.

Test results from 2011 G37 Sport Sedan (6MT) with 105,000 miles.

ByThaBay · 06-02-2020, 04:37 PM

Quote:

Originally Posted by MotorvateDIY

Here is some oil pressure data from a recent test.

The graph below shows the engine RPM, oil pressure and oil temperature when we did some acceleration tests (wide open throttle) in second gear to the top of 3rd gear on a closed course we rented.

What I find interesting is that with the engine oil temp at 103C / 217F at 6,000 RPM there is 104 PSI of oil pressure.

Test results from 2011 G37 Sport Sedan (6MT) with 105,000 miles.

I sent you a few FB messages - are you around??

MotorvateDIY · 06-02-2020, 06:36 PM

Quote:

Originally Posted by ByThaBay

I sent you a few FB messages - are you around??

Yup... check your PMs

05-21-2020, 03:42 PM	#3 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 69 Posts: 35,489 Drives: 2011 Nismo GM 6M Rep Power: 2684438	Any gauge that gets pegged on a regular basis will fail sooner then later. Gauges do not like being pegged. You damage the internals and the sensor. A digital would be a bit better at being pegged. JARblue and ZoomZ like this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

06-02-2020, 01:20 PM	#6 (permalink)
Corsairprime Base Member Join Date: May 2014 Location: Frisco, TX Posts: 215 Drives: 14 370Z Nismo GM 6MT Rep Power: 3546	120 PSI Spek-Pro Oil Pressure Gauge Z folks, Here's what I used for oil pressure sensing. URL: https://www.autometer.com/2-1-16-oil-press-0-120-psi-bfb-spek.html[/URL] Description from the Autometer website: 2-1/16" OIL PRESSURE, 0-120 PSI, STEPPER MOTOR, SPEK-PRO, BLACK DIAL, BLACK BEZEL, FLAT ANTIGLARE LENS Product # P325328 I regularly get 115 PSI at start-up when driving, within the first 5-6 minutes at 60-70 MPH. Drops to 85-90 PSI soon after that. Food for thought. __________________ Corsairprime 2014 Nismo #462, GunMetal Grey, GT-R Start Button, AAM S-Line/R-Line intake and S-Line exhaust, Berk HFCs, Osiris Tuned at JoTech

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