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Navigation: Advanced > BMW DCT gearbox control

DCT installation and wiring

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BMW DCT related links

BMW DCT BIG HOWTO. <-- READ this guide, please, just do it before asking questions already covered.

BMW DCT error codes.

BMW DCT TCU firmware flashing.

BMW DCT CAN protocol.

BMW INPA diagnostic tool.

DCT clutch relearn.

DCT hardware identifier

DCT hardware upgrade.

BMW installation and wiring.

DCT shifter emulation.

DCT Realtime Data description.

DCT shifting options.

MTune - DCT Control.

MTune - DCT Settings.

 

Hardware needed for the BMW DCT (GEN1/GEN2) gearbox installation

 

 

1 - DCT cable harness between MaxxECU and DCT gearbox.

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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)

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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.

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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.

 

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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.

 

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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

61317842102

OPTIONAL, see DCT shifter emulation.

BMW M3 E9x DCT shift knob with boot

25122283705

OPTIONAL, see DCT shifter emulation.

Drivelogic button

61317835039, 2128

OPTIONAL, see DCT shifter emulation.

BMW INPA or other diagnostic tool for DCT

BMW INPA

 

MaxxECU DCT cable harness.

2015

We ONLY support this cable harness, if you make your own, you are on your own...

DCT park-lock (unlock)

2179

 

DCT transmission fluid

Pentosin FFL-4

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.

2254

We ONLY support this cable harness, if you make your own, you are on your own...

DCT park-lock (unlock)

2179

 

xHP WIFI OBD adapter

2246

To flash our custom MaxxECU TCU firmware.

xHP flash codes

xHP-combo

 

DCT transmission fluid

Pentosin FFL-4

Most DCT/DSG oil will most likely work...

 

Required inputs.

Description

Part no

Note

Brake pedal/stop light active input.

 

 

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.

 

 

 

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A similar park unlock mechanism MUST BE USED since we do not control the park solenoid, it can be bought here (product ID: 2179).

 

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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.

 

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DCT connector (gearbox side)