This article was adapted for drivers and tuning professionals in the United States by Viezu USA. Measurements are shown in US units alongside the originals.
First aired live on Tuesday, January 13, 2026, this was Viezu's opening live WinOLS5 tuning webinar of the year.
This on-demand video is the recording of that live session, in which we showed real-world diesel ECU map editing on a VW Tiguan 2.0 TDI with a Bosch EDC17C46 ECU.
The focus was hands-on workflow inside WinOLS5, applying tuning theory to a genuine vehicle file instead of isolated examples or generic screenshots. It was aimed at tuners already using WinOLS and those stepping up to more advanced diesel calibration as the year got started.
The EDC17C46 is used widely across VW Group diesels and is still one of the ECUs pro tuners run into most. Throughout the session, we stressed approaching it the right way for safe, consistent, repeatable results.
Viezu CEO Paul Busby hosted, alongside Technical Director Simon White.
Watch the video
What's Covered
You'll see how to find and edit:
- Torque limiter maps
- Torque requests
- Injection duration
- Injection angle
- Turbo pressure and more
All step by step inside WinOLS5, on a real vehicle file.
Viewers learned:
- How to load and navigate a VW Tiguan 2.0 TDI (EDC17C46) ECU file
- How map packs speed up your workflow
- How to adjust performance-critical maps safely
- Live map-editing tips from our Technical Director
- Best practices for reliable diesel tuning in WinOLS5
It's a great chance to watch expert tuners at work, with no filler, just practical knowledge you can use.
US emissions compliance note
In the United States, modifying, removing or disabling emissions-control equipment (including DPF*, EGR*, SCR*/DEF* and catalytic converter systems) on a vehicle used on public roads may violate the federal Clean Air Act and EPA rules, and in California and other states that follow CARB standards, additional restrictions apply. Any off-road, race or competition-only modification described here is not intended for street use. Nothing in this article claims that any product or calibration is EPA- or CARB-certified or street legal. For guidance on options for your vehicle, contact Viezu USA.
Talk to Viezu USA
Want to know what Viezu can do for your vehicle or your business? Request a performance upgrade quote, browse viezuusa.com or contact the Viezu USA team.
* EMISSIONS TAMPERING WARNING
Removing, disabling, deleting, or rendering inoperative any emissions control device or system (including DPF, EGR, SCR/DEF, catalytic converters, and related sensors or software) on a vehicle used on public roads is prohibited under the U.S. Clean Air Act and may also violate state laws, including California Air Resources Board (CARB) regulations. Violations can carry substantial civil penalties for vehicle owners, installers, and sellers.
Any reference in this article to DPF, EGR, SCR, or other emissions-related functions is provided for informational purposes and, where applicable, for closed-course competition or off-road use only where permitted by law. Viezu USA does not condone emissions tampering on any road-going vehicle. It is the customer's sole responsibility to ensure that any modification complies with all applicable federal, state, and local laws, regulations, and policies, regardless of what country you live in.