Start/Stop Ignition explanation

[Macroni]

Can someone explain to me the benefit?

I loved it in my X5d (220hp) as it went unnoticed but hate it in my Turbo Panamera (550hp) in stop and go traffic it makes driving the car miserable. Can an engine be too powerful for it to be effective? I am beginning to think I will never use it again. Does it make the Panamera that much more efficient? Is it not a bit of an oxymoron; if you were concerned about such a gas savings would have you bought the Beast in the first place.

Pelican logic required......

[freeform911]

Helps manufacturers meet regulations...

I hate it in my Jaguar xfs but easy enough to disable it...only have to remember to do it everytime you get in the car...it can not be permanently disabled without unplugging wires..

[rwest]

Probably makes a difference at long stoplights, drive-thrus etc, especially when you multiple it by a bunch of cars.

I’ve never had or driven a vehicle with it and like many of us here have had cars that once you got it to start you just prayed it would stay running, so I suspect I would freak out each and every time it stopped and would wonder if it would restart!

[masraum]

does it make a huge difference to one car and one person's fuel bills, probably not unless they spend several hours a day commuting in stop and go, but then it's not really designed to help your pocket book. It's designed to help the planet.

[freeform911]

So...if your running a/c the car shuts down for a few minutes until the cabin temperature starts to creep up, then the car starts again to bring cabin temps back down...
Doesn't make to much sense but as stated its to try n cut co2 output...

[mepstein]

I had it on a ford pickup that I rented. The truck felt like it stalled at every intersection. There was a hesitation when I'd give it gas and then the gas pedal was depressed and the truck would jump forward. I hated it but it was just for a day.

[Macroni]

Originally Posted by mepstein

I had it on a ford pickup that I rented. The truck felt like it stalled at every intersection. There was a hesitation when I'd give it gas and then the gas pedal was depressed and the truck would jump forward. I hated it but it was just for a day.

exactly.....

[island911]

Originally Posted by masraum

does it make a huge difference to one car and one person's fuel bills, probably not unless they spend several hours a day commuting in stop and go, but then it's not really designed to help your pocket book. It's designed to help the planet. ...

No, freeform has it right; Helps manufacturers meet regulations..

There are no regulations on how long that machine needs to last. It certainly is not very "green" if the machine needs service more often, or worse yet, needs to be scrapped.

Example: Later model Saabs moved the cat closer and closer to the exhaust manifold. This was said to be 'green' as it got the cat up to operational temp's a few seconds quicker. (multiply x # of starts, x fleet size...) Just pay no attention to the fact that those turbo'd cars now had the cat sitting directly below the oil pan. This heated block of ceramic would carbonize/pryrolize the oil around the oil pump pick-up and starve the motor for oil. So, the car lasts 50k miles and is close to totalled. Yay, scrap-heap so Green But at least the placement helped manufacturers meet regulations..

[glewis80SC]

It in my wife's 2016 Cayenne and I hate it, like others said easy enough to turn off just wish it could be permanently turned deleted.

[eastbay]

I lol'd and pointed when I saw a newer 911 with ASS at a stoplight here recently. Pretty emasculating system for the driver.

[KNS]

The manufacturers want you to think they’re helping save the planet so you’ll love their cars. There are plenty of third world countries where the auto makers sell cars with far less emissions equipment simply because they don’t have to.

[wdfifteen]

Originally Posted by KNS

The manufacturers want you to think they’re helping save the planet so you’ll love their cars. There are plenty of third world countries where the auto makers sell cars with far less emissions equipment simply because they don’t have to.

So we should follow the 3rd world countries lead?

[rusnak]

Originally Posted by masraum

does it make a huge difference to one car and one person's fuel bills, probably not unless they spend several hours a day commuting in stop and go, but then it's not really designed to help your pocket book. It's designed to help the planet.

Totally spurious experiment. The little beaker is fuel to start a warm engine one time. The large one is fuel used idling an engine for 90 mins. A genuine exhibit would show almost the same amount of fuel in each, because the fuel needed to start an engine in 90 minutes of driving would be about the same as idling for 90 mins. In other words, you would multiply the small fuel sample by about 30 to 40 times. Their own experiment showed that starting and stopping saves about 8% fuel, but they are not doing a blind test and have skewed the results.

[rusnak]

Originally Posted by glewis80SC

It in my wife's 2016 Cayenne and I hate it, like others said easy enough to turn off just wish it could be permanently turned deleted.

That's probably why the Durametric Pro was invented.

[Macroni]

So @ 8% savings; 25,000 miles a year would save $540.xx of gas @ $4.00 per gallon..... assuming 15 MPG.

Thanks for input...... I won't use it anymore...... I can have it default to off.

[rcooled]

Originally Posted by rwest

I suspect I would freak out each and every time it stopped and would wonder if it would restart!

It wasn't all that long ago when vehicles would just refuse to start every now & then, or take quite a bit of cranking to fire up. In order for this stop/start technology to work, the vehicle needs to start instantly each and every time. IC engine technology has come a long way in the last few decades. That being said, I hate this feature too and disable it every time I drive a vehicle so equipped. As mentioned before, it's all about CAFE and CO emission standards.

[wilnj]

Originally Posted by mepstein

I had it on a ford pickup that I rented. The truck felt like it stalled at every intersection. There was a hesitation when I'd give it gas and then the gas pedal was depressed and the truck would jump forward. I hated it but it was just for a day.

That’s because you’re doing it wrong. The car will restart as soon as you ease pressure on the brake pedal, at least our Chrysler minivan does.

I anticipate the light changes or traffic so that the engine is running before I move my foot to the accelerator. A manual is even more intuitive.

I found it easier to learn how to use it rather than try to remember to turn it off every time.

When the A/C kicks it back on because you’re at a long light is a little annoying


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[Nickshu]

I think the conclusion was the car has to shut down for 7 minutes before this feature actually saves fuel.

https://youtu.be/V0Q31YeG8ac

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[aigel]

The old geezer is strong in this thread ...

I avoid city "driving" altogether and if I ever get a new enough car that is equipped with ASS, I'll just get used to it, because it will be an appliance. A 500 hp "Porsche" SUV has a lot more wrong with it than ASS IMHO.

G

[svandamme]

just turn it off
or don't put it in neutral (for manual) and then clutch in
or don't push your brake pedal to hard (for automatic) at stop lights , play with pedal so it things you wanna depart