In the weekend we scoped the vr sensor and we find out (with Marcel's help) that the sensor wheel is the bad part of the trigger.

The owner of the car made the wheel from an Opel Corsa trigger wheel because that is the smallest, and he welded the metal sensor wheel to the vbelt wheel. The only problem was that the welding changed the steel's magnetism. The sign was too high in the first part and too low in the middle. The vems input trigger setup filters the sign and the low signs have been cut of. This was the reason of the missfire. At 2500 rpm the missfire was so much that the enginge wouldn't rev more. Then we welded the sensor wheel around to smothen the magnetism. The sign was like so afterwards:

Than we tried to rev the car but it stoped at 2500 rpm and the sensor sign was like this:

We looked at the sensor wheel and we saw it has a little deformation from the welding from the 7 and the 10 trigger tooth. We hammered the deformation and finaly the engine reved to 7000 rpm limit where the target was.