Restrictor plates

Back in 2013, I put my 10.7 car into sportsman for the year (12.0 bottom dial). Unhooking the secondaries was worth about 0.4 seconds, retarding the timing to ~27° was worth about 0.3 seconds, launching the car in second gear was worth about 0.4 seconds (and short shifted it at 5200rpm with my 5k converter...basically shifting as soon as I saw the RPM change). Added ~ 100lbs was about 0.1 seconds.

The final piece was only used in the fall to keep it out of the 11's, and that was a dinky 1" tall 10" diameter air-cleaner that was REALLY dirty, LOL...that thing literally killed 0.2-0.3 seconds all by itself.

With all that installed the car ran 12.0x's....road that thing all the way to the division finals :)

Edit: This "tune" fouled 2 sets of spark plugs that year....ran like crap, but it was very consistent crap.