Car is lowered, so that hurts your traction because of the increase in negative camber. Stiffer springs and lower center of gravity also kill weight transfer. 18 psi is waaaay too low for street tires at the strip. My 60' times get worse if I go below 29 psi, plus it kills your MPH at the big end. Wide tires with a small stiff sidewall do not increase straight line traction. tall tires with a huge soft sidewall do. I've heard disconnecting the front sway does nothing for increasing traction ( besides lower weight when removed ) on an independent rear susension car because we load the rear tires evenly. The diferential is mounted to the chassis and is not suspended by the springs like a live axle car.
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