718 Coding using Launch X431 tool

[Tom]

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.

Really?!! What connects to the remote car?

[718socal]

Can the coolant coding be done remotely?

Yes it can. I have done many.

Really?!! What connects to the remote car?

PM me. I don't want to hijack this thread.

[blueline]

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

Yes and thank you. Will want to pursue this at some point.

[blueline]

Arne, I have some GT4 temp gauge data that I collected from my car. I can start a new topic or just post it here but I don't want to detract from the coding intent of your thread.

On the positive side, it will help keep the thread active; on the downside it takes away a bit from the pure coding guidance and data that you provided. Back to the positive, it will also will further document some of my findings regarding the coolant gauge matter which is relevant to that particular coding. (I also plan on eventually digging into the behavior of the 992 TTS and the Cayenne Turbo to see exactly what my cars do in that respect.) Your call.

In any case, I figure what I share might be of use for both you and @718socal (and others).

[718socal]

Arne, I have some GT4 temp gauge data that I collected from my car. I can start a new topic or just post it here but I don't want to detract from the coding intent of your thread.

On the positive side, it will help keep the thread active; on the downside it takes away a bit from the pure coding guidance and data that you provided. Back to the positive, it will also will further document some of my findings regarding the coolant gauge matter which is relevant to that particular coding. (I also plan on eventually digging into the behavior of the 992 TTS and the Cayenne Turbo to see exactly what my cars do in that respect.) Your call.

In any case, I figure what I share might be of use for both you and @718socal (and others).

Either way is fine with me. As long as we can help others. I am pretty sure your GT4 coolant temperature is showing the actual and not the "fake"

[blueline]

It is, but I still found some things that were interesting. I'll try to post that later tonight!

[Arne2]

Since the primary coding stuff is on the first few pages, I'm fine with you posting it here.

[blueline]

GT4 coolant temp observations -

Drove down to Barber MSP from Nashville early yesterday morning for a Chin track day. 225 mile trip each way plus time on track so I had a lot of temp gauge observations and was able to play around to see how the gauge reacted. (By the way, my back let me know it was done-in and on strike after the two non-stop 3.25 to 3.5 hour trips there and back. I love the lightweight buckets and they feel great sitting in them, but not being able to adjust LWB's to any real degree had me frozen in a permanent sitting position by the time I got home last night.)

Anyway, back to the subject - the coolant gauge works as expected, rising incrementally from ambient at cold start, reaching 221°. The temp progression was fairly quick as usual (much faster than oil temp as we know), moving up steadily in single digits or small groups of 2, 3 or more digits at a time.

I drove interstate at a steady 80 to 90 mph whenever possible, sometimes higher, depending on traffic (horrible at times), trucks (passing other trucks at a 1-foot-per-hour overtake speed), and LLS's (left lane squatters). The temp held steady at 221° no matter whether 40 mph or 95+. I was concerned that maybe that was an artificial limit but that turned out to not be the case.

If I did a quick, instant small throttle blip, the temps would drop to 215° - 218° range a couple of seconds afterward and then move back to 221° fairly quickly. If I did a full (or almost full) throttle and held it for 5 or so seconds, the temps would drop to the 180°'s or lower range before making their way back to 221° in relatively short order. (Rough guess, maybe 15 or so seconds to get back to 221°).

On track, driving hard, the few coolant temps that I had the time to observe were in the 205° - 207° range. (Oil temps are much higher than usual under track conditions.) Coolant temps would rise at pit-in but I didn't watch that close enough yesterday to make mental note - distractions. (I'll watch closer next time.)

Now for the concern that 221° was an unnatural or artificial limit: it wasn't. When encountering a crawl situation of say 15-20 mph following interstate speeds, the temp would drop to maybe 218° before rising to 223° for a very brief period. The car would then settle back into the 221° temp that it seems to like so well.

Just a wild guess, but maybe the car has been engineered a lot more than I would have thought to run at what must be the optimum temp for gas mileage and low emissions. Is that a possibility?

Anyway, the gauge in the GT4 works, as others here have indicated it would. I'd like to test it on a blisteringly hot day in stop and go traffic to see what happens. My feeling is that it will remain at 221°. The only real oddity that I noticed was a couple of missing numbers. At the upper ranges, changes would usually be in one or two digit increases. (Temp drops were in larger chunks of three or four.) During those periods I saw most digits between 200 and 221 but I never saw the numbers 220 or 222. I guess Porsche doesn't like those two numbers 'cause I don't think they exist in the digital gauge's programming!

[718socal]

Very good analysis and feedback. One thing that I would add is that in Sport Mode the Coolant temperature drops to 185 F or so. It is the extra cooling you get in Sport Mode. I hardly drive with Sport + so I don't pay attention to the Coolant temperature.

[blueline]

Very good analysis and feedback. One thing that I would add is that in Sport Mode the Coolant temperature drops to 185 F or so. It is the extra cooling you get in Sport Mode. I hardly drive with Sport + so I don't pay attention to the Coolant temperature.

Great info - thank you! (The GT4 has no mode dial, so no Sport or Sport Plus mode per se, as I know you already know. For GT4's it's the PDK Sport button on the console which is what you are referring to in my case.)

GT4's only have two performance settings. However, the little car's standard setting is basically a Sport default anyway - it's just not called that. It's always eager to run like the devil. Going to the next (and highest) level, PDK Sport, is about as much fun as one can have in a car - a performance level on steroids. And this is coming from someone who has a '22 992 Turbo S.

Yes, it is tough to drive for long on the street in PDK Sport (the Sport+ equivalent) - it's just mapped way too high (same as with the Turbo S in Sport +), so I've never paid any attention to the GT4 coolant temps in PDK Sport because I don't use that mode on the street. Now I know, which is excellent info.

More importantly, that explains why the temps are lower when I'm on track where the car is always in PDK Sport. Brilliant @718socal ! That makes so much sense. It never crossed my mind that that was the reason the car temps were lower on track which actually seemed counter-intuitive to me. Those sneaky German Porsche engineers don't miss much do they! Amazing bit of technology that most of us are totally unaware of. That's impressive.

I'll try PDK Sport on the street in the next day or so to see how the coolant temps react in that environment.