Auto Start Stop = Extra Wear and Tear?

[sunnyboy]

Ok, quick question (and not sure maybe someone else already asked)... is the auto start-stop function good for the car (M3/4)? Also, should this be enable during break-in period?

I mean, the constant starting and stopping of the engine cannot be good for the engine? yes? no? thoughts?

[Lups]

Originally Posted by sunnyboy

Ok, quick question (and not sure maybe someone else already asked)... is the auto start-stop function good for the car (M3/4)? Also, should this be enable during break-in period?

I mean, the constant starting and stopping of the engine cannot be good for the engine? yes? no? thoughts?

Here is an answer from the wrong side of the border: NEver ever let it be on. It is seriously the biggest kill joy of all times, and the kill the start stop button is my best friend.

Forget all about it, press it once to shut it up, never touch it again.

[Nex]

Originally Posted by Lups

Here is an answer from the wrong side of the border: NEver ever let it be on. It is seriously the biggest kill joy of all times, and the kill the start stop button is my best friend.

Forget all about it, press it once to shut it up, never touch it again.

+1. First thing I did when I got the car.

[Lups]

Originally Posted by Nex

+1. First thing I did when I got the car.

Same here, accidentally I've activated a few times after that, and heart attack is the result every time. I never remember where the bloody button is when the tine of this huge crises is.

[E92LNGCGY]

I've been experimenting with this function. Yes it is very annoying and I don't think it's good for the starter motor, most likely need replacing much quicker. But the system does work as in save fuel. I was able to get about 30 kms more out of the tank. I would consider myself a spirited driver and 100% city driving.

[Kuwen]

I find it pairs pretty well with the MT; I like it much more in my car than my wife's (auto) X3.

[farbmw]

Originally Posted by Kuwen

I find it pairs pretty well with the MT; I like it much more in my car than my wife's (auto) X3.

+1 and in an manual car you don't need to find the off/on button for it, just leave you foot on the clutch when you don't want it to activate.

[Blksnowflake]

Sorry if this has been brought up, I searched and didn't see anything.
Does the ASS cause any extra wear on the starter or engine?

Didn't really consider it an issue until my wife mentioned it and got me thinking that the engine is cranking up and whether over the long haul I may save fuel but beat up my ignition or wear out my engine more from the repeated turn overs.

Or does this system work different than normally turning the engine on? Is it some form of cylinder deactivation and not ignition?

Thanks.

[Lups]

Who cares since all of us have turned it off.

[M6-Coupe]

Originally Posted by Lups

Who cares since all of us have turned it off.

LOL. I think I have to turn it on at traffic light when I see you there staring at red light waiting to be green ... I know, I know,... I have to lose

[GrussGott]

Originally Posted by Lups

Who cares since all of us have turned it off.

What's "start-stop"? Hey, scientists, do you know what auto start-stop is?



I guess nobody knows.

[Blksnowflake]

Thank you for your informative responses, but I care. Traffic can be horrible in Houston and this may save fuel and prevent the cooling system from working extra hard in the summer months.

[gblansten]

The parts for the ASS system (love that acronym) have been upgraded to accommodate the extra wear and tear.

[Lups]

Originally Posted by M6-Coupe

LOL. I think I have to turn it on at traffic light when I see you there staring at red light waiting to be green ... I know, I know,... I have to lose

Bahahaha, we really need to do this epic race man!

I have accidentally put it on twice, and on both times it has freaked me out to the point I've called @wah screaming for him to tell me how to shut it off.

Yeah, engine dying at lights is my biggest nightmare after my fathers nasty habbit of leaving cars without petrol, and me pushing THEIR HORRIBLE Citroen out of a crossroad while cussing and dreaming of a beer I could drink in 8 weeks.

Put in petrol if you sent an extremely pregnant family member running your errands.

Kill start and stop, except when Coupe and I are racing.

[Lups]

Originally Posted by Blksnowflake

Thank you for your informative responses, but I care. Traffic can be horrible in Houston and this may save fuel and prevent the cooling system from working extra hard in the summer months.

Dude I've been a dick all day due to lack of sleep. Here is a better answer.

