vex

I'm just wondering what the normal operating Oil Pressure is? Cruising at highway speeds particularly (65-70mph).

My gauge is reading nearly 8 all the time, just wondering if this is normal.

YearsOfDecay

should read around 60.... Unless you are running 20-50 oil, then it will go to 70 or so..

NOW.... if somebody put a High pressure Racing beat Oil Pressure unit in there.. it will read 80.....

Also.. Is this the stock gauge or an aftermarket.. the stock gauges are notorious for giving bad readings when they get old

vex

Stock gauge. And yes, I noticed this yesterday. My boost gauge doesn't work at all (I have a fuel cut controller installed, so this is the culprit according to my understanding - will an aftermarket gauge work correctly?)

Also, my speedometer is not reading correctly, which really sucks. But it's not the biggest deal.

Also, my oil pressure reading only reads 0, 4, and 8. not 60, 70, 80. I'm not sure of the units it measures by, but will check it out later today and post it up.

vex

It reads in BAR. What is normal in BAR?

Mindspin311

I have 20/50 in my TII and while on the highway I read a tad under 60

vex

So my oil pressure is between 87 and 116 psi? Is that possible, or is my gauge busted? If that is a true reading, what is going on?

buttsjim

My experience with the Mazdatrix fuel cut controlleris that the boost guage works, but reads lower than the true pressure. Unless your controller totally zeros out the signal to the ECU, it seems like you should see a reading.

vex

I get no reading from it.

buttsjim

Well I guess if you're curious, you could always unplug the fuel cut controller, and plug the harness back into the pressure sensor (I mean restore the original configuration), and see what happens. Don't mean to get you off topic, though--I know your immediate concern is with the oil pressure.

vex

Yeah, I'm most likely going to just install an aftermarket boost gauge this weekend, it's really the least of my worries (stock turbo on stock boost, don't REALLY need to be monitoring the boost that carefully).

vex

And for the record. I purchased the car in this state, yesterday. I'm in the process of getting everything fixed, I just want to understand the problems.

NZConvertible

It's calibrated in kg/cm2, it's written on the guage face. A full-scale reading probably means either the pressure sensor has short-circuited internally or the wire's fallen off it and the terminal has landed on something and grounded it. Check the sensor.

HAILERS

The guy above meant to tell you that you need to take a serious look at why you don't have a reading at the boost gauge. The wire that goes to the boost gauge is spliced off the wire that goes from the boost gauge to the ECU. Pin 2B on a series four. If the ECU does not see the output of the boost/pressure sensor, this could cause you serious engine problems.

See the free online fsm for the appropriate output to the ECU from the boost sensor with the key to ON and engine OFF. Pin 2B I think. See the free online fsm for the appropriate pin/socket.

buttsjim

Thank you Hailers--you put that very graciously. Now, I don't have to confess that I didn't know to tell him what you said. Relieved looking smiley face.

coldfire

iTrader: (1)

so your oil pressure gauge units is BAR?
hmm, i don't think my car has oil pressure in BAR...what FCs came with pressure in BAR instead of PSI?

well...if it IS in BAR, then there is nothing wrong with that reading, around 7 BAR is more than enough pressure...

- Aaron

vex

Canadian model. It could for all I know be normal, it just seemed odd to be operating so near the top end of the gauge.

coldfire

iTrader: (1)

well, i have a canadian model also
maybe i'm just being stupid, i'll go home tonight and check the units on the gauge, lol.

NZConvertible

Did you not read my post? The gauge is calibrated in kg/cm2. It's a Canadian model with metric instruments (like all non-US FC's).

Mint87RX7

what is bar?

slpin

iTrader: (9)

14.7psi

NZConvertible

Wrong.

1 atmosphere = 14.70 psi
1 bar = 14.51 psi
1 kg/cm2 = 14.22 psi

RylAssassin

I use an aftermarket gauge. I removed my factory sending unit and installed the aftermarket one in its place. Going by Ted's websight http://www.fc3spro.com/main.html under tech sectins then modifications then gauges ( youll see it ) It states that over 3k you should see around 70psi no more than 80 and under 3k like idle you shold see no less than 15psi
My car at idle is at 30psi, at 3k and over is about 71psi and at first start up is 80psi which if i remeber correctly is normal due some bypass valve in the eccentric shaft opening to get oil the the rotors as fast as possible.

coldfire

iTrader: (1)

i know Canadian models are kg/cm^2, i simply thought the original poster was mentioning the display in BAR.

Mindspin311

Ok so If my stock oil pressure guage never makes it over 60psi when on the highways, do I have a problem then?

NZConvertible

Yes, but it's probably a problem with the gauge, not the motor. My stock gauge used to read ~0.5kg/cm2 (~7psi) never got over ~4kg/cm2 (~57psi). I installed a new VDO mechanical oil preuusre gauge and now see 180kPa (26psi) at idle when warm and a peak of 450kPa (65psi).