It was a sunny day and I needed to take a break from some overdue paperwork. Decided to play with my iCarsoft POR II.
Ran a data stream to record the following below .......NR- No Reading
sorry about the pics, my passenger was not accommodating

Ambient temperature 2C, 35F

1.occurrance time ...............2. Dash gauge temp .........3. Scanner Temp ........4. Dash Oil Gauge

1:27 initial start up..................NR 40C,100F..............................69F..............................N R 60C

1:37 Dash gauge movement.........47C,116F ............................116F.............................. NR
1:39 .........................................60C,140F ............................140F...............................NR

1:41........................................ 80C,176F..............................156F.............................. .NR
1:42 ........................................80C,176F........................ ......163F.............................69C 156F
1:46........................................ 80C,176F..............................185F.............................7 5C 167F

heat sink Idle............................ 80C,176F.............................190 F............................90C 194F
hot throttle, aggressive ..............80C,176F.........................185-188F..........................90- 92C 194-197F

As you can see the dash gauge is not accurate at the 80C ,176F mark and holds there from 156-190F
I can't find an oil temp data stream on my POR II

8-10 mins before coolant temp increases on dash
15 mins before oil gauge begins to move
19 mins before I am up to coolant operating temp and oil is still 30F below operating temp

1:27

1:27start up







1:39

1:39




1:41

1:41





1:46

1:46

1:46

Nice data. From memory the coolant gauge on the instrument cluster is nothing more than an idiot light. Your data confirms it - when hot it holds at 80C even if above or below by tens of degrees. The oil gauge is fairly accurate though. So without external equipment attached use the oil temps to monitor engine temps.

I don't think you can get oil temps from the OBD-II connector. You would need to install an third party sensor if you want to log oil temp data. I could be wrong on this point though depending upon model.

Good to see data. This confirms what many have been saying. The oil temp gauge has no problem moving up and down. I suspect this is accurate and the most crucial temperature to monitor.

Thanks for the share.

I can get a lot of data including oil temperature from CAN bus using AiM Solo DL. Very useful at the track approaching dangerous 250F...Water gauge is useless but oil is somewhat accurate. At least it moves up and down.

The coolant gauge rises showing the engine has coolant and is warming up and clips the rising temp curve at 175F.

The oil gauge is accurate and should be monitored.

More important though is the heating profile curve of the oil gauge. No revs above 4k before oil temp is at least 175F and even then no sudden throttle flooring (especially in winter time). This, of course, if one wants the flat 6 to last.

docdrs, I think we told you this about the coolant temp and gauge in the low temp thermostat thread. Glad you took the initiative to prove it to yourself as well and thanks for posting. Ignore the water temp gauge (idiot light) and base everything off the oil temp, which is an actual gauge.

I know it was mentioned. I wanted to see what was actually happening as it was easy having a scanner and posting actual data, I did a search and never found any. Makes me wonder why they would put relatively useless gauge in these cars and at what temperature if any would it start moving again? The oil temp may be on the POR II so that will be my next data run if I can find it.
Note....this logging was done at ambient 2C, 35F so the radiator efficacy would be quite high....i'll be interested if similar values occur at a 80F ambient

this was brought up recently on the Facebook 997 enthusiast forums (i think he may be a rennlister here). the idiot light is due to the real water temps freaking out many owners, so porsche just made the water temp gauge stop at 175F/80C. the value is only 'real' again if water temp is literally overheating and a warning indicator+chime will then activate. sounds crazy i know.

the oil temp gauge on the other hand is pretty accurate.

Just an homage to our air-cooled brethren where all that mattered was the oil temp (and pressure)!

There you go!

2009 C2S 120K miles

Check out my thread where I captured and graphed oil and water temp data among others. As I note in the thread, Durametric data is odd in that there appears to be a few collection buckets for water temp..... I am not sure I am collecting the idiot number or the real number.... I never pushed the car and the collection was done on a cold winter morning.... so there was no temps over 180ish. But, it looks kinda real to me.

https://rennlist.com/forums/997-foru...tric-data.html

BTW, you will notice the oil and water temp follows the pattern denoted by Baz that the water temp acts a an oil heater and then transitions to being an oil cooler after warm up. Interesting stuff.

Peace
Bruce in Philly

Thanks Bruce, thats some good info.

deleted. Wrong thread.

Does the PORII detect fuel trims and can it read a rev report?