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Discussion Starter #1
I have a new automatic C220cdi coupe and the manual mentions shift ranges but only says shift ranges 1 to 3 exist even though the auto has 7 gears, so if driving at speed in 'D' and pull the left hand paddle (D-) that would take me from say 6 to 5 so I do not understand why only 1 to 3 are listed?
Is it saying that when I start to do a downhill journey I should keep pulling the paddel D- until I see a 1, 2 or 3 in the multifunction display? and because I used the paddle that the car will not go above that gear but can go down?
And if so, I would have thought that this would happen in any gear not just the first 3.

In other words is the 'shift range' different to the drive gear? so in D, then a single D- operation would give me 5 in the display not a 1,2 or 3 and if so where do I see the 1,2 or 3?
 

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Are not these examples rather than fact, with the paddle you can down shift and up shift within the range according to the car speed. I have no such wording in my CL book and its the same box. The car will auto change down to a lower gear when going down hills, but why you would need to down shift further is beyond me
 

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Zotye Auto 1.5T T600 2016
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I am no expert on this and I have not read the manual but I suspect the padels only operate in 1 2 and 3rd gear?? I think I will download and read this manual. What year is the car?
 

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I am no expert on this and I have not read the manual but I suspect the padels only operate in 1 2 and 3rd gear?? I think I will download and read this manual. What year is the car?
Why should they, our 204 cars in the uk shift on all, no point in having them if they only worked on the first few gears. Say I am driving at 60 and want to overtake, I use the paddles, that is what they are for
 

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Zotye Auto 1.5T T600 2016
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Why should they, our 204 cars in the uk shift on all, no point in having them if they only worked on the first few gears. Say I am driving at 60 and want to overtake, I use the paddles, that is what they are for
That is what kick down is for. But hey I am really not sure about this 123 bit, have not read the manual this man is talking about yet.
 

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Zotye Auto 1.5T T600 2016
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It is a 2012 model UK car.

The shift range is in the printed manual and online, under driving and parking then automatic transmission then shift ranges
Interactive Owner's Manual [c204]
I see what you are talking about now, this is simply to use the transmission as a brake when traveling downhill, it gives you a manual style shift brake effect.
 

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That is what kick down is for. But hey I am really not sure about this 123 bit, have not read the manual this man is talking about yet.
It is not, with the paddle shift you do not have to waste fuel by Kicking down, plus you can only kick down when the time is right. With paddle shift you can drop down a gear or two while waiting for a time to overtake.

I personally do not like using the engine in reverse thrust, not good on the pistons and bores, brakes are much cheaper to use unless you have such a steep hill there would be a risk of the brakes overheating.
 

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It is not, with the paddle shift you do not have to waste fuel by Kicking down, plus you can only kick down when the time is right. With paddle shift you can drop down a gear or two while waiting for a time to overtake.

I personally do not like using the engine in reverse thrust, not good on the pistons and bores, brakes are much cheaper to use unless you have such a steep hill there would be a risk of the brakes overheating.
Read post 7. And I agree using the shift as a brake or dropping into a lower gear whilst waiting to pass does not help the engine any.
 

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Read post 7. And I agree using the shift as a brake or dropping into a lower gear whilst waiting to pass does not help the engine any.


That is not what I said, no harm in dropping down when waiting to overtake, I just do not like engine braking to much, a very different thing
 

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Discussion Starter #11
I still do not understand why it only refers to gears 1-3 what about 4 to 7 the concept of shift range is still there isn't it? and by shift range I think MB means that rather than a range you are setting the highest gear possible unless under kickdown etc.?
 

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I still do not understand why it only refers to gears 1-3 what about 4 to 7 the concept of shift range is still there isn't it? and by shift range I think MB means that rather than a range you are setting the highest gear possible unless under kickdown etc.?
Yes everything is still there, just drive the car normally, if you need to do a quick overtake, just pull the left hand paddle and it will change down a gear each time you pull it even when you are in top gear or any other gear.

All of that in the hand book was for engine braking on long descents, you do not have to do anything, just drive and brake if you feel that you need to
 

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I still do not understand why it only refers to gears 1-3 what about 4 to 7 the concept of shift range is still there isn't it? and by shift range I think MB means that rather than a range you are setting the highest gear possible unless under kickdown etc.?
The section you are reading is about using the transmission as a brake, ie 321 in gears higher than this there is no braking effect. Lets say you are in the alps and moving down a very steep gradient the transmission will shift up through the gears even with foot off throttle, so with the paddle you can drop it into a lower gear and use it as a brake to slow the car down.
 

