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GT3 Oil Pump/ Oil Pressure Release

Old 05-16-2018, 11:02 AM
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Gus
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Default GT3 Oil Pump/ Oil Pressure Release

For those of you have that have added a GT3 Oil Pump Mod to their engine.
Did you make any modification to the oil pressure release valve either by removing washers or reducing spring length. This would allow the oil pressure to come back into normal operating range. If you did what or how did you make this modification and what is you current oil pressure?
I have not made the reduction and my oil pressure appears to be excessively high, running above 4 bars on start then settling at about 3 bar at idle after warm up and 5 bar on any throttle input taking engine above 2K.
Normal idle oil pressure (warm) should be a little above 1 bar (?) and at higher RPM plus 4 bar? -
If you have made modifications to yoiu oil pressure relief valve what did you do?
Thanks
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Old 05-16-2018, 12:31 PM
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Spyerx
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FWIW, my GT3, cold start is 4bar, settles to about 1 bar at idle once fully warmed, and 5+ on power. CAN BUS data shows about 60 PSI under throttle.

I can ask my shop what they do when I'm back over there, they use these pumps 964/993 builds.
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Old 05-16-2018, 12:49 PM
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Gus
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Would greatly appreciate you asking shop. I have installed the GT3 pump in my 964 3.6 and wondering if I need to adjust spring tension on the release valve. Believe safety valve is OK as itĺs limit is at 9 bar or 130 lbs.
thanks
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Old 05-16-2018, 01:49 PM
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feirfiez
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Are you all using 996 or 997 GT3 oil pumps or do both work?
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Old 05-16-2018, 02:35 PM
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Gus
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996 - It is not a drop in - the case has to be modified on side and structural flange. Inside case aluminum has to be removed inside to allow for the over sized pump which has an additional pick up and higher volume. Other than that it is pretty close to a drop in.
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Old 05-18-2018, 09:16 PM
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onevoice
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Originally Posted by Gus View Post
I have not made the reduction and my oil pressure appears to be excessively high, running above 4 bars on start then settling at about 3 bar at idle after warm up and 5 bar on any throttle input taking engine above 2K.


Thanks
Why do you think those numbers are high? They are exactly what mine runs, with a standard pump. Complete rebuild with all clearances set to spec.
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Old 05-19-2018, 09:07 AM
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Essex
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I run a GT3 oil pump in mine. Other than the case mods, nothing changed. Runs fine IMO. (Liqui Moly 10W60 oil)
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Old 05-19-2018, 11:10 AM
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Moriartyhlms
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For what it’s worth, I also run a gt3 oil pump and have never heard of anybody modifying the pressure relief or safety valves for this.
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Old 05-20-2018, 08:11 PM
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sundog
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Same for me. I put it in on a rebuild, and the pressure runs higher than it used to on the standard. It's got 60K miles on it, and half of those on the track. So no big deal running it high.
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Old 05-21-2018, 09:58 AM
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Gus
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Thanks all for feed back - sounds like best is to leave as is and just run it. Really appreciate feedback, again THANKS.
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