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Shimming Factory Oil Pump Relief Valve

r33_racer

By r33_racer,
in Engines & Forced Induction

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The Dan Grand Master

The Dan

Posted
Posted
Im curious if anyone has done this when using their std oil pump and if so, do you know roughly what thickness shim will net what oil pressure increase?

Cheers.

I normally use a M6 spring washer that I straighten. I think they are about 2mm thick and it get's you roughly 10-15psi on cold start and in the top end when hot but doesn't seem to make much of a difference at idle when hot though. If anything it might be 2-5psi idle/hot

irishGTSr32 Apprentice

irishGTSr32

Posted
Posted
I normally use a M6 spring washer that I straighten. I think they are about 2mm thick and it get's you roughly 10-15psi on cold start and in the top end when hot but doesn't seem to make much of a difference at idle when hot though. If anything it might be 2-5psi idle/hot

this the done thing? any probs wth doing it?

The Dan Grand Master

The Dan

Posted
Posted
just didnt know if it was a done thing for all the pumps, i have a 26 pump on my 20, would it still be any better with more

pressure on the valve?

Unless your motor is out of the car, there would be no point doing all that work for such a little gain. I only do it as a small aid due to the fact the 20 year old pump can do with a bit more oomph. The oil pressure increase is not really going to do too much for you.

Also, there is no difference between a 26 pump and a 20 pump unless it's an N1.

SECURITY Grand Master

SECURITY

Posted
Posted (edited)

they do this to rb30 oil pumps. its a common "fix" for the lower oil pressures the RB30E pumps produce at higher RPM when putting a DOHC head on an rb30 compared to DET pumps (for getting away with using a RB30E pump rather than buying a DET pump)

Edited by SECURITY

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