Hey all. Just recently build my engine but having some concerns about hi oil pressure. On idle the pressure is around 24psi but as soon as I give a little rev it jumps up between 90>100+psi. I'm running motul 5w40 on 107 octane fuel. Should I be worried about this pressure??
This is the engine modifications I have done:

Engine made 430hp:
JE Piston 10:1 - 85.5mm
Nitto I-Beam Conrods
Tomei Adjustable Cam Gears
Tomei Pon-Cam 260
GSC Beehive Springs
GSC Titanium Retainers
Extrude And Honed Exhaust Manifold
Milspec Throttle Body Shaft Seals
Kiggly HLA Pressure Regulator
ACL Race Main Bearings
ACL Conrod Bearings
ACL Thrustwasher Set
ARP Main Stud
ARP Head Stud L19
Topline Lifters
OEM Engine Gasket Kit
Supertech Exhaust Valves
Supertech Intake Valves
AEM High Flow Fuel Fail
AEM Fuel Pressure Regulator
Black Ops 1400cc Injectors
DW300 Fuel Pump
Tomei Slicing Baffle Plate
AT Performance Oil Catch Can
AMS Balance Shaft Eliminator Kit
GTPumps 712
Turbosmart Actuator 22psi
GTPumps Fitting Kit
GTPumps Oil Lines
Plazmaman Silicon Intake
Turbo Smart Blow Off Valve
Injector Resistor
JMF Battery Tray
Mishimoto Race Aluminium Radiator
ETS Full Intercooler Kit Short Route
Invidia 3" Turbo Back Exhaust
Tomiko High Flow Cat

 

Is that hot or cold?

 

Hot engine at idle is 25psi and driving around normally can go between 50>100+

 

What's the oil pressure when cold, at 60 celcius and at max oil temp? Kiggly HLA helps the oil pressure stay a bit higher. Remove and put the stock plate back to see if there is some drop in pressure.

Is the balance shaft system still on the car?

What grade/viscosity/type of oil are you using?



Your rotating assembly bearings(mains) maybe of too tight toleralnce.







Marios

 

Sorry did you mean psi instead of celcius? But yes the oil is at correct temp. The pressure never got up that high when I first got the car, it was only until the day after a track day was when it was showing 100+psi.. So i don't think it's the HLA. I removed the balance shaft kit with a AMS delete kit. I'm using Motul 5w40 full synthetic oil. It could be the bearings but it shouldn't be because it never was at that high pressure to begin with.

I removed the oil pressure relief valve and polished the piston just incase it was getting stuck but that wasn't the issue. So far I have eliminated that the oil pressure gauge is not faulty, no lines are bent, I put a new oil filter and polished the relief valve. Next I'll be trying a softer relief valve spring.

What else could it be?

 

No I meant the oil pressure when cold, when oil is at 60 celcius and when at max operating temp.


Remove the HLA and do the softer spring install and let me know if the pressure drops.


Also are you using stock oil pan setup?






Marios

 

Yeah I'll do the swap tomorrow and see how that goes. I'm using a tomei baffle plate with a stock sump

 

Hopefully pressure will drop a bit, did you notice any fuel at all in the oil?







Marios

 

Na there was nothing in the oil

 

100 psi oil pressure isn't really that high, generally speaking. What's more of a concern is that it's higher than before. In this case, The most likely cause is your crankcase pressure's higher when you rev it compared to when the motor was still freshly built. Unfortunately, this is probably a piston ring sealing issue.

Easiest way to check would be to rev it with the oil dipstick and filler cap removed, and see if it made any difference in your oil pressure.

 

That's exactly why I am concerned because it never was that way. I'll be sure to give it a rev with those two removed. Could it also be due to a spun bearing?

 

Are suggesting that blowby is raising oil pressure?

 

If it is higher after a track day, still is higher and you haven't changed oil, then I suggest you cooked the oil a little raising the viscosity.

 

So I removed the oil cap and dipstick and gave it a rev, the psi didn't change as before 😞

I got another spring from the pressure relief valve and took of one coil and it seemed to drop the psi abit. Hopefully this is a issue that will not come back again.

If anyone has any more suggestions or had something similar happen and fixed the issue please let me know

 

You can go to the dealer and purchase a spare oil pressure relief spring and they are only a few $'s. Start by taking off ~0.065" to see how much your pressure drops. The relief spring won't have a significant effect on idle pressure, but will for WOT. I had the same issue and ended up taking off between 0.065" - 0.100" to target a WOT pressure of ~85-90psi.