Gearing question

Something seemed a little odd regarding your rpm vs trap trap speed. I did a quick bit of math and noticed that the amount of converter/transmission slip was .7% on the first day at the track and rose to 4.08% on the second day. Just wondering if you noticed any additional slip lately and it may be something you want to check out.

It would seem that most of the 5/10ths that you did pick was in the first 60" and the remainder shortly thereafter, altough it would be impossible to tell without seeing the 330' times. I would think that was due to the reduction of wheel spin from the softer compound of the slicks, rather than the slight numerical advantage afforded by the shorter tire.

As 340Mopar said, I agree that you are somewhat overgeared for your combo and are running out of carb and cam, so you have two ways to overcome your present problem. You can drop your gear ratio numerically which will cut down some on your tire spin, increase your gas mileage if you care and give your vehicle better street manners too. Or, you could give it more cam and carb and go even faster, but you may have to bump up your compression ratio.

If you were to go with a gear change, a 3.90 gear would get you 120 mph in the 1/4 @ 6000 rpm w/ 0% converter slip or 6240 rpm w/ 4% converter slip. Assuming you have the power of course. :)