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Z22Se High Oil Pressure

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#1 aquilaproejct



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Posted 20 February 2019 - 09:10 AM

Hey guys,

I've asked Vocky about this, but wanted to see if anyone else has similar experience.

I am seeing very high oil pressures (over 140psi where gauge maxes out) above 5,000rpm until my car has fully warmed up after 15+ minutes of gentle driving.

After full warm up, the max I see is around 120 psi which is normal.

I suspected my electronic gauge as dubious, but a mechanical gauge reads the same.

Readings are taken from the standard oil cooler takeoff pipe.

I removed the diverter to the cooler. Same result.

I replaced the pressure relief piston and spring. Same result.

The oil I am using is a full synthetic 5w40.

I suspect I may have had a new pump just prior to my ownership as the relief valve nut was not to torque, the spring looked very new and shinny, plus the crank seal was not OEM.

Anyone else see slow warm up and high pressures up to warm up?

It seems nearly to be an oil factor, as once warm the bypass orifices appear to be able to relieve okay..

Is there any after market high pressure pumps?

#2 Arno


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Posted 20 February 2019 - 10:47 AM

Z22SE runs very high pressure as standard.


See: https://www.speedste...sure, Check.pdf


Oil pressure at idle on a warm engine should be between 58 and 81psi.


Cold oil pressure at 3000rpm can easily reach 9+ bar (130 psi) on a fresh engine so yours sounds pretty normal and healthy when revving higher on cold oil.


No really seeing an issue other than you needing a gauge and sensor that maxes at 15 bar if you don't want to see it pegged at the max B)


(or treat it like a warning that the oil is too cold to rev it so high...)


Bye, Arno.

#3 Nev


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Posted 21 February 2019 - 07:13 AM

Use a thinner oil perhaps.

#4 aquilaproejct



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Posted 21 February 2019 - 07:45 AM

Hey Arno,

Interesting that fresh engines can be so high.

Given that there appears to be nothing wrong with my engine, I am surprised that everybody is not seeing the same behaviour. But nobody else is reporting this?????

The warm up is soo very slow, and probably a function of the cooler. it would have to be the slowest warm up modern car I have driven.....including diesels! Surprised by it doesn't have a thermostat to bypass the cooler, like auto transmission run.

Also odd that when cold the engine isn't designed to release the pressure at 125psi.


I thought 5w40 was pretty thin for cold start.. I live in Australia, so my cold starts are normally at around 15 degrees minimum.. not UK cold.

#5 vocky


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Posted 21 February 2019 - 09:44 AM

not many owners have oil gauges and many of those that do have the B207 engine block which has under piston oil jets, these lower the oil pressure and thus they don't see high figures

#6 aquilaproejct



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Posted 25 February 2019 - 08:02 AM

Just to close this out.
Found the following for z22se.

Cold normal start up pressures with coolant temp at 27degrees Celcius at 5,000rpm can exceed 10 Bar.
At 87 degree coolant temp at 5000 rpm the engine is at 8 bar....

Conclusion is my engine is normal

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