Bad Oil Pressure I Think?

[t51rb26]

hey guys im a noob just got a rb26 swap done in a s14.here is my problem today wen i was driving back home from work i noticed my oil warning light was coming on and off and flicking while driving normal. so got home and installed a oil press gauge to see what oil press i had because the one on my cluster dosent work do to not wiring it i have the r33 cluster. so i installed the gauge and went for a drive so while driving and looking a the gauge full throttle goes from 40psi to 80-90psi then all the way back to like 40-20psi while at full throttle.at idle is at 20-30psi im gething all kinds of psi readings pls help. thanks for ur help you guys

[Cubes]

If the aftermarket guage is reading similar to the std guage then its safe to say the motor has problems.

[t51rb26]

If the aftermarket guage is reading similar to the std guage then its safe to say the motor has problems.

problems like what? the only gauge i have to read the oil press is the aftermarket one i installed.

[Cubes]

Bottom end problems.

Get another gauge on it to be sure.

[Beer Baron]

sounds ok to me. a little bit low but nothing to worry about.

basically it should be around 30psi at idle. above 3000rpm (regardless of throttle position) it should be 60psi+.

[Cubes]

Whats with this though?

full throttle goes from 40psi to 80-90psi then all the way back to like 40-20psi while at full throttle

Oil pressure vary's considerably while giving it a full rev. 40-20psi can't be too good at the upper rpm's. :S

[Beer Baron]

yeah if that is actually what's happening it's not good for sure. but to be honest the whole sentence didn't make all that much sense.

[t51rb26]

sounds ok to me. a little bit low but nothing to worry about.

basically it should be around 30psi at idle. above 3000rpm (regardless of throttle position) it should be 60psi+.

kool but wen i do full throttle from 5krpm to 8krpm it goes from 40-psi to 80+psi then befor it gets to 8krpm it goes back down to like 20psi crazy shit. keep in mind that this happens while at full throttle.

[stolen_s15]

As Cubes says, get another guage and see if the guage is the problem. If so it's a cheap fix, just get a new guage.

[Godzilla32]

Wouldnt you wanna check the sender is actually giving the correct signal too??

[Yawn]

My car was burning a lot of oil a while back before the motor KO-ed. When the oil levels were low, the oil pressure would go haywire, something like what you described.

[t51rb26]

As Cubes says, get another guage and see if the guage is the problem. If so it's a cheap fix, just get a new guage.

ok got a new guage and still dose the samething while driving normal it gives me normal psi numbers but wen i do fullthrolle psi goses up and down up down why?

[Yawn]

Oil slushing around in the sump?

Maybe try overfilling the oil by a litre or so.

[Beer Baron]

yeah check your oil level asap.

[Godzilla32]

Check oil level for sure, but i still want to know if you have actually checked the sender??

[t51rb26]

Check oil level for sure, but i still want to know if you have actually checked the sender??

were is the sender located ?

[Cubes]

If you have tried another gauge you would have plumbed in another sensor??

[t51rb26]

yeah check your oil level asap.

oil level is right on the line wen i do oil change i put 4/5 quarts i have the rb25 oil pan is this good or not im making 454whp on gt2530's.im thinking that i might be runing out of oil at high rpm.maybe it dosent come down fast enough for the pump to create pressure again. ?

[t51rb26]

If you have tried another gauge you would have plumbed in another sensor??

[/quote

i do have one but its not wired up to the r33 rb25 cluster dont know how to do it . so i just have the gauge.

[Godzilla32]

Im not as familiar with the 25 as i am with the 26. On the 26 it has a sender mounted under where your oil filter is. They very commonly read inaccurately on the 26's, so im hoping for your sake its the same deal on your engine.

You need to get a master guage which will screw into where your oil pressure switch normally goes. Thats the safest way to check your oil pressure and know exactly what its reading. If you dont have one, take it to a garage and ask them to check it for you.

Good luck mate

Deren