718 Coding using Launch X431 tool

[718socal]

Yes that is the behavior.

[blueline]

To be clear, my 2021 Turbo S coolant temp starts at ambient and warms up to 194 the way you'd expect. Once it gets to 194, however, I've never seen it move off that number. Tim, does your coolant temp fluctuate after it gets to 194 -- up at stop lights, down on freeway, etc.?? If so, that must be a 2022 model (or latest software update) thing that my old jalopy doesn't have.

Well, that's where I may have missed (and misunderstood) the whole picture that Arne was explaining. To answer your question, I'm second guessing myself so at this time I don't know for sure. I've never tracked the Turbo S (and obviously not the Cayenne Turbo) where I would have been more acutely aware of coolant temps.

So, now I'm wondering if those two are doing the same thing as yours. I need to experiment on the TTS and the Cayenne some more. Like you, both the Cayenne and the 992 start at ambient and move up as expected which was different from what Arne was describing, so I assumed ( ) that the temp gauge behavior of the two vehicles was as it should be, since it wasn't the stepped readings that Arne was describing. Also, they're Porsches and on the performance side to boot so I assumed (there I go again) that Porsche would never, ever think about tricking us!

I'll be doing some detailed exploring, questioning and record keeping over the next few weeks to see what I can turn up.

A great way to really test the Turbo S would be to put it on track, something I have been ambivalent about. I need to push the car a bit for an extended period, not easy to do in a TTS (or any Porsche) on streets/highways/interstates without going to the hoosegow for a very long time.

I know what the GT4 does temp-wise (oil and coolant) because it's on track a lot (again tomorrow if I can swing it), so I try to pay a little bit of attention to temps and pressures in that environment.

[blueline]

From my experience with 982, Porsche did not expect people with Base, S or GTS to track their cars . Only the GT4/RS and Spyder have the actual coolant readings. . I don't know about 992.

The GT4 also has actual readings in addition to the 4RS (which you may have meant when you wrote GT4/RS and Spyder).

[blueline]

No, most late model Porsches do have the dumbed-down coolant gauge. I got this info from a 991 discussion in a different forum, and it was confirmed in a Macan group, and with several 718 and 981 owners. It's possible that the Turbo models (emblem'd as such, not just turbo-equipped lesser models) get the "real" numbers like the GT cars do, yours is the first I've heard of that possibility.

The gauge doesn't read true numbers until 257°F, but at actual 239°F the displayed temp suddenly jumps from 194°F to 221°F, and at 245°F (actual) it jumps again to display 239°. My understanding is that the overheating warnings start at the 239°F (actual) mark.

Luckily this is easy to fix with a quick re-code.

Thanks for that info. I am shocked that Porsche would do this but I guess I shouldn't be surprised at much of anything anymore.

It's good that 'Turbo' badged vehicles apparently get the full functionality. (Tom's doesn't though - what's going on with that?) An honest, full reading should be normal/standard on every P-car (and every car no matter the make assuming some kind of real gauge). This dismaying!.

Very fortunate that you have a solution for those that want the capability and have shared the same.

Tim and Tom,
Are both of your turbo s cars the same year? If so, build date? That would be strange for one to have the GT accurate coolant gauge and the other to have the dumbed down one unless there was a mid model change. Weird!

Tom's is a '21 and mine a '22. There are differences that we've discussed such as the passenger side footwell power port that I use constantly with my Ctek maintainer with no issues whatsoever but that doesn't cut it with Tom's car. Different hardware, diff suppliers, diff software - who knows.

However, this may boil down to my misunderstanding on how the coolant temp gauge actually works. (Or rather, pretends to work! )

[Arne2]

If your gauge shows a very stable 194° with no deviation, it is not displaying real data. It's been "laundered".

[blueline]

If your gauge shows a very stable 194° with no deviation, it is not displaying real data. It's been "laundered".

I like that - "laundered". My vehicles are laundering temps - lying! For shame!

But, I understand the method of verifying that you stated. The testing will commence.

[718socal]

I don't understand the reasoning from Porsche. If you see the temperature go up from 194 to 239. It might be already too late Here is a screenshot of my Coolant gauge now

[718socal]

If @blueline and @Tom are interested in Full Matrix coding. Let me know.

[Larry C]

If @blueline and @Tom are interested in Full Matrix coding. Let me know.

Can the coolant coding be done remotely?

[718socal]

If @blueline and @Tom are interested in Full Matrix coding. Let me know.

Can the coolant coding be done remotely?

Yes it can. I have done many.