Transmission changes?

[dolebludger]

This is probably a stupid question. I'll admit that from the start. But here goes.

My '04 C 320 is actually designed (so I'm told on good authority) to decrease throttle a bit right before the 5 speed auto trans. makes a shift, to make the shift feel more smooth to the occupants. I also understand that AMG (in cars using this same transmission) was able to program them for a "harder" shift -- in other words, with no throttle back-off.

Is there a modification that is physically and economically feasible to do to eliminate the throttle back-off in my car, to make the shifts more "direct" and at the expense of any "comfort" of the occupants?

[Don350SDL]

Not a dumb question at all.

Theoretically the answer is yes, but you'd have to be fooling with internal software programming of the transmission control box, and without very specific knowledge it may be a daunting task.

Of course, MB cannot assist in this endeavour, since this might be related to emissions, and as such they as a manufacturer are prohibited by Federal law from even discussing the possibility of doing something that may bring the car out of its certified compliance. Or something like that, anyways.

For firmer shiffts, press harder on the gas.

Don

[C32AMG]

This is probably a stupid question. I'll admit that from the start. But here goes.

My '04 C 320 is actually designed (so I'm told on good authority) to decrease throttle a bit right before the 5 speed auto trans. makes a shift, to make the shift feel more smooth to the occupants. I also understand that AMG (in cars using this same transmission) was able to program them for a "harder" shift -- in other words, with no throttle back-off.

Is there a modification that is physically and economically feasible to do to eliminate the throttle back-off in my car, to make the shifts more "direct" and at the expense of any "comfort" of the occupants?

It’s called automatic transmission overload protection and is usually installed in cars with higher torque engines.

Its purpose, protects the transmission from thermal overload when shifting and improves shift quality of a 2nd to 3rd and 3rd to 2nd shift at WOT, By retarding ignition timing for 400MS.

Improving shift quality in a non 722.6AMG transmission requires a software re flash /upgrade to the TCM that only a dealer or good tuner can do, and may also require an AMG valve body up grade since they are matched to the TCMs, lots of $$$$$. Just buy an AMG. :)

[dolebludger]

Thanks, all:

Basically, I now understand that what I asked can't feasibly be done, and cost would outweigh any benefits.

Thanks for the info,