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My oil pressure stays at 40 psi regardless of RPM.
My car is an s5 6 port turbo.
I have replaced the Front cover O-ring and pressure regulator
I am running 10 AN oil cooler lines
I have bypassed my oil cooler to test the issue and it still persists
I am testing oil pressure from a 180 psi gauge on my haltech
the gauge is located on an FFE Oil pedestal
My turbo is fed through the pedestal
my turbo drain is clogged slightly due to me having a bad gravity drain but I don't think that's the cause of the issue
My stock gauge reads higher than my Haltech gauge.
I'm having a lot of difficulties finding a solution to this problem. any help is greatly appreciated
You say the OEM gauge reads a bit higher than 40psi. Is it moving at all?
If both gauges are not moving from 40psi, it makes the likelihood of a failed gauge very low. So then it implies there is an actual problem with the pressure.
Since there are no external leaks, I would suspect the front cover o-ring has a small leak. It may be that it seals well enough to support 40psi but any additional pressure is enough to cause it to leak by the ring into the oil pan. It could hypothetically be the pump, but the only way to inspect it is to take it apart and inspect for wear. Otherwise maybe a failed regulator, but they're pretty sturdy so I would be very surprised if that was the case.
Hopefully someone else will chime in with some other possibilities before you have to remove the front-cover Good luck
I replaced my front cover o ring and regulator after i discovered the 40 psi issue
Sorry, I misread the original post. I thought you had replaced it before the issue, not after.
The other possibility is some sort of restriction. You know the oil cooler isn't doing it since you bypassed it. A -10 line is perfectly adequate, so that's not the issue. Oil filter clogged maybe? Although I believe they have a bypass valve inside to prevent starving the engine when they clog.
Did this issue present itself after you changed something in particular?
If you find that the OEM gauge moves even roughly correlated with RPM, then I would suspect something might be wrong with the Haltech sensor. Especially if the OEM gauge exceeds 40psi by a significant amount.
On my car it's wonky. Like I said, old gauge, and the condensor is long missing. Even so it still comes up with RPM more or less.
You replaced the oil pressure regulator.
Is it now a higher pressure regulator or one that came on engine.
What i found with high pressure MFR regulator on my S4 TII is the high oil pressure from the regulator would flex tje front cover away fro. The front side housing and the o-ring would slip out and end up in the front cover oil passage.
Resulting in low oil pressure as you have.
Some people punch the o-ring land to grip the o-ring for when the front cover is pushed away.
I added a dowel press fit into front housing between front cover and front side housing to contain the o-ring via o-ring inner diameter.
Front cover o-ring can be perfectly installed and still get pushed out of place if a higher pressure regulator is used is what I am attempting to convey.
Details including when this problem started, recent build? Was an unopened running s5 na without oil pressure issues, then just bolted on turbo components and started having components? Oil pump “known” to be healthy from prior use? Oil pump rotor in spec? Why issues with turbo drain?
05-08-22, 10:17 PM
My oil pressure stays at 40 psi regardless of RPM
Good luck
