Hey guys, I have a few tips for you.
I just helped my friend edwiitos unlock this. I unlocked it legit during our session but if you are having trouble winning races, you can try doing what we did for him.
We found that the playlist 'NFS Edition Playlist' is deadly quiet. We were online from midnight (GMT) / 7pm (EST) and completed various races until the bonus wheel landed on the 75g for the next session.
For the first 1hr15, no randoms joined but we had one in the last session/playlist. This lobby was really quiet and benefited us.
Also, when selecting a playlist to use, some have less races then others. I have listed some below (NB: if anyone is aware of the other lists, write in the comments and I will update)
Desert at Night - 3 races
Minnesota to Wisconsin - 2 races
Kentucky - 2 races
Burning City - 4 races
Fire and Ice - 2 races
Flat Out - 3 races
Sandblaster - 4 races
Espresso - 4 races
Please comment if you use this solution and find certain times of the day that are better than others. Help each other. Let us work out the best time!
NB: when connecting, if you have a message saying that you are unable to join the session as you have incompatible versions, it means that one of you (at least) has the 'Need For Speed the Run update v1.1' from the Marketplace. It is a free download.
Update :
PJ76uk found the Manufacturer playlist quiet at 2am (GMT) / 9pm (EST)