Operating Temps
#1
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Operating Temps
2021 PDK Spyder with 1200 miles. Still under a modified run in; but routinely in the 4-6500 RPM region now.
Starting to note several characteristics as I get used to the car. Today was clear, 55F, and had been running in the hills for over an hour.
I notice that when driving typically the water temp is a constant 221—all the time. Not just today, but in much warmer weather also.
However, I notice that when driving in “anger” the water temp dramatically drops to 183–like rapidly.
Put it and 7th and grandmother it at same speed drifts back up to 221. Bang down a couple gears and start whipping it back down to 183.
Perhaps this is old stuff for the knowledgeable, but thought it was note worthy.
Obviously for emissions 221 is the best spot, but when the car senses the need for some cooling it opens up more capacity.
Anyway, perhaps a tech guru can fill in some specifics.
All threads are better with RY car pics so here ya go...
Starting to note several characteristics as I get used to the car. Today was clear, 55F, and had been running in the hills for over an hour.
I notice that when driving typically the water temp is a constant 221—all the time. Not just today, but in much warmer weather also.
However, I notice that when driving in “anger” the water temp dramatically drops to 183–like rapidly.
Put it and 7th and grandmother it at same speed drifts back up to 221. Bang down a couple gears and start whipping it back down to 183.
Perhaps this is old stuff for the knowledgeable, but thought it was note worthy.
Obviously for emissions 221 is the best spot, but when the car senses the need for some cooling it opens up more capacity.
Anyway, perhaps a tech guru can fill in some specifics.
All threads are better with RY car pics so here ya go...
#2
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My 2020 718 Spyder typically shows water temperature at 218 to 221 degrees though I haven't driven it hard yet to learn what effect that would have on coolant temperature. Currently it has less than 1100 miles on the odometer. At some point when the pavement temperatures are bit higher I'll take it for a drive to develop a better feel for how the Spyder handles and reacts to aggressive driving.
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Obviously for emissions 221 is the best spot, but when the car senses the need for some cooling it opens up more capacity.
Likely will be the subject of another class action lawsuit in a few years since it's an "emissions test defeat" device.
(Sorry, for that. The current EU investigation and stop-sale on used 981/991 has my sarcasm **** turned to 11.)
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DFW01TT (12-05-2020)
#7
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No change to slight increase. Looking at the gauge red zones, oil has a much higher threshold than water. Just looking at the delta on the bars. I mean this is on public roads, so hard to tell how much lower water temps impact oil over a longer time. Still 38 degree drop in a few seconds is pretty cool.
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phefner (12-06-2020)
#9
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Burning Brakes
Pretty well much the same Down Under - tooling around town runs at around 220 with oil at 235 but cranking up her over 70mph on the Freeway and the temp suddenly drops 40°F - keeping the revs 3-5k
Last edited by Mercuriell; 12-06-2020 at 04:16 AM.
#11
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Viper pilot (12-06-2020)
#12
Drifting
In the non-GT 991, coolant temperature is always pegged in the middle even with sport and sport plus. It was just a dummy gauge that doesn’t show real time change.
Oil temp is real time and drops when you go into sport/ sport plus mode. Even battery voltage goes up for some reason when you go into sport/ sport plus.
Interesting how the Spyder drops coolant temperature but not oil temperature. Wonder what kind of algorithm is going on. Maybe a mid-engine thing?
Or did you guys wait long enough?
It takes a lot longer for oil temp to drop compared to coolant.
Oil temp is real time and drops when you go into sport/ sport plus mode. Even battery voltage goes up for some reason when you go into sport/ sport plus.
Interesting how the Spyder drops coolant temperature but not oil temperature. Wonder what kind of algorithm is going on. Maybe a mid-engine thing?
Or did you guys wait long enough?
It takes a lot longer for oil temp to drop compared to coolant.
Last edited by Dyim; 12-06-2020 at 11:05 AM.
#13
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I'm not an automotive engineer, but it would seem that managing engine coolant temps is the place to focus efforts on -- for a variety of reasons.
#14
Drifting
I am thinking the car goes into ‘sport mode’ automatically during sustained aggressive/ high revs driving.
There is no sport button to press, the car decides for you.
Oil temp probably will drop eventually if you keep at it.
In my 991.1 C2S, I would say it takes at least a few minutes if not longer to see oil temp dropping if you go into sport/ sport plus. In that car, PDK also holds lower gear longer during aggressive throttle and braking inputs, or high lateral Gs. The PDK goes into sport mode automatically even in normal mode.
Does the battery voltage increase when you see the coolant temp drop?
There is no sport button to press, the car decides for you.
Oil temp probably will drop eventually if you keep at it.
In my 991.1 C2S, I would say it takes at least a few minutes if not longer to see oil temp dropping if you go into sport/ sport plus. In that car, PDK also holds lower gear longer during aggressive throttle and braking inputs, or high lateral Gs. The PDK goes into sport mode automatically even in normal mode.
Does the battery voltage increase when you see the coolant temp drop?
#15
Re the comments about the center radiator "opening"- all three radiators are active, there are no valves involved. As mentioned in other threads there is a "map controlled thermostat". It has a heating element which is used to apply different cooling modes.