Automatic Owners....SPORT/COMFORT mode?
12-11-2020, 05:31 PM
#51
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2005 Mercedes Benz C240
12-14-2020, 04:01 AM
#52
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Ok so the 722.6/722.9 boxes actually have a few modes (some disabled from factory), but I've reverse engineered the stock controller to work out how these work.
S (Standard) - default map. Starts in first gear C (Comfort) - less aggressive shift mapping. Starts in second gear W(Winter) - default map but starts in second gear. In newer controller's (after 2004), this was replaced with Comfort mode as the default.
A (Agility) - Very aggressive shift mapping, starts in first. Basically it feels like Sport+ on the newer mercs. The car will almost jerk when shifting and it tries to hold the revs almost until red line... This can be unlocked on the controller's built after 2004 bit not sure about controller's built prior...
M (manual) - standard shift mapping but you tell the car when to change gear rather than the gearbox using paddles on the steering wheel, or tapping on the shifter.
A few notes:
1. When in manual mode. The car will shift up to the next gear if it hits red line, however there is a coding variable to disable this behaviour, I believe it's not enabled on AMG vehicles to allow them to bounce off the rev limiter.
2. This "undocumented hill stop feature"...Don't rely on it. It's due to a sprag within the transmission locking when in 2nd gear...and it probably isn't designed to support the whole weight of a car on an incline!
3. It is possible to unlock modes even if the button only says C and S or W and S. That button just tells the controller over canbus to cycle to the next mode.
4. The controller does a ton of monitoring and can actually tell the engine to cut power momentarily over canbus if it detects too much torque during a gear shift, in order to preserve the clutch packs.
5. The controller is a bit stupid with how it selects a pressure for a shift. When it decides to shift gear, it takes into account engine torque, speed and pedal position, then it selects pressure for the gear shift. This can actually be abused to make the car shift a bit quicker. In manual mode, put your foot a bit further down on the accelerator pedal, then select the next gear. Wait 1 second, then release the accelerator pedal. The car will now shift gears with high pressure but without the engine producing the torque the transmission thought it would. The result is a super snappy shift.
S (Standard) - default map. Starts in first gear C (Comfort) - less aggressive shift mapping. Starts in second gear W(Winter) - default map but starts in second gear. In newer controller's (after 2004), this was replaced with Comfort mode as the default.
A (Agility) - Very aggressive shift mapping, starts in first. Basically it feels like Sport+ on the newer mercs. The car will almost jerk when shifting and it tries to hold the revs almost until red line... This can be unlocked on the controller's built after 2004 bit not sure about controller's built prior...
M (manual) - standard shift mapping but you tell the car when to change gear rather than the gearbox using paddles on the steering wheel, or tapping on the shifter.
A few notes:
1. When in manual mode. The car will shift up to the next gear if it hits red line, however there is a coding variable to disable this behaviour, I believe it's not enabled on AMG vehicles to allow them to bounce off the rev limiter.
2. This "undocumented hill stop feature"...Don't rely on it. It's due to a sprag within the transmission locking when in 2nd gear...and it probably isn't designed to support the whole weight of a car on an incline!
3. It is possible to unlock modes even if the button only says C and S or W and S. That button just tells the controller over canbus to cycle to the next mode.
4. The controller does a ton of monitoring and can actually tell the engine to cut power momentarily over canbus if it detects too much torque during a gear shift, in order to preserve the clutch packs.
5. The controller is a bit stupid with how it selects a pressure for a shift. When it decides to shift gear, it takes into account engine torque, speed and pedal position, then it selects pressure for the gear shift. This can actually be abused to make the car shift a bit quicker. In manual mode, put your foot a bit further down on the accelerator pedal, then select the next gear. Wait 1 second, then release the accelerator pedal. The car will now shift gears with high pressure but without the engine producing the torque the transmission thought it would. The result is a super snappy shift.
Last edited by rnd_ash; 12-14-2020 at 04:04 AM.
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