# VVT calibration not working 2.0tsi **URL:** \ **Category:** EMU PRO\ **Tags:** how-to\ **Created:** [April 14, 2026, 2:42pm UTC](https://community.ecumaster.com/t/vvt-calibration-not-working-2-0tsi/5593 "2026-04-14T14:42:20Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![eddi](https://avatars.discourse-cdn.com/v4/letter/e/ee7513/32.png) [@eddi](https://community.ecumaster.com/u/eddi)\ **Post date:** [April 14, 2026, 2:42pm UTC](https://community.ecumaster.com/t/vvt-calibration-not-working-2-0tsi/5593/1 "2026-04-14T14:42:20Z")
Hello. I have a ea888 gen4 equipped with EMU Pro. I use the Ecumaster gen 3 basemap and I am now in the process of recalibrating the cams. But it´s not working with the vvt tuner. The engine stalls everytime and i tried many things. I need some advice. [vvt scope.emuproscp](https://community.ecumaster.com/uploads/short-url/mmLp7YIJerD9JuKY5V99mn9zyiB.emuproscp) (3.1 KB) [vvt log.emuprolog](https://community.ecumaster.com/uploads/short-url/rlZgsmGDgSsimy43fqwJdZMkGje.emuprolog) (2.5 MB) ---
**Author:** ![michal.kowalski](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/michal.kowalski/32/36_2.png) [@michal.kowalski](https://community.ecumaster.com/u/michal.kowalski)\ **Post date:** [April 14, 2026, 2:45pm UTC](https://community.ecumaster.com/t/vvt-calibration-not-working-2-0tsi/5593/2 "2026-04-14T14:45:01Z")
If you can’t upload the files, use an external sharing service, such as [WeTransfer.com](http://WeTransfer.com) ---
**Author:** ![eddi](https://avatars.discourse-cdn.com/v4/letter/e/ee7513/32.png) [@eddi](https://community.ecumaster.com/u/eddi)\ **Post date:** [April 14, 2026, 2:45pm UTC](https://community.ecumaster.com/t/vvt-calibration-not-working-2-0tsi/5593/3 "2026-04-14T14:45:35Z")
[vvt scope.emuproscp](https://community.ecumaster.com/uploads/short-url/mmLp7YIJerD9JuKY5V99mn9zyiB.emuproscp) (3.1 KB) [vvt log.emuprolog](https://community.ecumaster.com/uploads/short-url/rlZgsmGDgSsimy43fqwJdZMkGje.emuprolog) (2.5 MB) ---
**Author:** ![Maciej.Ordowski\_ECUMASTER](https://avatars.discourse-cdn.com/v4/letter/m/e495f1/32.png) [@Maciej.Ordowski\_ECUMASTER](https://community.ecumaster.com/u/Maciej.Ordowski_ECUMASTER)\ **Post date:** [April 15, 2026, 7:30am UTC](https://community.ecumaster.com/t/vvt-calibration-not-working-2-0tsi/5593/4 "2026-04-15T07:30:58Z")
You have a different trigger wheel on camshaft. You have 9 teeth, while the one the basemap comes from has 4. Because of that the engine is synchronised in a different position and it looses the synchronisation when the VVT Tuner advances the cam. What secondary trigger settings do you have? You may post the project as well. ---
**Author:** ![eddi](https://avatars.discourse-cdn.com/v4/letter/e/ee7513/32.png) [@eddi](https://community.ecumaster.com/u/eddi)\ **Post date:** [April 15, 2026, 7:54am UTC](https://community.ecumaster.com/t/vvt-calibration-not-working-2-0tsi/5593/5 "2026-04-15T07:54:18Z")
i have changed it to 9 teeth. I think there is a problem with the sec trigger settings. The engine runs with N-1. With N+1 the engine doesnt start. But for my understanding I´m sure its a N+1 trigger wheel. I atteched my project and a sec trigger wheel picture [Polo fuel fertig+7000rpm vvt.emupro](https://community.ecumaster.com/uploads/short-url/dTS8XsZWYKgxPDVqIXKkHj1jyif.emupro) (35.9 KB) ![trigger sec](https://europe1.discourse-cdn.com/flex013/uploads/ecumaster/original/2X/6/60bd01b16267328484ce56cea336a3372bc733ca.jpeg) ---
**Author:** ![mkuklis\_ECUMASTER](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/mkuklis_ecumaster/32/104_2.png) [@mkuklis\_ECUMASTER](https://community.ecumaster.com/u/mkuklis_ECUMASTER)\ **Post date:** [April 15, 2026, 10:07am UTC](https://community.ecumaster.com/t/vvt-calibration-not-working-2-0tsi/5593/6 "2026-04-15T10:07:30Z")
You are correct, this is an N+1 pattern, and it should work. Using N+1 will make the synchronization point in the other rotation of the engine cycle, compared to what you have now. So switching to N+1 will also require inverting the engine phase in the secondary trigger settings. ![obraz](https://europe1.discourse-cdn.com/flex013/uploads/ecumaster/original/2X/c/ca6eec7a1e643fa7fb8e584c0da5831f439d5d60.png) If that doesn’t work, make a scope with those settings and post it. If it works, the VVT tuner should work fine as well. ---
**Author:** ![eddi](https://avatars.discourse-cdn.com/v4/letter/e/ee7513/32.png) [@eddi](https://community.ecumaster.com/u/eddi)\ **Post date:** [April 15, 2026, 11:04am UTC](https://community.ecumaster.com/t/vvt-calibration-not-working-2-0tsi/5593/7 "2026-04-15T11:04:45Z")
[n+1, invert sec trigger.emuproscp](https://community.ecumaster.com/uploads/short-url/3YSOb9o4KF5PTxKnRzlcdsFp1en.emuproscp) (3.5 KB) N+1 and iverting the secondary trigger did not work ---
**Author:** ![mkuklis\_ECUMASTER](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/mkuklis_ecumaster/32/104_2.png) [@mkuklis\_ECUMASTER](https://community.ecumaster.com/u/mkuklis_ECUMASTER)\ **Post date:** [April 15, 2026, 11:44am UTC](https://community.ecumaster.com/t/vvt-calibration-not-working-2-0tsi/5593/8 "2026-04-15T11:44:50Z")
Interesting. The teeth are not evenly spaced. The difference between short and long gaps is close to triggering, but not enough. Change to “Shorter than factor” pattern with factor 0.7: ![obraz](https://europe1.discourse-cdn.com/flex013/uploads/ecumaster/original/2X/a/a7d401084bf1f6e7852b097b601419da24df1fdb.png)