I know the reference oil pressure is approx 50 PSI at 3000 RPM

To those with Oil Pressure Gauges...what is the idle pressure...and what is the regulator max pressure?


Thanks

 

Mine sits around 120 to 150 kpa. Sometimes in Summer if its too hot and I havent change my oil, it drops down to 100 or 90 kpa

Max I've seen is about 520 kpa.

Picture below is my idle, I think I took it back in Sept.

 

Thanks......

 

nycgps dude,

you are in the usa.. it must be psi and deg f.. and be careful of doing to much at one time..

beers

 

but for some reason, I like Celsius and kpa more

I do one thing at a time, I always make sure its ok before I move on to the next one.

 

nycgps, is your car with 2 oil coolers? my oil pressure sits around 120 to 150kpa too.

 

My idle oil pressure usually rests around 25 PSI and reaches as high as 70 PSI under full load. I'm running Idemitsu 10w-30 oil as well.

 

°C and kPa FTW!

Whenever someone asks me how much boost I'm running and I tell them "between 62 and 85" the expression on their faces is priceless.

I didn't realize that the idle pressure was so low.

 

lol !

in Summer is even lower. but only if I havent change my oil in a long time tho (more than 3.5K miles)

it happened for a while I was like wtf ? then I was like AHHH, yeah .... changed the oil. never happen again.

 

a 40 wgt oil changes things a good bit.
oscd

 

Your oil pressure goes down with old oil? I assume this is with Royal Purple 5W30? If so, the reports of Royal Purple 5W30 shearing is true I guess.

Not a bit concern to me, but interesting nonetheless.

 

Shearing has nothing to do with pressure. Its a viscosity thing.
The additives to make an oil multi-vis go away as the oil gets older.

 

In order to make Multi-viscosity oil stable, they have to put a lot of chemicals. Lets not forget the oil itself has their own kind of chemicals.

and all these chemicals will degrade overtime, heat will speed the process even faster.

Changing your oil every 3K miles is always a good thing. and yes it was RP 5w30. Have you not seen my plugs thread? You should know which grade I use.

 

I'll check my idle pressure when I leave here today. I got a range from 14 psi - 80 psi while driving today.

 

Actually this is not exactly true.

Viscosity Index Improvers (VIIs) are the "additives" that work to maintain viscosity/thickness of the oil as it gets warmer to maintain the target viscosity at operating temp (20, 30 , etc.).

VIIs break down over time and do not perform as well - this process is called "shearing". As these VIIs breakdown, or shear, oil does thin out at it's operating temperature, so oil pressure will go down due to a worn out, thinner oil in which the VIIs are not working as well.

This is why viscosity at operating temp is measured as part of oil analysis - to compare to new oil and determine amount of shear during use.

Also, synthetics have a significant advantage over dino oils in this regard - they require much less, and sometimes no, VIIs to obtain the target oil viscosity range due to their better cold flow properties. Less VIIs means there is less to break down over time as base oil never looses its initial viscosity.

For all oils - small range oils, like 5W20, often require less VIIs and are less likely to shear than broad range oils, say 5W40, as they have/need less VIIs to create the target range.

 

you NEVER say Synthetic has any advantage ! Haters gonna come out and ban you from earth !

 

I get 18 Psi with 5w20 and around 22 psi with 10w40

 

here's a pic I JUST took as I pulled up to the house. 5w20
(excuse the crappy cell phone pic)

 

that is a great crappy cell phone photo..


beers

 

Those are some bad *** gauges what kind are they? They must have ran you a pretty penny

 

haha, thanks! Here's my thread on them: https://www.rx8club.com/series-i-interior-audio-electronics-24/diy-rb-gauge-pod-nordskog-digital-gauges-133938/

 

Nice gages.

 

Very nice. How much ? (with Borat's voice)

 

That might indicate an oil foaming issue... the oil pump is too busy collapsing bubbles then pumping oil

the basic background to that are oil air bubbles break when the oil surface tension is exceeded and a way to improve that is to put impurities in the oil to give the surface weakspots. The impurities or 'antifoamant' agents are usually silicone and float around in the oil (not in solution). The have been know to be filtered out by filters sometimes and synthetic oils have a harder time with foaming because the oil lacks impurities to begin with.

 

Thanks Jax! You certainly explained it better than I could.

On BITOG there is debate over the 5W30 weight Royal Purple as members have shown that it shears through wear. For those of us changing oil every 3,000 miles though, I don't think it's a big deal. However, because of the longevity concerns, I use Mobil 1 5W30 in all cars that I maintain except for my RX-8 since they're all on 7,500-10,000 mile drain intervals.

nycgps, don't forget you were using Shell synthetic in your sparkplug thread and had previously used Mobil 1. I wasn't sure which oil you were reporting.