Magneti Marelli CFC 8TDW FCA

FCA Gearbox TCU [EN]

Discover the true potential of your vehicle. It's your time to learn to remap the gearbox!
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Did you tune a vehicle's ECU and didn't get the increments you were hoping for? A common cause could be the automatic transmission! Let’s remove everything that holds your vehicle back from expressing its true potential…

This example, dedicated to the TCT C635 automatic transmission, allows you to learn how to take action on different parameters of the transmission control unit of your vehicle to achieve changes with different applications: increase the revs, increase the gear change speed, the power limiters and much more! Choose what changes to apply to your transmission and do it immediately!

The TCT C635 gearbox is installed on a vast number of vehicles within the FCA group. Taking this example means having the possibility to work on many transmission control units, thus fulfilling all of your customers’ requests.

The first section of this tuning procedure will show the characteristics of the TCT C635 gearbox and a list of the compatible vehicles. In the second part it will be shown how to tune using the ECM Titanium software. Lastly, the modified performance will be compared to the original one.

The changes that will be presented to you during the practical example have been studied by our Alientech technicians to allow you to unlock the limits imposed by the gearbox control unit, without, however, drastically increasing fuel consumption or putting the efficiency and function of the transmission at risk.

Compatible Vehicles

Vehicle Gearbox version TCU Transmission
Alfa Romeo C635 Magneti Marelli 6-speed
Chrysler C635 , C636 Magneti Marelli 6-speed
Dodge C635 Magneti Marelli 6-speed
Fiat C635 Magneti Marelli 6-speed
GAC Fiat Automobiles C725 Magneti Marelli 7-speed
Jeep C635 Magneti Marelli 6-speed
Lancia C636 Magneti Marelli 6-speed

Model Gearbox model Engine Power Fuel
4C C635 1750cc 177kW Gasoline
4C Spider C635 1750cc 177kW Gasoline
Giulietta (940) C635 1600cc 88kW Diesel
Giulietta (940) C635 2000cc 125kW , 128kW Diesel
Giulietta (940) C635 1400cc 125kW Gasoline
Giulietta (940) C635 1750cc 177kW Gasoline
MiTo (955) C635 1400cc 99kW , 103kW , 125kW Gasoline

Model Gearbox model Engine Power Fuel
Chrysler 200 C636 2400cc 129kW Gasoline

The video example is suitable for both beginners and more experienced tuners: choose what to modify, and use it as a starting point for even more extreme maps!

The TCT C635 gearbox analyzed here is installed on vehicle platforms with front, rear and all-wheel drive and it integrates the car immobilizer system. This transmission is controlled by Magneti Marelli CFC 8TDW transmission control unit. The car analysed here is a Alfa Romeo Giulietta Quadrifoglio Verde with a 177 kW 1.8 TBi engine, but the intervention possibilities extend over a wide range of vehicles.


  • Magneti Marelli CFC 8TDW TCT C635
  • Alfa Romeo Giulietta Quadrifoglio Verde, petrol, 2014

One lesson of about 20 minutes, composed by 3 sections:

First section:

in this part of the course we will describe the characteristics of the vehicle by listing version, equipment, year of production, traction and type of gearbox. Then, we indicate all the vehicles – even of different car manufacturers – equipped with the same engine or similar version; immediately after, the specifications of the engine control unit will be specified in detail: that is the identification data and the versions for the emission classes. In addition, we talk about the types of connection with Alientech tools – which are useful for the remapping – by indicating the protocols of use, the available functions and giving some practical advice for editing operations. Finally, the structure of the original file is presented by indicating the addresses and the various areas.

Second section:

this part directly addresses the remapping practice. After a brief introduction, we present the summary list of the maps that will be modified, the Alientech modification method and its specific application to the vehicle in question. Following the wizard of this online course, you will be able to create a mapping that will ensure high performance and guaranteed reliability.

Third section:

this last part is dedicated to the discovery of the potentialities of this remapping practice: the new increases, compared to the original settings of the vehicle in a precise and detailed chart, clarify efficaciously how this remapping practice is effective and surprising.

DIGITAL attachments
Magneti-Marelli TCT C635



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