Gus

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

Spyerx

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.

Gus

feirfiez

Are you all using 996 or 997 GT3 oil pumps or do both work?

Gus

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.

onevoice

Essex

I run a GT3 oil pump in mine. Other than the case mods, nothing changed. Runs fine IMO. (Liqui Moly 10W60 oil)

Moriartyhlms

sundog

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.

Gus

rogerkamp8817

Any updates on your oil pressure and whether or not you adjusted you oil pressure valve to bring it down or just running it as-is?

Gus

Not really, I have left alone. But did, on last oil change, switch to a lower weight oil. Not much difference on start up, little better when warm. ECU data shows around 90lbs at higher RPM , 4500+

rogerkamp8817

nice. my ecu shows my current 964/993 pump runs at 44 psi around idle and 90 psi around 4500 rpm. i was thinking the gt3 pump would increase the pressure way too much above these numbers but sounds like its a non-issue.

sundog

One thing I do know is that running the GT-3 oil pump with the Mobil-One 15-50 on the track the car stays very cool, and the gauge is always up near 5.

Peteinjp

What’s the advantage of the Gt3 pump over the stock unit?