Auto Start Stop = Extra Wear and Tear?

[M4UK]

Originally Posted by Blksnowflake

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.

BMW put it in because they have to nod to the emissions regulations.

[Damasconian]

At least you can turn off the start/stop feature. Turing off the A/C every time you get into the car must take a toll (however small). That can't be changed so we're stuck with it.

[SMURFDADDY]

Originally Posted by Richy Rich

Is this an increase from what you see without?

About 1.5MPG average. I've mostly been eyeing the fuel gauge which seems to be decreasing at a slower rate....

Again. The savings aren't tremendous, but the system is FAR less intrusive and much more refined than any start/stop that I've used. Mainly from the DCT trans as opposed to a car equipped with an automatic + torque converter.

I suggest you guys at least give it a shot for a full tank of gas and judge for yourselves.

[Kevlar]

Originally Posted by SMURFDADDY

About 1.5MPG average. I've mostly been eyeing the fuel gauge which seems to be decreasing at a slower rate....

Again. The savings aren't tremendous, but the system is FAR less intrusive and much more refined than any start/stop that I've used. Mainly from the DCT trans as opposed to a car equipped with an automatic + torque converter.

I suggest you guys at least give it a shot for a full tank of gas and judge for yourselves.

The best way is to zero out the trip counter when you fill up... this way you will see how far you can go with the system enabled vs. disabled.

[karussell]

used it for 3 years on last m3. use it all the time on the m4. came in handy in jacksonville, daytona, and miami this weekend. i use it because its time its not spitting out emissions for no good reason. and it saves some fuel. nothing wrong with that.
the additional wear on the engine would likely be not even measurable. The system doesn't work when the engine is cold. once its warmed up everything is all lubed well. the starter is heavy duty designed for repeated duty. just about everyone in europe uses it and i haven't seen a massive recall on starters or engines blowing up left and right over the past 5 years so i'm guessing its okay to use.

and you can be an enthusiast and use it. and you can have a sports car and still care about emissions. someone tell me i'm not using my own car the right way and should get something more appropriate gets absolutely zero F's from me.

[crypticc]

Hi. My dad used to work for a major electrical motor manufacturer. Big ones. Power generators etc. He looked after beating tolerances etc.
After that he worked for lotus.

First time I took him for a drive in my e92 and it stopped at the lights he couldn't believe it. We had the same discussion about hot oil, oil in the head, and coating the crank, etc. His point was that was guff! When running the bearings float on a film of oil constantly drawn through the bearing as it rotates and when stopped the bearing then squeezes out that film... Something about 99 % of bearing wear is during stopping and stating and doesn't matter whether it is hot or cold...previously running or not.

I wonder if the e9x bearing issues are due to the now famous stop and start and now whether f8x is next in the line for bearing issues.
It would be interesting to know if those who had e9x bearing issues tended to live in cities or have commute with stop start traffic along the way.

[SMURFDADDY]

Originally Posted by Kevlar

The best way is to zero out the trip counter when you fill up... this way you will see how far you can go with the system enabled vs. disabled.

I actually prefer using it. Neat feature

[dhoggm3]

I actually like this silly little feature. Passengers are convinced the car has stalled. That's fun.

[Vectors2final]

Originally Posted by Kevlar

The best way is to zero out the trip counter when you fill up... this way you will see how far you can go with the system enabled vs. disabled.

Pretty easy habit for me as I try to match up the computers MPG vs. Calculated MPG.

I'll definitely will be trying out the differences, but it will be really hard to keep the foot out of it for a real reading.

[Kevlar]

What were the results?

[Vectors2final]

Unfortunately, my car is still waiting for a boat. It's almost been a month.

Plus, it will be sitting in my garage till June. I'll surely calculate it then.

[SL%%]

time will only tell friend... not enough info as of the moment...

[cxbaba]

any info now that 3 years has passed

[Aaaaaaaaa]

Originally Posted by Railgun

It's not a fuel saver in the strictest sense. It's an emissions thing. 25k/30mo on mine and it's fine.

Bring on the bullshit excuses for not using it.

I drive in Sport+ DSC off 100% of the time? :

[bmrwrld]

I hate that button, It's to close to start / stop button that some times I accidentally activate it. Needs to be seperate and in a different location.

[uniqueMR]

Originally Posted by pheerIx

I drive in Sport+ DSC off 100% of the time? :

[Fast4d]

I had to replace the starter on my 90k mile E90. how long do you think starter will last if it's used 10-20 times a day?

stop/start disabled in both my M3 and wife's car.

[GnoiXiaK]

Originally Posted by dhoggm3

I actually like this silly little feature. Passengers are convinced the car has stalled. That's fun.

Terrifies me if I turn it on accidentally. I always think I've stalled. It's the weirdest sensation in a MT. It's not worth the mini heart attacks. As a creature of habit, I've never gotten used to it

[gatorfast]

It's a horrible feature. I honestly don't know how anyone can tolerate it.

[drgmt]

Given that global warming/climate change is a scam - I don't understand any of this emissions nonsense. Further I couldn't give a crap about the size of my "footprint".

The first thing I did was code of the ASS. Felt good.

[teemolovesm4]

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?

Yeah mine is always off and it definitely kills your engine faster. Good thing is that we don't need to turn it off every time we start the car. On my B9 Audi A4, I have to turn it off every time I start the car. My friend's Mercedes glc300 insists to leave the feature on lol. It turns back on during the drive after a few mins u turn it off :

[420Coupe]

Originally Posted by Railgun

Genius...guess what...self absorbed thinking is the exact problem.

Now, I don't know where you are exactly, but let's take London as an example, where traffic is utter shit and you can get through town at a good average of about 13mph. Stop and go traffic is shit for emissions. And London's air quality is apparently pretty crap. Now, if you think just a little bit...if EVERYONE had this feature and used it, guess how many cars no longer sit idling away in traffic.

But keep thinking of no one but yourself.

I love that no one can give a single ounce of legitimate reasoning for turning it off. You guys are a special breed.

Does anyone really need any legitimate reason to do anything to their car?

we could argue legitimacy for any modification done; at the end of the day it's your car do with it as you please.