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Auto Stop/Start impact on 2.0d motor
09-05-2018, 08:17 AM
Post: #1
Auto Stop/Start impact on 2.0d motor
Hi All,

Apologies if this topic has been discussed before.

As this is my first tractor, I am concerned with the impact that frequent auto stop/start has on the diesel motor.

Old school turbo thinking is to always cool down your turbo for a minute before switching off.

I know that some may say that the CPU is smart enough to know when to momentarily disable the stop/start feature, if the motor/turbo is too hot.

However, we all know that modern German cars are built to only truly last 7 years/200,000km (the maximum extension allowed on Motorplan), so the tolerances on mechanical longevity are not as tight as those on your Japanese vehicles. As a case in point, my CX5 petrol seems to be reluctant to auto stop/start itself, unless the conditions are just perfect (it seems to also be impacted by the weather!).

So, what do other BMW diesel owners do, in particular, those with auto stop/start features? Is it better to just switch this feature off every time you start the car and forgo the incremental fuel saving benefit for peace of mind of mechanical longevity?
I guess if you replace your car every 5 years or less, then this would matter less to you.

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MiteshN
09-05-2018, 08:19 AM
Post: #2
RE: Auto Stop/Start impact on 2.0d motor
I had mine coded so that the auto stop start function is disabled unless i manually enable it.
I dont see the point of it, i cannot be convinced that it will greatly reduce emmisions etc.

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09-05-2018, 09:06 AM
Post: #3
RE: Auto Stop/Start impact on 2.0d motor
(09-05-2018 08:19 AM)M135i Wrote:  I had mine coded so that the auto stop start function is disabled unless i manually enable it.
I dont see the point of it, i cannot be convinced that it will greatly reduce emmisions etc.

I have done the same Thumbs

However on the Diesel I have noticed that in really hectic treaffic, like I mean if you stand at a robot for several minutes on idle, it does have a slight impact. But not sure if its good for the turbo or not to be honest.

However it irritates me, hence why I coded it. So I only use it when in town which is very rare.

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09-05-2018, 10:13 AM
Post: #4
RE: Auto Stop/Start impact on 2.0d motor
I have a button next to start button on my 2011 X3 which allows me to disable the "stop start pest", hate this function, so when I start her that is the first thing I do is disable this "unnecessary" function by way of this button Fencelook

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MR_Y
09-05-2018, 11:12 AM
Post: #5
RE: Auto Stop/Start impact on 2.0d motor
Thanks for the feedback guys.

On a side note, the 2.0d motor in the F30 LCI is pretty rough/shaky on idle and startup. I noticed that the same motor (140kw/400Nm) in the new 520d does not feel like this. I assume it is more to do with the insulation and padding in the 5-series being thicker than the 3-series?

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Current: 2017 320d M-Sport Sports Auto
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09-05-2018, 11:15 AM
Post: #6
RE: Auto Stop/Start impact on 2.0d motor
I assume its only that way on cold startup - normal.
But once it is up to temperature it shouldnt really shake too much on startup again.

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MR_Y
09-05-2018, 12:14 PM
Post: #7
RE: Auto Stop/Start impact on 2.0d motor
Code it out and never use it.

Did it on my AUDI and never looked back. I cannot personally say I see the benefits of it and I am not one that is truly bothered by environmental whats what

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09-05-2018, 01:45 PM
Post: #8
RE: Auto Stop/Start impact on 2.0d motor
I cant imagine this is good for the engine when cold.

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09-05-2018, 01:57 PM
Post: #9
RE: Auto Stop/Start impact on 2.0d motor
(09-05-2018 01:45 PM)tman Wrote:  I cant imagine this is good for the engine when cold.

It's only supposed to work when it's reached operating temperatures.

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09-05-2018, 02:12 PM
Post: #10
RE: Auto Stop/Start impact on 2.0d motor
I think there are benefits, fuel savings, if i compared the fuel consumption while standing at a robot, multiplied by the number of robots, everyday....

If you dont want to use, code it out, but if you were driving the car hard, hopefully you are in sport mode as stop start wont work in sport mode.

Also if you get used to it, you can stop without getting it to switch off in drive.

I wish my E60 had it.

