that's the way it works; even then the max duration engine off with Auto S/S is 30 seconds - rather pointless

if the HVAC system sees a demand for more heat or cooling in the cabin, Auto S/S won't engage, or it will fire the engine back up to reach the commanded cabin temperature

it was one of those C02 emission schemes to try achieving lower emissions in the test lab

the thing that Auto S/S yields would be light loads at continuous speeds where rpm is 1,900 - 2,500 (Adaptive Cylinder Control) and it can get MPG into the 30 - 33 mpg range. I tried it out on Blue Ridge Pkwy which is in my region.

with the gearing it cuts off ~ 63 mph in 6th gear, so at higher highway speeds ACC deactivates

its pretty smooth function every twenty seconds one bank shuts off, then the other - if you need more acceleration it goes back to all 6 cylinders until you're within the rpm range and lighter load (cruising)

 

Thanks for that info on cylinder deactivation, I’ve been curious about when/if it was working on my car. Is there any indication when it’s working?, does anything come up in the MFD to tell you it’s doing it? I’m away on biz, but when I get home I’ll be sure to do a steady state drive in the conditions you mentioned to see if I can feel it happening. Where I live, my steady state driving usually happens at speeds of 65 mph and above.

 

Didn't like (mom said never use the word hate) S/S, so I used the X431 to turn it off. By that I mean the X431 can set S/S to remain in last state. This means once one turns off the ignition, S/S will remain on or off the next time it is started, dependent upon whether it was on or off (respectively) when the ignition was turned off..

I programmed the S/S 'remember last state' function using the X431 over one year ago. Then I turned off the ignition with S/S off and I've never had to turn it off since. That said, I turn it on every 3 months or so as a quick and easy battery check. If it's still working, I know the battery is more than likely okay.

 

I programmed the S/S 'remember last state' function using the X431 over one year ago. Then I turned off the ignition with S/S off and I've never had to turn it off since. That said, I turn it on every 3 months or so as a quick and easy battery check. If it's still working, I know the battery is more than likely okay.

Same, good riddance, research says it saves gas, but not really.

Like you, I turn Auto Start Stop on infrequently, the best place I found to do this is on a drive thru line.

 

This was my first manual gear car with an auto start/stop. I found it very disconcerting to use when I got the car. You get the feeling you have stalled the car. I have not turned in on ever since.

 

Yes, 100% agree - same in my case. Other cars where I've had the feature have all been automatics - still don't like it in those cars, but nowhere near as disconcerting as it is in a car with a manual.

 

Personally I like the implementation and behavior in a manual-equipped car, and don't mind it at all. When toodling in traffic, I leave it enabled all the time. I like how I can "pre-start" the engine by simply pushing in the clutch a few moments before the light turns green.

 

So interesting. I have a completely opposite experience.... where I really like how it works in a manual. I love how I can put the car in neutral if I'm slowly approaching a stop and the engine will shut off before I even stop moving. Then, when I can clearly see that in a few seconds I'm going to need to start moving again, I press in the clutch and that immediately starts the engine even though I'm not quite yet ready to start moving forward. Then when the time comes, everything is ready to go. You can't really do that "pre-start" in a PDK-equipped car. I like that flexibility.

Anyway, it's not wrong to hate AS/S. I just find it interesting how much my perception/experience is different.

I haven't had any issues with battery problems in both my Cayman or my previous M2's AS/S.

 

what I learned with Auto S/S with PDK - in a loaner Macan, you let off the pedal where there's just enough to hold the vehicle (its very light pressure) and the engine will start. Also can do this when slowing to a light that just changed and you're slowing down, but not coming to a full stop as traffic is resuming motion

 

I also think the implementation is not that bad with the manual gearbox, but i keep it disabled by default as usually the traffic light is short for my usage (country side), I only enable it when i know that intersections in a big city have longer wait periods.

 

Understood. In my case, Whenever I know my stop will be short, I simply keep the clutch disengaged. That prevents the auto-stop.

