7G-Tronic and Manual-Mode

[blassberg]

Anybody experienced the 7G-Tronic?
Anybody experienced the 7G-Tronic with steering wheel shifters?
Is the Manual Mode (S/C/M rather than just S/C) referenced in the C Class Manual a reference to the 7G-Tronic or the 'slated' sequentronic or 5 speed auto or other?

Thanks

 

[blassberg]

Steering Wheel Gearshift Buttons Code 428

MB say Manual Mode is for the above option.

It is a third option along with C and S which are described for the SLK as
C Comfort (not Winter)(not Economy)
S Sport (not Standard)

It could therefore relate to any of the autoboxes that has this option added.

AMG paddle shifters are different and not sure if they have a Manual Mode.

 

[jberks]

C320cdi

I thought they couldn't get the 320CDI engine into the C? I haven't seen one on the MB site, best they appear to do is the 270. - where did you get it from ?

 

[blassberg]

C320cdi

ah..it's the new V6 3.0 engine, available in Germany now

Click here for Technical Data

It is not yet launched in the UK but you can order one. Mine's due in September.

 

[blassberg]

interestingly in M mode the gears still change automatically and it doesn't get anywhere near the rev limiter (which is good as I am still running in)

maybe it's the computer saying "yep, you should have changed there - thought you could do better than me and you blew it - again" :?

 

[blassberg]

'cording to the manual....

Non AMG,
if you press the accelerator fully it shifts up at the max speed for each gear to prevent over-revving.

AMG (for C55AMG)
auto does not upshift even if you over-rev. If the engine reaches its rev-limit the fuel supply is cut to prevent the engine from over-revving. You must make sure that the engine speed does not enter the red zone...or risk of engine damage..

So looks like my M and SLinKy's AGM-M are operating differently and as designed...

Will have to reprogramme brain with new info and go try again.

In practical terms does this mean that on manual mode I can
- manually button down on demand (which I can do by kicking down or tip)
- manually short button up (also extending rev range?)(which I can do with the tip)
- allow auto top rev upshifts (which can be done in auto anyway)
- have auto downshifts at lights etc. (which is auto mode anyway)

Ah well, cool buttons to have and to play.

 

[SLinKyjoe]

looks to me like the buttons are an extention of the tip shift. just better positioned, except when going round a tight bend in 1st and you want 2nd!

am unsure what M does tho, if yours auto upchanges. Does it hold it in gear longer? up and down the revs as it were?

are your buttons both up and down shift dual action? or left for down, right for up?

 

[blassberg]

Does it hold it in gear longer? up and down the revs as it were?

are your buttons both up and down shift dual action? or left for down, right for up?

Not sure yet, partly as you don't know which gear you are in in D

Both are up and down

 

[SLinKyjoe]

okay. when you go to m mode does the gears go up to 7? or 6 and then d?

in S the SLK will adjust its gearchange to suit your driving immediatly. if you are pressing hard for a few changes and then ease off it holds the gear before changing later. if you influence it with a nudge up, it changes early until you boot it again. it doesnt do that in C tho.

If I am in S or C and doing 30mph it will upchange to 5th. but in M it will only go as far as 4th. however it will hold 5th in M mode down to 26mph, whereas in s or c it will downchange at 29mph.

i have noticed that the slinkymobile doesnt hold on hills without the brake. the last SLK did. it doesn't matter too much as i have a proper handbrake but wondered if it is with this gearbox and not the car? does yours? you may find it hard to get it to hold without creeping forward as diesels seem to have huge torks at idle.

seems you have the same torque rating as mine too. but howcome the C 55 has 367BHP with the same enegine as mine and yet mine has 360?

 

[blassberg]

Will do some testing.....

wondered if the C55 / SLK55 power outputs is a BHP/HP thing.

My car has 224HP but 221BHP

 

[SLinKyjoe]

Will do some testing.....

wondered if the C55 / SLK55 power outputs is a BHP/HP thing.

My car has 224HP but 221BHP

is that the BHP vs PS thing. there is a calculation which makes PS turn into BHP. times it by 1.069 or something i think.

bit like the difference between ton and tonne. all of 16kg.

yours has 376lb/ft torque as does both the 5.5's above.

 

[blassberg]

okay. when you go to m mode does the gears go up to 7? or 6 and then d?

i have noticed that the slinkymobile doesnt hold on hills without the brake. the last SLK did. it doesn't matter too much as i have a proper handbrake but wondered if it is with this gearbox and not the car? does yours? you may find it hard to get it to hold without creeping forward as diesels seem to have huge torks at idle.

M goes to 7, but as my non-AMG will change down (as will yours??) and auto change back up (as yours does not) to 7 (If I were to max it in 6th which I haven't yet) then I'm having to think what is the difference between 7 and D on mine.

Hill test TBA

 

[SLinKyjoe]

yes right okay.

in the SLK200 the difference between C and S was not noticable. it may well have changed up earlier and set off in second but you were hard pressed to tell any difference.

on the 7g-tronic on mine, the difference between C and S is very obvious. just had a quick blast arund the dales. the car will change up in C mode under hard accelaration at around 4000rpm. it also changes up as you lift your foot from the pedal while you assess the road, drive road corners etc, then only changes down once a firm prod has been used.

In S mode it changes up when i tell it, It will probably go on to the red marks at 6400rpm but i dont let it, but it holds the gear when you feather the throttle, and changes down auto style as quick as an auto can. not quite instant but still good. what i do notice is the car seems a lot more responsive in S. Maybes it does more than just preset the gearbox parameters.

shall have a go in M mode in the same roads as soon as it goes passed its running in restrictions. (50miles away)

 

[blassberg]

i have noticed that the slinkymobile doesnt hold on hills without the brake. the last SLK did. it doesn't matter too much as i have a proper handbrake but wondered if it is with this gearbox and not the car? does yours? you may find it hard to get it to hold without creeping forward as diesels seem to have huge torks at idle.

Same as yours. Creeps uphill.
BTW I thought modern autos went into neutral on occasion when standing to reduce fuel consumption. Do you know if that is happening?

 

[SLinKyjoe]

the latest versions have a hill holder device to stop them rolling back on hills. the 200 worked but i dont think the 55 has it. it will roll back on hills where the engine wont produce enough power to creep foward.

to get your to hold you will need some weight in it a reasonabley steep hill. then, i think, it should hold. if it rolls back then the 7g tronic doesnt have the hill holder option.