C43 TCU limitation
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Joined: Nov 2022
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From: Bulgaria
C43 AMG '17 / Stage II
C43 TCU limitation
Hello
Does someone who runs on stage 2 and have latest TCU update from dealer notice less power unless turn off completely traction control?
For several months I was trying to understand why my car cut power and I notice yesterday when i drive for whole day with completely turned off TC that the car produce it's power as should be (as it was before but with turned on TC)
Is really weird to turn off all the time TC to have my power as before when TC is on
I do know that even with turned TC the car cuts bit of power but now cuts a way lot, not sure how to handle that
Should I ask the mapper to do new ECU stage 2 or I will need some TCU stage..
Does someone who runs on stage 2 and have latest TCU update from dealer notice less power unless turn off completely traction control?
For several months I was trying to understand why my car cut power and I notice yesterday when i drive for whole day with completely turned off TC that the car produce it's power as should be (as it was before but with turned on TC)
Is really weird to turn off all the time TC to have my power as before when TC is on
I do know that even with turned TC the car cuts bit of power but now cuts a way lot, not sure how to handle that
Should I ask the mapper to do new ECU stage 2 or I will need some TCU stage..
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Joined: Jul 2018
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2017 Mercedes C63s
If the dealership touched the ECU/TCU then you will most likely need a retune. Plus the old tune was probably tuned for stock TCU, after the dealership updated the TCU, the ECU is probably off or not tuned for the new update.
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Super Member
Joined: Nov 2022
Posts: 512
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From: Bulgaria
C43 AMG '17 / Stage II
what the mapper told me is that the remap values are the same as previous remap to have the same power as before BUT i feel something is not as should be because of the TCU cutting power, he tried to do 3 diff maps and still same behaviour, the issue is that he can't do TCU and im thinking if I should go to another tunner
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Joined: Nov 2021
Posts: 47
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C43 AMG W205
Yes. The latest dealer tune will update the trans tune independent of your ECU tune, and theres some kind of limitation added. I went to reload my ECU tune afterwards, and it was already there, same version. But the trans code was different. Car has lost boost and power after low rpms. I will try the no traction control thing... would be great to get the power back.
Thread Starter
Super Member
Joined: Nov 2022
Posts: 512
Likes: 86
From: Bulgaria
C43 AMG '17 / Stage II
Yes. The latest dealer tune will update the trans tune independent of your ECU tune, and theres some kind of limitation added. I went to reload my ECU tune afterwards, and it was already there, same version. But the trans code was different. Car has lost boost and power after low rpms. I will try the no traction control thing... would be great to get the power back.
not sure either how i can remove this limitation or to revert somehow my TCU version if possible without having old version files
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Super Member
Joined: Nov 2022
Posts: 512
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From: Bulgaria
C43 AMG '17 / Stage II
no i went to him he pull my ecu stock file and did the remap and then upload it, without dyno, but even prev time when he did it it was without dyno and all was smooth and great BUT now with this update something is wrong and i can feel how the car cuts the power even though i have changed all valves (turbo, tranducer, vacuum pump) nothing so far..
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C43 AMG W205
I tried the car with and without TC on, and it makes zero difference. The car is the same speed off the line, but then somethings holding it back in the higher rpms.
History is I unloaded ECU tune from car, dealer updated TCU but not ECU (when I got it back the original ECU tune loaded back on which doesnt work if they update it). The jerky 1st gear rubbish in S+ has been completely fixed since the moment the dealer updated it which is a plus.
At some point I'd like to get it on the dyno and see if we can see whats going on since their update
History is I unloaded ECU tune from car, dealer updated TCU but not ECU (when I got it back the original ECU tune loaded back on which doesnt work if they update it). The jerky 1st gear rubbish in S+ has been completely fixed since the moment the dealer updated it which is a plus.
At some point I'd like to get it on the dyno and see if we can see whats going on since their update
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Thread Starter
Super Member
Joined: Nov 2022
Posts: 512
Likes: 86
From: Bulgaria
C43 AMG '17 / Stage II
I tried the car with and without TC on, and it makes zero difference. The car is the same speed off the line, but then somethings holding it back in the higher rpms.
History is I unloaded ECU tune from car, dealer updated TCU but not ECU (when I got it back the original ECU tune loaded back on which doesnt work if they update it). The jerky 1st gear rubbish in S+ has been completely fixed since the moment the dealer updated it which is a plus.
At some point I'd like to get it on the dyno and see if we can see whats going on since their update
History is I unloaded ECU tune from car, dealer updated TCU but not ECU (when I got it back the original ECU tune loaded back on which doesnt work if they update it). The jerky 1st gear rubbish in S+ has been completely fixed since the moment the dealer updated it which is a plus.
At some point I'd like to get it on the dyno and see if we can see whats going on since their update