 

That works too. But i try to be easier with the throw-out bearing and the ASS button can handle more abuse 🙂

 

Useful info here on ACC. As for ASS, I try to remember to turn it off on every start up, but, sometimes I forget and the engine shuts off when I don't expect it to or don't want it to, which can be dangerous at times. At other times, when I do want to use it, conditions haven't been met so it won't work. Grrr...

 

Hm.
It restarts so fast but I am no expert here, hardly ever used it.

 

ASS can save significant fuel on stop light to stop light traffic where you will be stationary for chunks of time. I saw a study on a Ford Fusion almost 20 years ago (if my memory isn't completely crap) where the benefit of fuel savings came after four seconds of being off; starting the car takes a bit more fuel than just idling. That said, I'm in sport + mode all the time and therefore never have ASS on.

 

I like to keep cars for 20 years or more. With the Boxster, probably until they put me in a pine box. So maybe I'm paranoid, but here's my gripe ...

The actual restart is a mechanical operation. Any such operation results in metal fatigue over time and use. Using ASS for 200,000 miles or more from now, is the starter motor going to need replacing? And just where is that motor in the very compact engine/transmission set up in a Boxster? is it one of those things that will require dropping the engine? The ASS feature is never going to save enough gas to pay for that.

Yours in happy paranoia,
Reid

 

My understanding is that the starter motor for cars that have AS/S are specifically beefed up for this extra duty.

The way I look at it is... the running of the engine is .... also a mechanical operation. As is shifting gears. As is the engagement and disengagement of fan motors. As is the up-and-down of windows. Brakes. Pumps. All kinds of things, really. All of these things involve metal and electrics and contacts and seals and actuators. It seems to me there's this curious singling out specifically for the starter motor in AS/S systems.

The other thing I find a bit interesting about these conversations is that for all these other systems, I usually see a quick defense: "excellent Porsche engineering means it's designed for it (whatever the "it" is)". The smart Porsche engineers have properly designed for load and wear and high-rpm and... etc etc. You get the idea.

But for AS/S, the argument is that it isn't properly engineered, that it will wear out prematurely. Or that it might. We can't be sure, so best be safe. But for literally the rest of the powertrain, that's not the case. Am I misreading things here?

 

I’m aure it was engineered properly. But both on my wife’s Cayenne and on my CGTS it is annoying. I would say on the CGTS it operates measurably better than the Cayenne. On the Cayenne it is way too aggressive/quick at shutting it down and can at times shut it down just as you are asking for power or during three point turns were it is particularly annoying. At least on the 718 it is a physical button, a turn of the dial or programmed out. On the Cayenne it is buried in a menu and can’t be programed out.

 

Just put the Cayenne in Sport Mode and it should turn off the A S/S feature. On my wife's '24 Macan it is still a physical button and it remembers last state so it is always in the off mode.

 

I see - that sounds annoying. I can see how with a PDK you lose some control. Plus no physical button also a minus.

With a manual (like mine) I essentially have absolute override control on the AS/S with the clutch pedal. I like that aspect.

 

Sport mode honestly is too aggressive for how my wife drives around town, which is most of her driving. Even I find it a bit aggressive for every day driving in an SUV. A last state feature would be nice. Of the three cars we have it is my least favorite car to drive by a significant margin. I much prefer my Mini Cooper SE for short around town duties. Quick, efficient, relatively light weight and handles decently.

 

I imagine it should be possible since we can do it on the 718. Probably just needs to be coded.

 

No one to my knowledge has figured out how to code it out. Some have tried but there isn’t nearly the fan base like the 718 making the level of effort that has been made to date.

 

Yes - I imagine the passion quotient for 718s is much higher than for Macans.

 

There is an additional very nice aspect to AS/S on a 6MT car. Regardless of driving mode or switch position for the AS/S button, if you stall the engine it will restart on its own as soon as you push the clutch in. For me that came in handy a couple of times when I was learning the nuances of the clutch release point and the engine response in the base Cayman 6MT.