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2004 CLK 240 Coupe
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In other words is the 'shift range' different to the drive gear? so in D, then a single D- operation would give me 5 in the display not a 1,2 or 3 and if so where do I see the 1,2 or 3?
I think that the terminology might be confusing you here.. This is my understanding - and Eric will correct me if I have got it wrong...:)

The 722.9 transmission has 7 forward gears + 2 reverse, by use of the C/S mode selector. These gears are not indicated on the multifunction display - only P, N, R and D are shown, plus the mode selected.

Additionally, the (speed) range of the forward gears can be limited or extended in three stages, 1, 2, 3. This is done in D, either by use of the 'one-touch' facility on the shift lever (D+, D-) or the switches on the steering wheel (left = limit range, right = extend range). This range is displayed in the multifunction display where 1, 2 or 3 replaces D.

The feature is intended to allow the transmission to provide engine braking at various degrees with 1 being minimum, and 3 being maximum, which is reserved for extreme gradients.
 

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I think that the terminology might be confusing you here.. This is my understanding - and Eric will correct me if I have got it wrong...:)

The 722.9 transmission has 7 forward gears + 2 reverse, by use of the C/S mode selector. These gears are not indicated on the multifunction display - only P, N, R and D are shown, plus the mode selected.

Additionally, the (speed) range of the forward gears can be limited or extended in three stages, 1, 2, 3. This is done in D, either by use of the 'one-touch' facility on the shift lever (D+, D-) or the switches on the steering wheel (left = limit range, right = extend range). This range is displayed in the multifunction display where 1, 2 or 3 replaces D.

The feature is intended to allow the transmission to provide engine braking at various degrees with 1 being minimum, and 3 being maximum, which is reserved for extreme gradients.
The gears you select by using the paddles are shown on the 7g box in the display
 

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Discussion Starter #16
I am actually going for a good trip over the alps later this year, hence the question as there are lots of steep downhills and my initial interpretation of the manual is that the 3 possible shift range values (1-3) are nothing to do with the gear number else they would be 1-7. My car has 3 modes econ/sport/manual which is shown differently to D and when I pull a paddle then the number (1-7) is displayed.

The transmissions shows the numbers 1 to 7 if I pull the paddles, so the concept of a shift gear range limit of 1-3 does not seem to exist in the display, but it does display the current gear (1-7).
So from all these replies, my understanding is that in the MB transmission system if you put youself in gear 1, 2 or 3 (by the gear number, no 'shift range' option/display) then these have extra capabilities meaning to limit the car from over speeding/revving/progressing through the gears, whereas gears 4-7 will allow the car to keep accelerating as I descend the hills and thus changing up gears.
 

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Additionally, the (speed) range of the forward gears can be limited or extended in three stages, 1, 2, 3. This is done in D, either by use of the 'one-touch' facility on the shift lever (D+, D-) or the switches on the steering wheel (left = limit range, right = extend range). This range is displayed in the multifunction display where 1, 2 or 3 replaces D.

The feature is intended to allow the transmission to provide engine braking at various degrees with 1 being minimum, and 3 being maximum, which is reserved for extreme gradients.
If I understood correctly the above, I don't think that is right.

The transmission works like television explains. The manual however is pretty confusing in my opinion. It does explain the transmission operation and the option to limit gear ranges to anything from 1 to 6 down to 1 to 2 or the first gear only but the example of three stages of engine braking is not good, people do seem to interpret it as if engine braking was only possible with these three options while equally well you can select max gear 4, it would just mean engine braking at an even higher speed.

Attached another document explaining how the transmission works with shift ranges. If you read it carefully, you should conclude the same as the on-line user manual while just ignoring that confusing section about three different ranges of engine braking power (the rest of the manual already explains how the tranny works with any restricted gear selection range).
 

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If I understood correctly the above, I don't think that is right.
You are correct - I now accept that my post was not right for the OPs transmission.

My information was gleaned from a late W209 Owners Manual with (what I thought) was the same 722.9 tranny. More recently he has advised that he has M (manual) feature, which changes everything. I now accept that the gear IS dispayed on the cluster for this model.

The whole issue of the gear 'range' seems like over-engineering, since most of us do not live in the Alps. :)
 

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I personally do not like using the engine in reverse thrust, not good on the pistons and bores, brakes are much cheaper to use unless you have such a steep hill there would be a risk of the brakes overheating.
Are you OK pressing the skinny pedal? Because that is way worse for the pistons and the bores than just compressing air with no fuel.
 
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