BMW DCT related links
•BMW DCT BIG HOWTO. <-- READ this guide, please, just do it before asking questions already covered.
•BMW DCT TCU firmware flashing.
•DCT Realtime Data description.
Hardware needed for the BMW DCT (GEN1/GEN2) gearbox installation
1 - DCT cable harness between MaxxECU and DCT gearbox.
MaxxECU DCT cable harness for the correct gearbox:
BMW M3 (GEN1) DCT harness, product ID 2015.
BMW M4 (GEN2) DCT harness, product ID 2254.
Note: We only support our cable harness, nothing prevents you from creating your own, but then you are on your own.
2 - BMW DCT/DKG gearbox (GS7D36SG) 335/M3 (GEN1) or M4 (GEN2)
The actual BMW DCT gearbox...see DCT hardware identifier.
Note: If your intention is to pass more than 850-900Nm through this gearbox, read our DCT hardware upgrade.
3 - BMW OE shifter and buttons.
Image of an BMW E9x M3 shifter assembly, optional.
Note: if using an M4 gearbox, the OE M4 shifter must be used, unless using the DCT shifter emulation.
The BMW drivelogic button, optional for GEN1.
The OE shifter (GEN1/GEN2) and drivelogic button (GEN1) is optional, instead the DCT shifter emulation can be used to emulate the shifter and use digital inputs to control the gearbox.
4 - Paddle shifters (optional)
Note: We do not support the OE BMW paddles.
Paddle shifters from example Mercedes, part number A 171 267 00 46. Or any other paddle shifters (or buttons on the steering wheel) that "closes" the circuit when pressed.
Note on GEN1: Using the DCT shifter emulation, paddle input in harness does not need to be used, use the digital inputs DCT UP shift and DCT DOWN shift instead.
Required BMW E9x (GEN1) hardware
Description |
Part no |
Note |
MaxxECU controlling the engine |
All MaxxECUs |
Preferable with E-Throttle (downshifts will be slow without throttle blip). |
BMW M3 E9x DCT gearbox |
GS7D36SG |
|
BMW M3 E9x DCT gear selector |
OPTIONAL, see DCT shifter emulation. |
|
BMW M3 E9x DCT shift knob with boot |
OPTIONAL, see DCT shifter emulation. |
|
Drivelogic button |
OPTIONAL, see DCT shifter emulation. |
|
BMW INPA or other diagnostic tool for DCT |
|
|
MaxxECU DCT cable harness. |
We ONLY support this cable harness, if you make your own, you are on your own... |
|
DCT park-lock (unlock) |
|
|
DCT transmission fluid |
Most DCT/DSG oil will most likely work... |
Note: any E9x DCT gearbox will most likely work, with their respective gear selector and buttons, but we will only support the E9x M3 version with our DCT harness for now.
Make sure the TCU firmware is correct for the connected accessories (shifter, buttons etc).
Required M4 (GEN2) hardware
Description |
Part no |
Note |
MaxxECU controlling the engine |
All MaxxECUs |
Preferable with E-Throttle (downshifts will be slow without throttle blip). |
BMW M4 Fxx DCT gearbox |
GS7D36SG |
|
BMW M4 Fxx DCT gear selector |
|
OPTIONAL, see DCT shifter emulation. |
MaxxECU DCT cable harness. |
We ONLY support this cable harness, if you make your own, you are on your own... |
|
DCT park-lock (unlock) |
|
|
xHP WIFI OBD adapter |
To flash our custom MaxxECU TCU firmware. |
|
xHP flash codes |
|
|
DCT transmission fluid |
Most DCT/DSG oil will most likely work... |
Required inputs.
Description |
Part no |
Note |
|
|
|
Vehicle speed input (wheelspeed sensor). |
|
Vehicle speed input is REQUIRED. |
Any paddle shifter (which closes a circuit). |
|
If you want paddle shifters, which you most likely want. OPTIONAL, see DCT shifter emulation. |
A similar park unlock mechanism MUST BE USED since we do not control the park solenoid, it can be bought here (product ID: 2179).
Note on GEN1 DCT Harness: The above 2-pin connectors is not used in our harness, our intention was to use the park feature on the gearbox, but we disabled its usage and you must instead use a park disabling mechanism.
DCT connector (gearbox side)
