Getting it up in the morning: A 991.1 Oil Temp Study
02-05-2017, 07:07 AM
#16
Rennlist Member
Thread Starter
It's in the Sport Chrono data log. It captures your RPM every second. From there it's just math.
Here's what's in the log (I used lap-length, lap-time, outside temp, and engine rotation speed)
lap no.;
lap-length [m];
lap-time [ms];
lap-time;
vehicle speed [km/h];
lateral acceleration [g];
longitudinal acceleration [g];
outside temperature [°C];
steering angle [°];
engine rotation speed [1/min];
engine temperature [°C];
gear;
height [m];
longitude;
latitude;
longitude;latitude;
Here's what's in the log (I used lap-length, lap-time, outside temp, and engine rotation speed)
lap no.;
lap-length [m];
lap-time [ms];
lap-time;
vehicle speed [km/h];
lateral acceleration [g];
longitudinal acceleration [g];
outside temperature [°C];
steering angle [°];
engine rotation speed [1/min];
engine temperature [°C];
gear;
height [m];
longitude;
latitude;
longitude;latitude;
02-05-2017, 07:10 AM
#17
Rennlist Member
Thread Starter
thanks for your analysis Jay. I had my 911 a few months now, and i do notice that this car takes a while to come to operating temp, almost 10-15 minutes which is a while compared to other vehicles I've driven.
What is the operating temp you guys use before you let it rip?? 180+?
What is the operating temp you guys use before you let it rip?? 180+?
02-05-2017, 07:17 AM
#18
Rennlist Member
Thread Starter
Great post (and nice data-logging and presentation for the benefit of the community)! But I have a dumb question: Is it truly "better" to warm the oil/engine temperature faster? Or are there other (mechanical engineering) benefits to letting the engine achieve operating temperature at a slower rate (say in conjunction with transmission/gear temps)?
Or in keeping with the theme: Is it safe to use 'morning wood' ASAP, or is it better for wear-and-tear to engage in longer foreplay.
Or in keeping with the theme: Is it safe to use 'morning wood' ASAP, or is it better for wear-and-tear to engage in longer foreplay.
However, in keeping with the theme, it's probably best to spend more time on the foreplay as it gives all the other drive train components (PDK, etc.) time to get hot.
02-05-2017, 09:24 AM
#19
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Originally Posted by Jay-S
The car does not accurately report oil temp below 150 because it is simply estimating the temp. Between 150-160 it's a little hit and miss but at least you've got the analogue temp gauge to verify.
02-05-2017, 10:42 AM
#20
Rennlist Member
02-05-2017, 12:34 PM
#21
Rennlist Member
Thread Starter
I don't know for sure. I deduced it based on the fact that the temperature reading in the MFD will decrease from time to time while the engine oil temp is increasing. So (1) my MFD can't communicate with the actual oil thermometer and thus produces inconsistent readings, (2) my MFD has a separate, faulty/erratic thermometer for the MFD, (3) the laws of thermodynamics don't apply to my car or (4) the MFD is estimating the oil temp.
#4 seems the most likely to me although I would be pretty excited about #3.
If someone knows definitively what's going on I really would like to know.
#4 seems the most likely to me although I would be pretty excited about #3.
If someone knows definitively what's going on I really would like to know.
02-06-2017, 10:10 AM
#22
Rennlist Member
There are times I want to let it rip above 4,000 so I wanted to know what the fastest way to safely do that was.
However, in keeping with the theme, it's probably best to spend more time on the foreplay as it gives all the other drive train components (PDK, etc.) time to get hot.
However, in keeping with the theme, it's probably best to spend more time on the foreplay as it gives all the other drive train components (PDK, etc.) time to get hot.
If you've run the engine while driving for 5-10 mins and it's well off the 100F Coolant temperature mark, the water is warm enough, the oil is warm enough, the cylinder head chambers, valves, pistons are hot, you should be good to let her rip. Granted, it may take another 5-10 mins for everything to reach a higher flat maximum safe running temperature, but the flat temperature is there for reasons other than what's safe for maximum power.