Actually the tire jack and passenger seat are over 100 lbs. 100 lbs is a tenth of a second in the quarter. In the eighth I'm sure its valuable also.
As far as everyone addressing the launch rpm's why don't we address what comes before the launch? The burn out. Are you doing it and on what kind of tires? How are you doing it? If your tires are not hot then you need to signifigantly lower the rpms at launch, closer to 3000
MECP 1ST CLASS
FF08 FASTEST OVERALL TRACK TIME