991.2 GT3 High Oil Pressure
08-05-2019 | 01:12 AM
#46
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Sometimes I'm tempted to buy this and fill out every blank with functions I don't have even though they are useless. I hate them being blank.
08-05-2019 | 01:31 PM
#47
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From: Shenandoah Valley, Va
Keep in mind the typical rule of thumb is 10 psi for every 1000 revs.
Too much pressure robs power, too little pressure robs lubrication so its a fine line over the entire rev range for any given load parameter.
Too much pressure robs power, too little pressure robs lubrication so its a fine line over the entire rev range for any given load parameter.
08-05-2019 | 01:42 PM
#48
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Those are boring - if you’re OCD enough to need to fill the blanks, at least get some jokey ones with a sense of humor (seen them once before)
08-05-2019 | 08:22 PM
#50
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From: Chicago, IL
Oil pressure was never the same in any of the other 911's I've had, but it's the magnitude of the pressure that's different here. In other models I'd accelerate and watch the oil pressure rise. With this GT3, it's locked in above 60 psi most of the time.
Yeah the idle speed when cold is around 1000 rpm, 750 or so when warm. But to me that's not enough for a 4.5 bar level vs. 2.0 bar when warmed up. Seems like big delta with just oil viscosity change.
GT3 standard spec is a fully variable hydraulic oil pump with 7 suction stages. This is a different oil pump than other, non-GT models...No other Porsche I've had (997, 3 other 991s, PTT) has oil pressures this high, and they didn't behave this way at idle...pressures run higher at idle even after warm-up. 991.2 TT ran about 1.5 bar at idle...GT3 is about 2.0 bar. My GTS was similar to 991.2 TT.
At speed on highway when car is warmed up, it's running ~ 62 psi or so...much much higher than what I recall in other models.
992 C2S lists the oil pump as 'on demand, controlled oil pump' - which I think is similar to other non-GT models.
Yeah the idle speed when cold is around 1000 rpm, 750 or so when warm. But to me that's not enough for a 4.5 bar level vs. 2.0 bar when warmed up. Seems like big delta with just oil viscosity change.
GT3 standard spec is a fully variable hydraulic oil pump with 7 suction stages. This is a different oil pump than other, non-GT models...No other Porsche I've had (997, 3 other 991s, PTT) has oil pressures this high, and they didn't behave this way at idle...pressures run higher at idle even after warm-up. 991.2 TT ran about 1.5 bar at idle...GT3 is about 2.0 bar. My GTS was similar to 991.2 TT.
At speed on highway when car is warmed up, it's running ~ 62 psi or so...much much higher than what I recall in other models.
992 C2S lists the oil pump as 'on demand, controlled oil pump' - which I think is similar to other non-GT models.
A lot of these older 996 cars have high oil pressure. Sure, it may waste a bit of fuel/efficiency, but high pressure is a good thing, even if pegged on the gauge may look like a problem, it’s normal. BTW, I run 0-40, so 5-50 would probably be even higher pressure.
08-05-2019 | 09:30 PM
#51
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From: Santa Monica, CA
08-06-2019 | 12:11 AM
#52
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