It's the pit lane speed limiter (limited to 80 km/h) turned on by default in certain cars when you drive off the pit box. Press L to deactivate it.

"my friend bought" ....he not able to ask for it?

" my friend just bought a S3 license and he has a problem with some of his cars"

More like: I use pereulok and I need help

Lol, if your friend needed help he would post it himself. Don't lie and buy the game if you like it.