Oil Temps in Sport Mode
08-04-2019, 10:35 AM
#16
Burning Brakes
Actually, the thermostat in the water cooling system drops the water temp from about 220 to 180 when you engage sport mode. Y0u don't see this on the gauge because it is dumbed down and always reads 194, except when the engine is warming up or comprehensively overheating.
The oil is cooled by an oil/water heat exchanger, so when the water temperature drops, the oil follow accordingly. When running hard on the track, however, this heat exchanger can't keep up and the oil temperature rises again, but not as high in sport mode as it would in normal mode.
The oil is cooled by an oil/water heat exchanger, so when the water temperature drops, the oil follow accordingly. When running hard on the track, however, this heat exchanger can't keep up and the oil temperature rises again, but not as high in sport mode as it would in normal mode.
08-05-2019, 01:33 AM
#18
The higher temp does technically increase the rate that moisture evaporates off the oil, yes. Moisture is still able to be extracted from the oil at lower temps, just like when you try to boil water on the stove, you see lots of vapor coming off the water at lets say 180F. The crankcase is under a relative vacuum as well, so that helps as well.
Regular oil changes are the only way to remove the contaminants, though, as those are left behind after the moisture is evaporated off.
Regular oil changes are the only way to remove the contaminants, though, as those are left behind after the moisture is evaporated off.
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Mike Murphy (08-05-2019)
08-05-2019, 09:12 AM
#19
It doesn't take long unless ambient temps are really low, then you have to worry about the summer tires heating up for grip.
08-05-2019, 09:36 AM
#20
Rennlist Member
Actually, the thermostat in the water cooling system drops the water temp from about 220 to 180 when you engage sport mode. Y0u don't see this on the gauge because it is dumbed down and always reads 194, except when the engine is warming up or comprehensively overheating.
The oil is cooled by an oil/water heat exchanger, so when the water temperature drops, the oil follow accordingly. When running hard on the track, however, this heat exchanger can't keep up and the oil temperature rises again, but not as high in sport mode as it would in normal mode.
The oil is cooled by an oil/water heat exchanger, so when the water temperature drops, the oil follow accordingly. When running hard on the track, however, this heat exchanger can't keep up and the oil temperature rises again, but not as high in sport mode as it would in normal mode.
A 981 with our 2.5 quart deep sump runs about 10 deg F lower oil temps than a 987.2 with a standard temp thermostat fitted, as a point of comparison, from customer feedback. Although we do make a low temp thermostat for the 987.2/997.2, it triggers a CEL that doesn't affect operation, but is annoying nonetheless, so we only recommend them for track cars.
08-05-2019, 09:47 AM
#21
Rennlist Member
Never noticed what it does in Normal because I do not drive in Normal mode. That's the mode my wife would use, but she doesn't care to drive it.
I like Sport Mode the best, while manually shifting my PDK. Mine typically runs near 210° on the street. When at my dealer's customer appreciation days at Autobahn CC, I do use Sport+ with PDK in Auto mode. Then I get oil temperatures up in the 230's.
I like Sport Mode the best, while manually shifting my PDK. Mine typically runs near 210° on the street. When at my dealer's customer appreciation days at Autobahn CC, I do use Sport+ with PDK in Auto mode. Then I get oil temperatures up in the 230's.
08-05-2019, 10:38 AM
#22
Rennlist Member
I would imagine that the models that have the articulated vanes will warm up faster with them in the closed position. I don't rev past 3-4K until the oil/water temps equalize, regardless of the time interval.
It doesn't take long unless ambient temps are really low, then you have to worry about the summer tires heating up for grip.
It doesn't take long unless ambient temps are really low, then you have to worry about the summer tires heating up for grip.
One nice feature of sport sport mode is coming off the track. The oil temp thermostat will continue to cool the engine during cool-down laps.