Volvo I-Shift Dual Clutch Transmissions for ETS2 and ATS

This repository contains source code for mods to add Volvo's I-Shift Dual Clutch SPO2812 transmissions to the Volvo FH4, FH5, FH6, and Renault T in European Truck Simulator 2, and the VNL 2014, 2018, 2025, and Mack Anthem and Pinnacle in American Truck Simulator.

This mod is based on SCS's ATO3812G and ATO3812G R from the FH6, with the shift_time attribute set to 0.05 seconds to simulate the faster shifting and continuous torque of a dual clutch transmission.

By default, the generated mods will be €5000 or $5000 more expensive than the equivalent overdrive 12-speed, and have the same unlock level. Default axle ratios for the ETS2 trucks are 2.47, 2.64, 2.85, 3.08, 3.40, and 3.67, and for the ATS trucks are 2.17, 2.47, 2.64, 2.85, 3.08, and 3.42.

Realism notes

For maximum realism, pair this transmission with engines of 2800 Nm (2065 lb-ft) or less torque output, as that is the real-world torque rating. For the FH series, this means a maximum of 13 liter engines. For the VNL series, all stock SCS engines are 2050 lb-ft or less, so any stock engine is compatible (although in real life, it may only work properly on Volvo engines). I don't enforce these pairings, however, if you want to stick this in an FH16. (I use this mod in an FH16 780 myself.)

Volvo Trucks North America has never offered this transmission in the American market as of this writing, so this is a purely hypothetical transmission option in the VNL. It has also never been offered in Renault or Mack trucks. Additionally, SCS did not set the auxiliary brake lever animation on the VNL 2018, 2025, or the Mack trucks up to work with the retarder. This is outside of the current scope of this mod, but I'd like to fix this eventually (see #1).

The real-world transmission is only able to shift quickly between an odd gear and an even gear - skip-shifting should be as slow as a normal I-Shift and result in an interruption in torque. Additionally, shifting between the two ranges (1st-6th and 7th-12th) is a slow shift on the real transmission regardless of whether it can alternate clutches. However, SCS only implements a single shift_time attribute, so this cannot be modeled.

Building and installation

Your system must have a Unix-like shell and GNU m4 installed. If you're using Linux or macOS, this will already be present. If you're using Windows, there's several ways to get this - Windows Subsystem for Linux and a Linux distribution of your choice, Cygwin, or mingw-w64.

Run generate.sh. This will create a build directory, with volvo_fh_dcts and volvo_vnl_dcts directories inside. Locate your game user path, and copy the volvo_fh_dcts directory to your ETS2 mods directory, and/or the volvo_vnl_dcts directory to your ATS mods directory. Alternately, download pre-built release versions from the Releases section of this repository, or from Steam Workshop:

Euro Truck Simulator 2: https://steamcommunity.com/sharedfiles/filedetails/?id=3803466283
American Truck Simulator: https://steamcommunity.com/sharedfiles/filedetails/?id=3802958530

Generative AI

I have not used any generative AI technologies to create these mods, nor have I knowingly used any assets produced using generative AI. This mod references SCS's own soundbanks and icons that the default I-Shift transmissions use, is based on two of SCS's own transmissions from the FH6, and I've used one image directly from Volvo from 2016, well before widespread use of generative AI, as the mod icon.

I will not accept any patches produced using generative AI.