C63 software logic: transmission/exhaust related
Thread Starter
Junior Member
Joined: Aug 2010
Posts: 49
Likes: 13
From: Los Angeles
'18 C63s Coupe
C63 software logic: transmission/exhaust related
So I'm 2500 miles into my new '18 C63s coupe, and still can't figure out much of the logic behind this car's ECU/TCU. It's a total black box that behaves differently on any given day. Some days it sounds great, other days it lumbers along and is relatively quiet (all in the same driving/exhaust mode). All that said, here's a few exhaust traits I've noticed (PE, all in S+, except suspension in C):
- Exhaust gets quieter at idle when you fully depress brake pedal
- Exhaust gets quieter in Manual mode (with fewer pops/cracks)
- Exhaust stays quieter when you flip back to Auto from Manual
- Exhaust resumes "louder" behavior in Auto only after shutting off car and restarting.
- Exhaust get's quieter (even with aggressive driving) after having driven for some time conservatively (such as in freeway traffic).
- Exhaust tone is best from 2500-4000 RPMs
- Exhaust is relatively quiet at full throttle (mostly mechanical and road noise)
Anyone else have these (or others)?
- Exhaust gets quieter at idle when you fully depress brake pedal
- Exhaust gets quieter in Manual mode (with fewer pops/cracks)
- Exhaust stays quieter when you flip back to Auto from Manual
- Exhaust resumes "louder" behavior in Auto only after shutting off car and restarting.
- Exhaust get's quieter (even with aggressive driving) after having driven for some time conservatively (such as in freeway traffic).
- Exhaust tone is best from 2500-4000 RPMs
- Exhaust is relatively quiet at full throttle (mostly mechanical and road noise)
Anyone else have these (or others)?
Last edited by brevets; Sep 3, 2018 at 11:55 PM.
MBWorld Fanatic!
Joined: Jul 2015
Posts: 1,216
Likes: 114
From: SoCal
2016 C63S Sedan
So I'm 2500 miles into my new '18 C63s coupe, and still can't figure out much of the logic behind this car's ECU/TCU. It's a total black box that behaves differently on any given day. Some days it shifts aggressively and sounds great, other days it lumbers along and is relatively quiet (all in the same driving/exhaust mode). All that said, here's a few exhaust traits I've noticed (PE, all in S+, except suspension in C):
- Exhaust gets quieter at idle when you fully depress brake pedal
- Exhaust gets quieter in Manual mode (with fewer pops/cracks)
- Exhaust stays quieter when you flip back to Auto from Manual
- Exhaust resumes "louder" behavior in Auto only after shutting off car and restarting.
- Exhaust get's quieter (even with aggressive driving) after having driven for some time conservatively (such as in freeway traffic).
- Exhaust tone is best from 2500-4000 RPMs
- Exhaust is relatively quiet at full throttle (mostly mechanical and road noise)
Anyone else have these (or others)?
The main frustration I have is it sounds and shifts perfect sometimes, but for the most part, the computer (not me) is making those decisions (seemingly randomly). Just wish AMG would be more transparent about the software program logic so we could know what triggers the different behaviors (e.g. shifts, exhaust valves, pops/cracks).
- Exhaust gets quieter at idle when you fully depress brake pedal
- Exhaust gets quieter in Manual mode (with fewer pops/cracks)
- Exhaust stays quieter when you flip back to Auto from Manual
- Exhaust resumes "louder" behavior in Auto only after shutting off car and restarting.
- Exhaust get's quieter (even with aggressive driving) after having driven for some time conservatively (such as in freeway traffic).
- Exhaust tone is best from 2500-4000 RPMs
- Exhaust is relatively quiet at full throttle (mostly mechanical and road noise)
Anyone else have these (or others)?
The main frustration I have is it sounds and shifts perfect sometimes, but for the most part, the computer (not me) is making those decisions (seemingly randomly). Just wish AMG would be more transparent about the software program logic so we could know what triggers the different behaviors (e.g. shifts, exhaust valves, pops/cracks).
I had a loss of power on an intermittent basis and was regained with a restart.
Mine is a 2016 sedan and they had a TSB on a vacuum hose on the turbos and after replacement it never happened again. This might not be your problem but it is another tool to use.
