DrewAltemara

My understanding is that once the water temp reaches 194F and stays in the normal range the digital and analog displays 194F even though the true water temperature could be quite a bit higher and that it does not show the true temperature unless the water temperature rises above appx 225F. Is this correct?

Why did Porsche do this?

Can the water temp display be reset to display true water temperature either in the Porsche settings or with something like an icarsoft scanner?

Still learning about my car; 2014 Carrera S2 it seems.

Thank you,

Drew

DaveGee

Correct.
Because they can.
No.

DaveGee

DrewAltemara

Thanks Dave.

That is what I thought.

Drew

pfan

The 991 Technik Introduction document details a great deal of technical information:

https://cardiagn.com/911-carrera-911...e-information/

DrewAltemara

This is excellent. Thank you. I looked in the operating manual and at the Porsche NA site but could not find anything about it. This helps. Drew

asellus

Yep. It's to keep people from calling the dealership thinking their cooling system is boiling over or at risk of boiling over, when it's just fine and within operating temperature. I'm guessing they don't do this for oil because boiling oil isn't a concept many people jump to, whereas water's 212F/100C boil temperature is widely known (can you spot the problem here?).

Many vehicles have analogue gauges that are just idiot lights in disguise. Mazda made their oil pressure gauge an on/off switch in the Miata in 1994 because too many people were calling the dealership because a gauge was going crazy on their dashboard, for example.

If you hook up an OBD2 tool (like any ELM237 bluetooth dongle + Torque on your phone), you can read the actual coolant temperature and see that it ranges from upwards of 215F to below 190F based on various conditions, including whether or not you're in sport or sport+ mode.

I suspect the likes of APR with their reprogramming of the ECU could locate and modify the code in the gauge cluster module to alter this behaviour, but the effort/reward ratio is likely far too low for them or anyone like them to care enough to even try.

Noah Fect

Gauges that lie to you are a canary in the proverbial coal mine, sort of like the electric handbrake parking brake. It's a sign that cars nowadays are designed by engineers who take a bus to work, and that Porsche is no exception. The message? "Buy now before they get even dumber!"

Message received, I guess...

blepski

The most infuriating part is that the GT car coolant temp gauges are not buffered or at least not nearly to the extent of the "regular" non GT sports cars which are locked to 194.

I don't know what to make of that besides it being Porsches way of saying that they consider the GT car buyers to be more intelligent whereas my life experience tells me there is almost zero correlation between wealth and intelligence.

arter

If the coolant temp gets above 221F, the readout will show the actual temp.

Something us track guys can see at times......

BSO

I’m sure everyone knows that putting water under pressure increases its boiling point. That’s one of the reasons why cooling systems are pressurized.

A reading above +212F in a pressurized system doesn’t mean it’s boiling as the water can hold more heat energy.

So the problem is that people see temps 212 plus and think trouble.

I imagine that Porsche got frustrated trying to teach science to customers.

Rich_Jenkins

Is this a .1 thing?

I haven’t driven my .2 ‘17 C2 in a bit, but seem to recall in Sport, the water temp averages 194, but in normal it’s around 217?

barncobob

never seen anything hotter than 194 ... your 217 is that the oil temp by chance and not the water as it doesnt show over 194

Jack F

That was most likely your oil temp.

Rich_Jenkins

*slaps forehead*

Valvefloat991

I guess Porsche has concluded that its customers are not nearly as smart as they think they are.