# Box 2d car weird behaviour

**URL:** <https://forum.kirupa.com/t/box-2d-car-weird-behaviour/326558>\
**Category:** Uncategorized\
**Created:** [December 23, 2011, 4:02pm UTC](https://forum.kirupa.com/t/box-2d-car-weird-behaviour/326558 "2011-12-23T16:02:55Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![steffen99](https://avatars.discourse-cdn.com/v4/letter/s/f17d59/32.png) [@steffen99](https://forum.kirupa.com/u/steffen99)\
**Post date:** [December 23, 2011, 4:02pm UTC](https://forum.kirupa.com/t/box-2d-car-weird-behaviour/326558/1 "2011-12-23T16:02:55Z")

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Hi guys, i´m testing with box2d and modifying this code by emanuele f.

I modified the car, increased acceleration.  
Now when i accelerate to drive to the right, the car starts spinning into the other direction.

you can see it in this video: [box3d car test](http://www.youtube.com/watch?v=GHHqSmLe6Uo)  
the only thing i do is accelerate the wheels.

Any idea why the whole car starts spinning?  
[URL=“[http://www.youtube.com/watch?v=GHHqSmLe6Uo](http://www.youtube.com/watch?v=GHHqSmLe6Uo)”]