1 We started our IRS upgrade journey at Englishtown Raceway Park. You can see in the tire marks that the rear wheels bounce violently as it claws at the track trying to find traction. After throwing away our best and worst 60-foot time, we averaged the other five times to establish our baseline of 2.062 seconds. This was achieved with a Falken Azenis tires at 32 psi. We plan on improving that!