Anyone's Auto Z behaviour change when the car can't recognise a speed limit?

[thehunter699]

Something I noticed a bit strange. In my Nismo Z when the car cannot detect the speed limit it seems to rev/stay in gear longer.

I.e sport mode, 3rd gear 4k revs, doing 60-70km/h.

When it detects the speed limit is 70km/h, as soon as I get to around 70 it will upshift and sit 1500 revs unless I'm foot to the floor.

Coming from a manual 370z I am hating how the car is trying to be fuel efficient all the time. Even in sport plus, it will try and be fuel efficient when you're at cruising speeds.

Am I losing my mind here? Lol

 

[chadhunley]

Not sure I've noticed this. I tuned off all the speed limit assist and other stuff like that. I'll check into it and see how my settings are, and report back later.

 

[mikecarpage]

maybe it's done in an effort to be more efficient on public roads as opposed to track use? no speed limit on track = more spirited driving?

 

[heritageownerKurosawaz400]

Something I noticed a bit strange. In my Nismo Z when the car cannot detect the speed limit it seems to rev/stay in gear longer.

I.e sport mode, 3rd gear 4k revs, doing 60-70km/h.

When it detects the speed limit is 70km/h, as soon as I get to around 70 it will upshift and sit 1500 revs unless I'm foot to the floor.

Coming from a manual 370z I am hating how the car is trying to be fuel efficient all the time. Even in sport plus, it will try and be fuel efficient when you're at cruising speeds.

Am I losing my mind here? Lol

I think from personal experience it has to do with Transmission Temp and the way of driving, when the trans gets up to temp it is holding gears longer in general, and naturally going 70 cruising the shift logic will just adjust to that, if it’s sport plus it would be different. And again the modes learn your driving style.
Any more info would be greatful.

 

[thehunter699]

I think from personal experience it has to do with Transmission Temp and the way of driving, when the trans gets up to temp it is holding gears longer in general, and naturally going 70 cruising the shift logic will just adjust to that, if it’s sport plus it would be different. And again the modes learn your driving style.
Any more info would be greatful.

That's a good point. I didn't pay attention to transmission temp. Will take a closer look today and see if I noticed differences. I turned off the speed limit tech the other day. Might be placebo effect but I noticed a slight difference in rev range. Although maybe transmission was warmed.

 

[BigBlue]

That's a good point. I didn't pay attention to transmission temp. Will take a closer look today and see if I noticed differences. I turned off the speed limit tech the other day. Might be placebo effect but I noticed a slight difference in rev range. Although maybe transmission was warmed.

That's interesting. No telling how many speed signs I've pasted at triple digits. I did notice a difference, the car wanted to go faster.

 

[Katum68]

Not sure I've noticed this. I tuned off all the speed limit assist and other stuff like that. I'll check into it and see how my settings are, and report back later.

What is speed limit assist? My speed limit is controlled by my right foot. Do't lie the cars around me, press the Lous button and I'm quickly doing 90 (note to police: this is just talking, no actually speed limits were broken) .

 

[RadzShadow]

Being in the US, I haven't had this happen. I have a Uniden R3 that is really ... really sensitive to when there are radars/lasars around, usually a mile or more out. I paid US $300 for and saved me that much the first day . Like @Katum68 said "(note to police: this is just talking, no actually speed limits were broken) ."

 

[C89]

I noticed the car can 'sense' how I'm driving, for example how fast I'm going around corners and therefore shift based on that.

Though I did notice a couple of days ago that when I turned into a small side street, the car was just holding gear 2, doing around 40-50km, even when I was just driving normally, I had to double check that I wasn't in manual mode. It was quite strange that I couldn't get the car to shift.

 

[FSUZ33]

Same here. My NISMO loves 3rd gear. Not all the time, but typically very light to probably 20% throttle, and In Standard and Sport (haven’t checked for it in Sport+). It’s not temp-related for me, as it happened after a 30+ minute drive today.

Posted about it the other day:
https://www.nissanzclub.com/forum/threads/at-3rd-to-4th-gear-shift-issue.5748/

 

[Z-ski]

My 9AT Performance did seem to like to hang on to gears a lot longer and run at much higher RPM the couple of times I took it on the track at Dominion Raceway. And somtimes it will inexplicably do the same thing on a random street or tunnel.

I'm probably just crazy, and it might be a driving style or temperature thing, but I had the same thought about the speed limit sensing before reading this thread.

 

[RadzShadow]

I have been watching this and haven't seen a difference at all, other than the little speed limit sign show up in the dash ... like I care. I didn't drive speed limit in the 2003 Dodge Neon ... and I definitely can't in a 2024 Z.