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Old 10-24-2012   #1 (permalink)
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Default Eco Mode

Morning

I have been wondering...is there a point where having the Eco stop/start function on actually becomes un-Eco or more importantly is damaging to the engine?

As an example, when driving inner city where there are plenty of hold ups, stops, starts etc the Eco mode can stop the engine and then have to restart it lots of times, and sometimes it's only off for a matter of seconds before we start moving again.

Does all the stop/start and short time between stopping and starting actually cause more harm than good?

Anyone any thoughts on this?

Thanks

Garf
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Old 10-24-2012   #2 (permalink)
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The first thing I do is switch ECO off. I don't find it works very well with a slight shudder on restart. I also do like the thought of the engine/starter keep switching on /off.
It shouldn't really bother me, as we will only keep the car for a couple of years, but I have a fair amount of mechanical sympathy.
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Old 10-24-2012   #3 (permalink)
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I've wondered about the ECO function, too. And not just in terms of efficiency, but also in terms of motor wear. I assume MB took this into consideration when they designed the system, but 'back in the day', it was considered 'common knowledge' that the most wear on an engine occured at startup - mainly because the oil pressure took a second or two to build up. Maybe that logic only applies to the 'initial' or 'cold' startup, and not intermittent starting/stopping after warm-up the way ECO functions - it could be that there's enough of an oil film on all of the wear surfaces that a short start/stop cycle won't do any harm? Also, in the AMG, MB supposedly limits the performance until the oil temp reaches 176 F, so they've probably taken these oil pressure fluctuations into account. For now, I'll assume that MB has ECO figured out and my engine won't be any worse for wear when it's active, but I may change my thinking and just turn it off every time I take the car out.
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Old 10-24-2012   #4 (permalink)
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Yes.Years ago it was about 75% of engine wear was caused from cold starts. I think modern oils have pretty much taken care of the, although obviously most engine wear is from cold. For me it's all the other things connected with stop/start. Each time the engine restarts and backlash is taken up and in the case of the SLK with automatic handbrake release, this immediately transfers to the drive train. It's interesting the with the AMG cars, you can set it not to default to on each time you climb in. I'd like that on my car.
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Old 10-24-2012   #5 (permalink)
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IMVHO (a very personal view).. Car manufacturer need to meet the ever more strict environmental commitment set by different countries in order to sell their cars in those countries. If the Eco system can help put their cars into the markets, lets worry about the long term reliability issue later. If they can't even sell the car it is game over.
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Old 10-24-2012   #6 (permalink)
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doesn't bother me, i have a warranty and only plan on keeping the car for 3 years anyway.

Im sure they've done their research and wouldn't add a feature to the car that would damage it, especially on an expensive AMG engine. It doesn't use the feature for the first few minutes as it shows inactive, so I'm guessing this is something to do with making sure the engine is at least warm enough to make it a non-issue.

on fifth gear this week (UK car show) they tested the stop start on a renault and it gave 20% extra distance from the same amount of petrol when driving around central london/birmingham (not sure which, but it was a big city).

I keep it on, even on an AMG......
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Old 10-24-2012   #7 (permalink)
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Well eventually these cars will be passed on in the years and thats when the faults arrise .
Ie costly starter motor !
Battery wear !
As more and more demands on the battery are put on these .
Thats when there start /stop are switched off.

Im all for better fuel economy but when the bill comes in to repair the start / stop technology ooouuuccchhh !!
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Old 11-02-2012   #8 (permalink)
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If I stop the engine manually and then start it again manually, does that have the same effect as the eco start stop or is the eco functioning differently?
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Old 11-02-2012   #9 (permalink)
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Quote:
Originally Posted by jgonz2513 View Post
If I stop the engine manually and then start it again manually, does that have the same effect as the eco start stop or is the eco functioning differently?
As far as I am aware the starter motors are different.

They are designed to handle frequent use.

I think the engine management system also remembers the position of each piston, and fires up the best positioned one first for quick startup's
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Old 11-02-2012   #10 (permalink)
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When the engine stops in ECO mode, all the ancillaries continue to work, which doesn't happen if you just turn off the engine.
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Old 11-03-2012   #11 (permalink)
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Quote:
Originally Posted by jgonz2513 View Post
If I stop the engine manually and then start it again manually, does that have the same effect as the eco start stop or is the eco functioning differently?
mj01 is right. Most importantly the auto transmission has an oil pump that continues to operate when the engine turns itself off.
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Old 11-03-2012   #12 (permalink)
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Post ECO Mode in 55 AMG

Question for this thread...

I just took delivery of a SLK55 AMG, currently going through the break-in period.

I've noticed the Start/Stop function begins to activate literally right out of the garage, before the motor could possibly be at the correct operating temperature

Is this normal?

Given the complex logic the system uses to activate the function, it seems odd that only one trigger for the system wouldn't work.

Any insights would be appreciated!

Thanks,
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Old 11-03-2012   #13 (permalink)
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Old 11-03-2012   #14 (permalink)
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Quote:
Originally Posted by mrob-1991 View Post
Question for this thread...

I just took delivery of a SLK55 AMG, currently going through the break-in period.

I've noticed the Start/Stop function begins to activate literally right out of the garage, before the motor could possibly be at the correct operating temperature

Is this normal?

Given the complex logic the system uses to activate the function, it seems odd that only one trigger for the system wouldn't work.

Any insights would be appreciated!

Thanks,
I don't know what the requirements are, but mine seems to start working at varying distances from home, sometimes I get to the end of the street and stop and it comes on, other times it takes 5-10 mins, not sure whether its to do with engine temperature, whether you have the heating/aircon on etc.

Sorry.
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