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991.2 oil temp-normal vs. sport mode

 
Old 07-21-2018, 03:51 PM
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swisman
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Default 991.2 oil temp-normal vs. sport mode

took a long road trip and noticed a big difference in the oil temp in normal versus sport mode. This was interstate driving in 85 degree weather.
The temp in normal mode ran hotter...varied between 220-230 degrees ...however in sport mode it dropped to 196-203 degrees.
This may be a dumb question, but why would that make a difference?
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Old 07-21-2018, 05:46 PM
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Better gas mileage with a hotter engine. Extra cooling for track use.
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Old 07-21-2018, 05:59 PM
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All newer Porsches are designed to run hot for emissions purposes. Both my 981 Cayman and my Carrera T run hotter in normal mode versus Sport mode. In fact my Cayman runs hotter going to the grocery store in normal mode than it does on the track in sport mode. This was true even before adding the third radiator! Another fun fact.. the Cayman mpg increased about 20% when I got a Cobb tune. More power plus more mpg. Win win! Of course the track mpg is still only about 7-8.
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Old 07-21-2018, 06:23 PM
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Thanks...so I assume the ECU controls when the thermostat opens in the various modes?
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Old 07-21-2018, 06:57 PM
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I noticed my oil temperature had climbed up to 237 degrees in "normal" climbing the Ridge Route on I-5 heading south towards Los Angeles from Bakersfield last Thursday afternoon. Over 100 degrees outside and climbing in 6th gear doing over 75 mph. I clicked it into "sport' and within 10 miles or so it had dropped down to 194 degrees oil temperature nearly matching the 196 degrees water temperature.
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Old 07-21-2018, 07:05 PM
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Originally Posted by swisman View Post
Thanks...so I assume the ECU controls when the thermostat opens in the various modes?
I think it's more a function of the louvers before the radiators stay open in Sport, Sport+ mode vs. staying closed in Normal mode.
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Old 07-21-2018, 07:11 PM
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I should have mentioned that my 991.2 is a GTS...so no louvers.
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Old 07-22-2018, 12:13 AM
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Have only had my new PDK 991.2 C2S for 4 weeks, 500 miles, but will say this. Have never seen my oil temp above 210F, even in mid - 90s and one wet DE track day. It runs cooler than my previous manual 991.1 C2S Coupe that would go above 235F. I'll update as i learn more...
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Old 07-22-2018, 07:31 AM
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Originally Posted by 09RedGTS
Have only had my new PDK 991.2 C2S for 4 weeks, 500 miles, but will say this. Have never seen my oil temp above 210F, even in mid - 90s and one wet DE track day. It runs cooler than my previous manual 991.1 C2S Coupe that would go above 235F. I'll update as i learn more...
Fresh oil runs about 10 degrees cooler. After about 2,000 your oil temps will become more similar to your prior 991.1.
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Old 07-25-2018, 07:06 PM
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991.1 does this as well... Only opens the extra radiator for sport mode I guess?
While I'd love to drive in sports mode (and cooler) all the time, I leave it in normal mode on purpose on occasion to bring the oil temp above water boiling point for a 15 minutes or what have you, on purpose...prevents the formation of mayonnaise !
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Old 07-25-2018, 09:42 PM
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My 991.2 GTS does the same in 100 plus degree Texas heat. Sport mode cools down the car effectively
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Old 07-26-2018, 12:53 AM
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Originally Posted by Greg D. View Post
.prevents the formation of mayonnaise !
You're showing your age, when did you last see mayonnaise in any decent engine?
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Old 07-27-2018, 03:14 PM
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Originally Posted by _RS_ View Post
You're showing your age, when did you last see mayonnaise in any decent engine?
You're most certainly right (and I can't see it on any modern car - but then again you see nothing on a modern 911 anyway) but that's 30 years of maintaining my old cars for you and the principle in theory remains sound, I want the oil temp to get above water boiling temps now and then, just in case, I imagine it'd give the AOS something to capture that way ;-)
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Old 08-01-2018, 08:01 AM
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Got the same results with my GTS - question is what oil operating temp the engineers consider optimal. Has anyone found any literature on this? Assuming that they increased cooling for lowered temps with more aggressive or track driving to bring the temp back down to an optimal temp which is? There might be a good engineering reason for not running it cooler than optimal.
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Old 08-01-2018, 08:14 AM
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Got the same results with my GTS - question is what oil operating temp the engineers consider optimal and why. Fuel economy, power, engine life? Assuming that they increased cooling for lowered temps with more aggressive or track driving to bring the temp back down to a specified range. Is this range what’s best for engine life?
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