Oil Pressure And Idle Speed

[Trozzle]

When I started my car late this evening (warm, only off for about 1 minute after having driven), I immediately noticed it appeared to be idling low...couldn't remember the standard ECU idle speed off the top of my head (pretty sure it was 750rpm), but it was sitting around the 550 - 600 mark on the tacho. Also noticed the oil pressure was the lowest I've seen it while the engine is running: it was below the unmarked line between 4 and 0. If I held it at 2000rpm, it would rise to that line, which I assume would be 2?

Knowing my luck, it's nothing/I won't be able to replicate it in the morning, but just curious as to anyone elses opinion on whether this indicates a problem or not.

Thanks once more guys

[a20089]

low oil possibly, high oil does the opposite for the oil pressure

[Trozzle]

haha yeah I thought it may be the case, but from the very rough reading I could get in the poorly lit carpark, it seemed fine. The oil was last changed just under 2000kms ago, it's not blowing smoke, and the 2 oil leaks it currently has are negligible in this case.

Will go outside and have a look at the level now that it's light....on that note, when the engine is cold and hasn't been running, where should the oil level be? On the VL, it would be sitting halfway covering the "H" for high on the dipstick, though I don't know the sump size etc for the rb25 as compared to the rb30.

[JD_R33]

It's because you bought the wrong car!

It should at least to the max line when hot or cold, allowing time for it to sit and all the oil to drain back into the sump.

[tridentt150v]

I wouldn't worry about it, wait and see if it comes back up later. Don't flog the motor though.

I have greddy oil press gauge and at idle it does 1.5/2, at say 80km/h it does around 3.2 and at 100 it does 3.8. If you go above 3,500-4000rpm it will rocket up to 5.0kg/cm2.

When the car is cold and you start it up, the oil pressure will peak out at 6-7 and then slowly drop as the oil warms up.

I had my std oil pressure gauge sit on <1.0 for about 30km only the other day, the greddy was reading fine/normal. The std gauge corrected its little hick up and read OK after a while.

If you really want to know your oilpressure strap on an aftermarket gauge......its the only way.

[hr32gts]

Should start out when cold around 4 bar and drop down to 2 bar when at operating temp

4 bar = 58.015 psi COLD engine

2 bar = 29.007 psi at operating temp

well thats the readings for the GTS but the GTS-T may be different with the turbo I am not entirely sure