Re: best techniques for a perfect start
It's different for every car in the game.
Some cars rev up really fast while some cars rev up really slow. You'll have to adjust for each car accordingly.
Since you're asking about how to get a Perfect Launch for Blackridge Rivals races, I'll use Koenigsegg CCX and Ferrari LaFerrari as examples.
To get a Perfect Launch, do these steps:
1. Hold down the throttle.
2. When the "1" has completely disappeared, let go of the throttle.
3. Voila! You got Perfect Launch.
It works almost every time.
Practice getting Perfect Launches when you're farming for stuff in Campaign to prepare you for Blackridge Rivals.