I can not stand hypocrisy with environmental issues, and a start and stop is the worst of these, if we don't count priuses. If one drives within reason, you can do better than a start and stop, and if environment is your main concern, I can hand out hundreds of tiny and not life changing tips of ways you too can make life better for all of us.

What I will not do is think about anyone's engine wearing down by using this invention from hell for fuel economy.

[GrussGott]

Originally Posted by Blksnowflake

Thank you for your informative responses, but I care.

Then you should probably buy a different car.

There's absolutely no doubt that cycling anything causes more wear & tear on it, whether it's a light switch, an airplane, or your car. If you're concerned about fuel cost, then this is DEFINITELY the wrong car for you. As for preventing the cooling system from working hard ... again, if these are your concerns then the M4 isn't for you.

Of course just my 2 cents, but shut your ASS off and enjoy the M4 or buy a car that's built for and to your concerns. (that sounds harsher than I mean it to, but the acronym invites excuses to use it)

[Blksnowflake]

My concern has nothing to do with the environment.

I get it, you don't care. You don't have to worry about my engine, that's my job which is why I'm inquiring.

[Lups]

Originally Posted by Blksnowflake

My concern has nothing to do with the environment.

I get it, you don't care. You don't have to worry about my engine, that's my job which is why I'm inquiring.

Do not get us wrong, we care about engines. I just think you care for the wrong reason in my view.

[Blksnowflake]

Originally Posted by GrussGott

Then you should probably buy a different car.

There's absolutely no doubt that cycling anything causes more wear & tear on it, whether it's a light switch, an airplane, or your car. If you're concerned about fuel cost, then this is DEFINITELY the wrong car for you. As for preventing the cooling system from working hard ... again, if these are your concerns then the M4 isn't for you.

Of course just my 2 cents, but shut your ASS off and enjoy the M4 or buy a car that's built for and to your concerns. (that sounds harsher than I mean it to, but the acronym invites excuses to use it)

Thank you. This isn't my first performance vehicle and I didnt buy it for fuel economy. I don't get why the default answer is always "get another car". The feature may or may not be useful to some, just like the other twenty or so features that this luxury vehicle has that have nothing to do with performance. If I wanted a stripped down track car, I can think of better less expensive options. BMW put it in for a reason and if you're an engineer of some sort and are here to inform me that the system is useless because xyz, then thank you and if it does wear components then there are cons, but as some one mentioned, the system has been made more durable to support the repeated ignitions.

That's all I needed to know.
To be honest, I've put 600 plus miles on my car in about a week and half since I bought the car and haven't used it. Personally, I just want to know my car, I plan on keeping this one.

[2000cs]

I don't think ASS has been available/standard long enough to really judge this or answer your question. I like to think BMW, Mercedes and the others have done their research, but I don't know. Perhaps it has been available in other markets (europe or Japan?) for enough experience to give a valid answer, but I haven't seen any of that shared. So you can either trust the manufacturers to have done it right, or ??? (I would assume the relevant components are matched to the design life of the vehicle, which is probably somewhere between 100,000 and 200,000 miles.)

I used it all the time on the Mercedes I traded for my M3, and haven't turned it on yet for the BMW. And I probably never will.

[Racer20]

Apparently wasting gas for no reason is what all the cool kids are doing these days. OP, I leave mine on. That said, it only activates about half the time. There are quite a few parameters that the car uses to determine whether or not to turn the car off . . . the electrical demands, battery voltage, engine temp, climate control demands, etc. Mine only activates about half the time even when it's on.

Further, designing the components to survive the extra duty cycles is not necessarily child's play, but it's not rocket science either. The car, and ASS system is tested to the same lifetime requirements that a non-ASS car is. Don't worry about it.

The mindset that people who buy M3's or other sports cars shouldn't care whatsoever about fuel economy is ridiculous. Fuel economy is not a primary factor in my buying decision, nor does it make a difference to my finances, but at the same time, being wasteful on purpose is just irresponsible.

[GrussGott]

Originally Posted by Blksnowflake

BMW put it in for a reason

I think the primary reason is to increase reported city MPG to pass CAFE standards ... there's a fuel efficiency meter you can turn on in the dash too