I just put a competition cnc ported head on my 09 busa. it already had a 1441 and web 395/378 cams along with some other things. 705lb combined bike and rider weight. I wanted to see how much it helped. Got it done right at the end of the year so I only did one race at sea level and one at the home track at 2,800'. I don't know what the actual corrected altitude was, but it was really humid and bad corrected altitude I was told when I went to sacramento. sea level track or close to it. I ran a best of a 8.88 at 158mph with a 1.48 sixty foot late one night. Most passes were a 1.50-1.54 sixty and 8.92-8.95 at 155-157mph.
ran at the home track at 2,800'. I wish it was a e.t. day. I ran 3 1.51 sixtys in a row and then 3 1.53 sixtys in a row. Not the greatest, but consistent as hell. best of 9.013 at 154 first thing in the mourning.
9.013 @ 154
9.076 @ 153
9.084 @ 152
9.052 @ 153
9.074 @ 153.5
Then I tried a nitrous run. havn't ran nitrous in two months and hadn't used it since I put the head on. I should have turned the nitrous down, but I left it the same as the last time I used it. I had to chop the throttle in first, choped it in second, rolled off and rode it out in 3rd and then full throttle. slowest pass of the day. 9.17 @ 168. It was fun though.
The bike seems to make more power and wheelies alot easier in first and second, but the 1/4mph did not come up a whole lot. Maybee I exptected more. I will have to wiat to see how it goes untill next year now.
I made 4 passes against a 2011 busa with exhaust and stock engine. Simular combined weights, wheelbase, and sixtys. he was 144-145mph on the same day and same time as my 153-154mph passes.