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09-05-2018, 02:46 PM (This post was last modified: 09-05-2018 02:46 PM by cotzo.)
Post: #11
RE: Auto Stop/Start impact on 2.0d motor
I personally use it a lot especially in traffic from pta ======> midrand and back everyday. I notice the difference.

But if you don't like it code it out like the advise from the guys.

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09-05-2018, 02:54 PM
Post: #12
RE: Auto Stop/Start impact on 2.0d motor
Coded mine to remember last setting so if i turn it off it stays off until i press the button to activate it again.

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jacqueh
09-05-2018, 04:21 PM
Post: #13
Auto Stop/Start impact on 2.0d motor
What i have heard is that the turbo should be fine since the oil cooling to the turbo is electronic instead of engine reliant.

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09-05-2018, 09:08 PM
Post: #14
RE: Auto Stop/Start impact on 2.0d motor
your car should be fine for 5 years / 120k km dunno anymore

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10-05-2018, 08:50 AM
Post: #15
RE: Auto Stop/Start impact on 2.0d motor
I don't like this function.
I imagine this invention is to please emission and environmental quotas over the mechanical health of a car.
Im not an expert but does an engine not also get slightly hotter before cooling down after being switched off?
I think there would be an optimum waiting time when this is a good thing, but 20 seconds does not warrant cutting the engine in my opinion, mabe 5 mins. but again im not an expert.
I ride a bike mostly, and when this function started appearing it was strange to hear all the cars around me start up before moving off.
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10-05-2018, 09:11 AM
Post: #16
RE: Auto Stop/Start impact on 2.0d motor
(09-05-2018 08:17 AM)MR_Y Wrote:  Hi All,

Apologies if this topic has been discussed before.

As this is my first tractor, I am concerned with the impact that frequent auto stop/start has on the diesel motor.

Old school turbo thinking is to always cool down your turbo for a minute before switching off.

I know that some may say that the CPU is smart enough to know when to momentarily disable the stop/start feature, if the motor/turbo is too hot.

However, we all know that modern German cars are built to only truly last 7 years/200,000km (the maximum extension allowed on Motorplan), so the tolerances on mechanical longevity are not as tight as those on your Japanese vehicles. As a case in point, my CX5 petrol seems to be reluctant to auto stop/start itself, unless the conditions are just perfect (it seems to also be impacted by the weather!).

So, what do other BMW diesel owners do, in particular, those with auto stop/start features? Is it better to just switch this feature off every time you start the car and forgo the incremental fuel saving benefit for peace of mind of mechanical longevity?
I guess if you replace your car every 5 years or less, then this would matter less to you.

Personally, I do not think its a fuel saver. With that said, I do not turn it off.
If BMW has this feature, I would like to think they have thought about your concerns.

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10-05-2018, 02:57 PM
Post: #17
RE: Auto Stop/Start impact on 2.0d motor
(10-05-2018 09:11 AM)r0ckf1re Wrote:  Personally, I do not think its a fuel saver. With that said, I do not turn it off.
If BMW has this feature, I would like to think they have thought about your concerns.

I tried this on the X1, not a long drive, a daily commute and there was a noticeable difference, about 0.3L/100km better with it on.

If my wife would drive my car more, i would be able to check on a tank, but that wont be happening.

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10-05-2018, 04:05 PM (This post was last modified: 10-05-2018 04:05 PM by M135i.)
Post: #18
RE: Auto Stop/Start impact on 2.0d motor
It not worth the extra strain on your starter motor and related.

Current:
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SO:
320d F30 MSport Alpine White 8sp A/T
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Honda Civic Type R FN2 NHB


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MR_Y
10-05-2018, 05:19 PM
Post: #19
RE: Auto Stop/Start impact on 2.0d motor
battery also

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10-05-2018, 06:15 PM
Post: #20
RE: Auto Stop/Start impact on 2.0d motor
I know that this topic relates to a lot of personal opinions but you guys should go bisit Munich and see those taxis that are over 600k km and stop start at every intersection or stop, speaking to the drivers they will tell you that those cars run without any problem. The starters and engines were designed to stop at a stage were it does not take much to start, so the strain is actually minimal if the design was made to do it.

Each to his own though, i cannot say that I enjoy it either...Thumbs

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