Not all weight you remove is always beneficial, on my 73 duster removing the Rear bumper reinforcement (about 13 pounds 4 feet back from The axle cl) actually hurt my 60 foot times. 13 pounds 4 feet back has the dynamic leverage of 52 pounds only 1' back.....so dynamically that 13 pounds did an extra 39 pounds of 'good' planting the tires on the launch. Every .01 you can drop on your 60 is usually worth several .01 in the 1/4, depending on your weight.
I'm having a hard time with this...was your car spinning the tires after removing the bumper reinforcement? And if so, did you do anything to loosen up the front end to get more weight transfer?
BTW a tenth gained in 60' is typically worth 1.5-2 tenths in the 1/4...
In the past I added rear weight that helped as well. Now I'll take weight off anywhere. There's stuff a lot faster and more nose heavy than mine that hook on 10.5s. Just a matter of figuring out the suspension. Nobody said it was going to be easy Doug.
