As far as I can tell it's the only pressure valve for the oil pump.

Will it cause any problems having overly high oil pressure?

Anyone make know of any external aftermarket releif valves?

Problems I saw with tapping back of pump- engine mounting is a bit close, and p/s mounting(depending on what you use)

So to answer your question, pressure works in two ways; pressure to the engine and back-pressure towards the oil-pump. If you take the pressure relief valve out while it *may* not damage anything on your engine, the excessive back-pressure on the oil-pump will most likely damage the seals in the pump.

I haven't seen any external units, but someone may make one in the racing space. I looked through summit and didn't see anything. Good luck with your mod.

Thanks,
Nick.

The PS pump is gone, it was rooted anyway and I will be using a MR2 pump. No air con, no PS pump only the alternator to get in the way of turbo pipes

Thanks,
Nick.

No definitive answer, but sounds like something that should be kept. I'll have a think and a tinker and see what I can dig up at work to rig up. Might be able to use a pilot valve off a water pressure relief valve

I was going to take the housing away completely, but the valve is important enough to me to keep.

So did you keep the relief valve? Not entirely clear from your description.

You ever notice when your engine is at idle the oil pressure is low, then when it hits X RPM it's at ~90psi, but never goes over that? That's the relief valve doing it's job.

On DSMs where the balance shafts have been removed and the bearing oil ports plugged, there have been reports of oil pressure jumping to 90psi off idle, holding there til 7krpm, then starting to climb again above there, because there relief valve can't flow enough. The remedy was to port the opening.

Bottom line is, the relief valve is important, it is possible to overoil an engine.

Thanks Steve, that was the sort of answer I was after

Yeah that's right. I still have factory relief valve. I've attached a couple of photo's but they aren't very clear as there is no way to get a camera in the right position!

From below

from the side

In front and to the side

In front.

The filter is sitting in front of the motor at about a 45* angle with the top closer to the outside of the motor. (if that makes sense?)

Hope that makes it a bit clearer.

You were not kidding about short hose. Interesting solution. Funcionality berofe looks,

My photo's always suck The oil is clean and there is no sludge in there, just looks that way. Need to take then in the sunlight

Yeah a pure race vehicle so it is all about working well and being as easy as possible to work on.
As for looks, most people just look at the motor and turbo and after they comprehend that, they don't give a **** that it doesn't have any bling!
There's a few guy's I race that have fitted SC to there Lexus V8's but they are still long long way behind!

Turns out, as overengineered as the VH is, there are two valves which serve two different purposes. There is an oil regulator valve, which is inside the pump. I believe this valve serves the function which I described above. It regulates the engine oil pressure.

The valve in the filter housing is an oil relief valve which, as best as I can tell, bypasses the filter. I would assume this is for situations where the filter becomes clogged and the pressure from the pump needs to get to the engine, it provides an alternate route.

Most engines have a certain amount of bypass built into their filter housing designs, but it is often unregulated. On the VH it is regulated.

So on the original question, whether it is ok to remove this valve or not. I would still say you need it, it just serves a different purpose than I originally thought.