Hello!
I added new features to the driving simulator and sent it to Rainer... I hope he has time to put it online soon.
First, let's address the 'AltOpa' issue with Gremlins.
Possible causes for driving image failure:
1.) The old valve amplifier is no longer performing as it should (the valve seats are damaged or something similar).
2.) The comparison TDI has more power than stated in its official specifications.
3.) Older cars often have more aerodynamic drag.
4.) The efficiency of the powertrain is lower in older cars.
So, my 90 horsepower gasoline engine from 1991 performs just as well as my father's 90 horsepower TDI...

with a 20% weight advantage for the gasoline engine.
Purely based on feel, the gasoline engine felt stronger than it was when it was new.
Questions for Gremlin:
(I assume you've entered the correct km/h values for each RPM. I think that each gear of the old [vehicle] is geared longer (achieving a higher km/h).)
Where did you get the torque curve for the older model? I want to see the one for mine, but I can't find it online.
Best regards,
Certainly! Please provide the German text you would like me to translate into English. I will only provide the translation.