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  #1  
Old 09-02-2012, 08:13 PM
geek84 geek84 is offline
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Default How do I change gears manually on my 2008 mercedes c class automatic?

Hi folks

I own a 2008 mercedes c class. As most of you may already be aware, it has automatic transmission. However, in the user guide it states that the owner has the option to shift gears manually. I have tried to follow the steps outlined in the guide and change gears manually, but I am getting slightly confused of the procedure to do this.

The procedure to do this described in the manual states that if you press the gear lever towards D+ then the automatic transmission shifts up one gear depending on the gear program selected. However, what does it mean by ‘depending on the gear program selected’, and how would I know what gear the car is in?

The manual goes on to say that shifting up a gear will extend the shift range but moving down a gear will restrict the shift range. What does it mean by extending and restricting the gear range?

Finally, will any of you folks be able to direct me to any websites ( or videos such as you tube), which explain the procedure for doing this?

Thanks in advance for your responses..
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  #2  
Old 09-02-2012, 08:30 PM
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television television is offline
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You have 2 driving modes, 1 in S and the other in C, by nudging the gear shift to the left it will change down 1 gear with every nudge, but the limits are as long as the speed of the car is suitable for that gear to be used,,, the gear change points are different when diving in S (standard mode) from driving in C (comfort mode)

Once again nudging the shift lever to the right it will change up, as long as the speed of the car is suitable for it to be in that gear
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  #3  
Old 09-02-2012, 08:44 PM
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When you nudge the gear shift left or right the display on the cluster screen which shows P R N D C/S changes to 1 2 3 4 5 to show what gear it is in. Should all be in the owners guide..
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  #4  
Old 09-02-2012, 09:10 PM
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turbopete turbopete is offline
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Or do it the simple way and actually just BUY a manual, if you want to change gear manually! Works fine for me!
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Old 09-02-2012, 10:23 PM
umblecumbuz umblecumbuz is offline
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This has come up previously.

As far as I understand it, tapping the Tiptronic selector once (up/down) will always change UP just one gear at a time (as long as the speed range is within limits), but will not necessarily change down just one gear at a time - it may change down MORE than one gear, depending on speed, current revs and load (ie - ascending/descending a hill).

So the selector cannot be used EXACTLY as a manual box could be used.

With earlier Tiptronic boxes (viz - my SLK 320) tapping either way selected just one gear higher or lower. Personally, I prefer this arrangement over the later boxes.

Having said all that, I am sure that someone will soon come along and put me right!

Baz
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  #6  
Old 09-02-2012, 10:57 PM
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whitenemesis whitenemesis is offline
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Evening!!

On my 203 if I tap left/right the 'box will always shift just one cog, if the speed/revs allow. If I push left and hold then it will drop as many cogs as needed to give optimum acceleration. Push and hold right and it removes the limit lock and goes to the gear best suited to the speed/revs
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Old 10-02-2012, 12:23 AM
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cleverdicky cleverdicky is offline
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Same as the practice of teaching driving to learners.
Old skool is to change down through the gears one at a time using engine braking in each gear.
This was because old cars just had a bit of wood that rubbed on the wheels when you wanted to slow or stop. And nowadays many drivers translate this to track driving.

In actual fact with modern cars, brakes are so much better and slowinging down through the gears will just add wear to modern lightweight transmisions. So its discouraged.
Instead 'block' changing is prefered in that once a driver slows to carry out the manouver, the correct gear is then selected (while still moving) to allow a swift and smooth drive off.

This is why there are so many accidents and rear end shunts at roundabouts.
The driver who doesnt block change goes down through all the gears to a stop usually, even if its safe to go and then its too late and hesitates.
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Old 10-02-2012, 08:21 AM
umblecumbuz umblecumbuz is offline
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Quote:
Originally Posted by cleverdicky View Post
... This is why there are so many accidents and rear end shunts at roundabouts.
The driver who doesnt block change goes down through all the gears to a stop usually, even if its safe to go and then its too late and hesitates.
One of the reasons for rear-end shunts at roundabouts seems to be that drivers approach them too fast, then realize this too late. Messing about changing down gears at the same time may be a factor also, but I am sure it is not the main one.

Who has never settled down to a main road (or motorway) speed only to find that they arrive at a turn-off or slipway going faster than they expected?

Baz
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  #9  
Old 10-02-2012, 11:30 AM
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obduro obduro is offline
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Well a combination of the two would be disastrous...arriving too fast then trying to slow down by going from 5th to 4th to 3rd to 2nd to CRUNCH
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Old 10-02-2012, 11:43 AM
wilsodg wilsodg is offline
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I did one of those 'defensive driving' courses (mandated by my employer for all high mileage emps.). The (ex-police) instructor coined the phrase "gears for going, brakes for slowing". Good advice I believe since modern brakes are more capable than the all-round drum brakes employed when using gears to slow the car was required to help with the load. He made the point that downshifting to assist braking just puts an imbalance into the design of the braking system and should be avoided. Maybe it helps if the cars brakes are very sharp ( I drove a Citroen once where the brakes were either on or off), but every merc I have driven is fine for gentle braking.
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