RB25DE Oil Pressure Change...

[NA_R33]

hi all,

im new to the forum. I dont know neone else that owns a na skyline so i thought u guys could help. My oil pressure is always fluctuating. Do u guys notice this too? my dad says there could be a problem with the car. The presure rise under accelartion or whenever the revs go up and drops again at idle? is this normal, currently using castrol gtx3 fully synthetice oil. Any Help.

Cheers

John

[Pva_Glue]

umm.. well it's depends on the weather...hot cold..

pressure should not be too low but its also depends on the oil...

Not sure but it should not chage drastically as you say.

Try to use other oil at next service and see if its same

but its well known failure of oil pressure guage.

[nismoman18]

at idle it should be at 3 and at accelaration it should be at 4. if u have drastic pressure drops u have a leak sumwhere. so it should drop but only by one kg/cmsquare when its cold it usually goes right up to 6

[Demon Dave]

The RB engines are notorious for dodgy oil pressure guages - so it could be a false reading. (I had the same problem about a year ago - turned out to be faulty guage...)

But, it is better to check - make sure you have no oil leaks, and that the oil is of the correct grade.

In addition older, higher mileage engines tend to show lower pressure, particularly at idle. Generally it should be around 4gkcm when first started from cold, and drop to around 2 - 3 kgcm when idling and hot. Under acceleration it should rise along with engine RPM...

Hope it helps

Dave

[NA_R33]

thanks for that guys, yeah it does basically what u said it should do, i was just under the impression it should stay constant. thanks for ya help.

[Nismodified]

i actually noticed this as well recently

ive ALways used mobil full synthetic.

and it always stays at 4, on the dot

but theres some shell full synthetic in ther now, and on full acceleration its just a hair above 4, at idle its down to 3

[Guest RedLineGTR]

Watch the oil pressure when the car is hot – Keep in mind the oil pressure sender is prone to failure. These are the factory specifications for oil pressure on the RB20DET:

1kg/cm 2 @ 600 rpm

3kg/cm 2 @ 2000 rpm

4kg/cm 2 @ 6000 rpm

I know they are for a rb20 but they should be very close to the current standing add about 1 kg/cm on to the readings should be more accurate, similar readings on my line.

[alistern]

That seems close to what mine is.... I would be changing the oil if it reached 6kg/cm. When cold it sits just above 4kg/cm at around 1200 rpm, thats in my RB25DE.

[RTHRTY3]

Sorry to dig this up again. Recently I replaced by original dash dials with one of those Reverse Indiglo type El-Guage, and after doing do I noticed that the oil pressure goes right up there at cold start and goes up to 8 when accelerating. I think it didn't do it before the guage change and it hasn't been 5,000km after I made my last oil change. I'm using semi-synthetic oil. So can the installation process some how bugged the meter abit, is that possible?

And how can you tell what oil pressure ur getting without reading the gauge?

Cheers

[RTHRTY3]

Sorry to dig this up again. Recently I replaced by original dash dials with one of those Reverse Indiglo type El-Guage, and after doing do I noticed that the oil pressure goes right up there at cold start and goes up to 8 when accelerating. I think it didn't do it before the guage change and it hasn't been 5,000km after I made my last oil change. I'm using semi-synthetic oil. So can the installation process some how bugged the meter abit, is that possible?

And how can you tell what oil pressure ur getting without reading the gauge?

Cheers  

*BumP* Anyone?

[NA_R33]

dude ur best bet is to go get ur guages calibrated, cost me 50 bucks after i put my el guages in and i ended up wrecking my speedo its not hard to do.

[salival]

noticed in my r32 gts (rb20de) that at idle while warm it's sitting on about 1 (mobil 10w40 synthetic) and normally while driving it's around 4 +- 1 but depends on revs

[Sklyn]

Sorry to dig up an extremely old thread, but i am curious...

I have never noticed my oil pressure change before, in any car, has always been steady at half way.

Yesterday in my R33 gtst the gauge started moving with the revs. (as it seems it should be)

range from about 2.5 at idle to 5.5 when accelerating.

I'm a bit confused as I have not seen it move before, and now its working ok???

I have owned 5 cars previously and driven loads of others and not noticed oil pressure movement.

Over the weekend I had a run at the drags, so would/could this have flushed out a blockage and started things working better?

has been about 4000km since last service which was before i bought the car, so am planning one soonish.

I'm just stumped why i never noticed movement before, yet everywhere i read seems to say thats what should be happening..

[Got a Pulsar]

Sounds like you woke your car up from a Coma.

Much like this thread really.

[Sklyn]

yeah, but whats got me is the fact I never seen it move on any car ever!!

[Got a Pulsar]

My 33 is the only car I've had with an oil pressure gauge so I cannot compare there, but my gauge does what is described.

Higher pressure when cold than hot and increases with revs.