You should have no problem breaking 16s. I was running low 16s with a few bolt ons and decent 60fts. Thats probably where your problem is. I never has any luck revin the car up and sliping the clutch out. I just waited till the lights were counting down and drove the car just like I do on the street but launchin a little faster. Trying to hold the rpms at 3k never worked for me, I would just spin. Also lower the tire pressure to 20-25psi
