The actual blog for BlackBetty has piles of info too. http://thevx4.wordpress.com/
Kinda comparing two vastly different machines... BB is hands down, one of my favorite builds of all time, but don't think it's really relevant to this thread. Seen the vids, read the blog, seemed tuned for maximum acceleration while trying to maintain a constant rpm. For the purpose it was built, track racing, not long WOT straight blasts for max speed.
I've only seen some video of JJ's bike, but I must say. That thing looks mind blowing fast. I'd love to see what it could do on a run like this.