325i SMG E46 Delay in Transmition

[keta_mainan]

Hello out there.. Every time i accelerate with the cruise option, there will be delay like 2-3 seconds before it change to the second gea, izzit normal? and i do read from other thread stating that with SMG u will fill that jurky when u start to accelerate.. how to overcome both of this problem.. Any one care to help..

 

[B33mEr]

Hmmm ... bro SMG is not an automatic ... Ours is basically a manual gearbox without a clutch pedal it is done via an actuator pump. It's quite crude and violent compare to DSG or twin clutch therefore you cant's eliminate d jerkiness due to the design of SMG.

Having said that however ... you could minimise d jerkiness by doing wats called a SMG adaptation ... whereby d mechanic will calibrate and reset d hydraulics pressure value according to d thickness of d clutch plate and so on. Another way is d style of driving where like in a normal manual car when pressing d clutch you have to ease of d throttle while pressing d clutch and press d gas pedal when releasing d cluitch. when engaging a gear via paddle or gear lever ... ease of d throttle jz before selecting a gear you will find d car much more smoother than before. Same case when selecting cruise mode. hope that helps bro.

 

[wan syahmi]

change atf oil

 

[bmw4eva]

The jerkiness on those early SMG's is quite normal.They became smoother with succeeding models. As for the delay in shifting, I have no clue why its doing that. Perhaps the clutches have worn down and hence the delay in engagement due to the extra gap between the clutches and flywheel.Of course, I could be wrong as that is just my guess.

 

[B33mEr]

The jerkiness on those early SMG's is quite normal.They became smoother with succeeding models. As for the delay in shifting, I have no clue why its doing that. Perhaps the clutches have worn down and hence the delay in engagement due to the extra gap between the clutches and flywheel.Of course, I could be wrong as that is just my guess.

... hence the need to do SMG adaptation based on the clutch thickness and readjusting the pressure values for the hydraulic pump actuator