I actually saw it in another thread, but I can’t remember which one it was. I want to say it was Kinvara that posted about it. (May be wrong on that)
Basically set up as if you would be using launch control (Sport mode, traction off, stability off.) Instead of holding the brake down, pull up on the e brake and hold it up. While holding it up, lightly press the gas and if the car stays put, continue towards 2500 rpm. When I hit 2500 or just short of it, I let go of the e brake and floor it at the same time.
Launch control holds the rpms right around 2250 and won’t go above that. You may be able to push beyond 2500 with this method, but mine wants to pull through the brakes at that point so I use that as a good spot for me.
If the e brake doesn’t hold you while lightly applying gas, let off the gas and slowly try again. You can’t do it quickly or it wants to pull through.