Using OpenXWD causes the car to not pitch at all during acceleration

The OpenXWD example vehicle included in Formula Carmaker doesn’t change its pitch at all during acceleration, it stays completely flat, while it does pitch forwards just fine under braking.
I managed to trace it back to which powertrain model is selected. Simply changing the powertrain to anything else other than OpenXWD makes the roll under acceleration just fine, so it isn’t anything about kinematics, or other parts of car setup.

One way to see the effect is by viewing Car.Hitch.tz and Car.Gen.tz using Application > Direct Variable Access or inside Simulink. They stay at exactly the same height relative to each other during acceleration, and if aerodynamics model is disabled they stay at the same height no matter if the car is stationary or fully accelerating.
So it seems some part of physics calculations is not being done when the wheel torque is set inside Simulink and not using one of the built in CM powertrains.

The same issue affects our custom powertrain build on top of the OpenXWD example.

I have encountered that with Carmaker 12.0.1 on Linux and examples downloaded in September. I will test CM 13 and new examples as soon as possible, but for now I couldn’t as I am getting errors on the website trying to get new license or downloading the new version.

I would be thankful if someone could validate my findings. Does anyone know a way to work around this issue?

Hi @JacekJagosz,
thank you so much for your analysis and the detailed description of your observation. This is an abnormality and we need to invest some resources to confirm if this is a bug. For that purpose, we have created a normal support ticket and we will contact you personally for possible queries. Once the analysis is finished, we will post the results in this forum again.

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I just wanted to add that I have tested the same thing with fresh install of Carmaker 13, the newest example OpenXWD car and Simulink script and on Windows this time, the issue still presists.

If I can do any more testing or provide more information I would love to help.