2001 BMW 4.4L makes burnt smell in interior of the car.

[vladc77]

I got a strange problem. It looks like that that everything is working well; however, I am having a burnt smell in interior of the car when I do real intense acceleration even for a short time. For example, if I am driving 50 ml/hr and then accelerate quickly to 70 or 80 for about 10 sec then I am feeling that smell in the interior. There is no any indication of smoke from the car, the oil level is not changing, I didn’t see any leaks of the oil. I am wondering if someone experienced it before and what was that. Any ideas are highly appreciated.

Thank you in advance.