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Hey

When driving my oil presure gauge sometimes drops all the way down to sitting just about the 0. When i start the car it goes up to 4 but when i drive it mainly sits on the line below the 4. Any ideas why it would be doing this ? Car hasent lost any power. Car is a R32 GTR

Thanks

Edited by BNR
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https://www.sau.com.au/forums/topic/85663-oil-presure-question/
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It may be the sender.

Mine does this 'occasionally', the little ol rb20 did this as does the rb30. My sender is dicky and appears to play up 'occasionally' when it gets hot. Completely random, then all of a sudden its ok again.

It may be the oil your running?

My oil pressure when cold is well over the 8. Idle is inbetween the first and second line. Cruise is some where above 4 and above 3500-4000rpm is up around 7. :)

I'm using an rb25det pump.

  • 7 months later...

if the sender is stuffed, does that mean if u put an aftermarket guage on you will still see the same results as the stock guage ??....

just out of interest.. where abouts is the sender... or how would u go about hooking up and aftermarket one :) ?

Even the R34 sender is crappy. It's the one thing Nissan didn't seem to figure out.
if the sender is stuffed, does that mean if u put an aftermarket guage on you will still see the same results as the stock guage ??....

just out of interest.. where abouts is the sender... or how would u go about hooking up and aftermarket one :) ?

the sender is screwed into the block about 1.5 inches the rear of the engine from the oil filter.

you would replace or use a T piece to screw in both senders. ( i have a thing about dash guages still working even though i have aftermarket)

in the pic below the sender is screwed in where the line going from bottom left to top right of the block is.

post-5157-1144400972.jpg

Edited by Craved
cool thanks heaps for that :)

if the sender is broken though.. wouldnt it send incorrect results to the aftermarket guage still ???

aftermarket guages come with their own sender ... thats why you use a T piece so they are both hooked up and working (even if stock one is wrong)

yeah, i would say the sendor unit a swell. mine is sitting just above 0 as well when it idles hot. then pulled the sendor unit apart, it was actually leaking oil through it. then put on a mechanical oil pressure gauge, and the reading is on 2.5 bar hot idling, which is fine.

apparently according to Nissan, when the rpm is at 950, the oil pressure should be on 1.5 bar hot, which proved mine was fine.

  • 8 months later...

somthing to chew on

when you fill your engine up with oil and you fill it to the top of the full line on the dip stick the oil presure should be 3.9-4.0 cold 1.9-2.5 warm.

but if you fill the engine to 2mm below the full mark on the dip stick the oil presure cold is 6.8-8.0 and 2.5- 4.0 warm the big question is what is better for the engine.

does it work like this lower presure lower oil flow warmer engine? or higher oil presure higher flow warmer engine?

i am lost at what to do i will leave it to the brains trust

SK will probably know what to do

The oil when under pressure creates a very thin film of oil between the two surfaces keeping them (in a way) insulated from each other.

Thats what i think is called pressure lubrication where as in say a gearbox they utilise a splash lubrication.

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