So, I got out to Race Wars first 1 mile pavement event last weekend. Race Wars is a group that has been doing 1/2 mile roll racing for a few years, almost exclusively in Arizona if I'm not mistaken. This event was held at Springerville's Municipal Airport in Arizona... about 7000' up in the White mountains.
The event was nice... mostly cars, and around 10 bikes. The S1000RR and the Hayabusa were well represented, and a couple of Kawi's to boot. The event was both 1/2 mile side-by-side roll racing AND 1 mile standing start. The runway was super nice out to the half mile, and then a little choppy from the 1/2 to the 1 mile. Shutdown was a little tight at 2700 feet long after the mile, but it turned out to be a non-issue with the headwind helping matters there.The weather was clear, bright, with absolutely evil headwinds that averaged a SUSTAINED 20-30 mph by the middle of the day. The real fun was the density altitude clocking in at a cool 9400+ feet, with temperatures nicely in the 70's.
Sadly, it didn't all go exactly according to plan. I had to do a few control passes to 'license up' before I could run the full mile flat out, one pass with an exit speed in the 140-160 range, and then one pass with an exit in the 160-180 range. Those two went well enough at 160.2 (oops) and 178.6, but the bike was getting alarmingly lean... at one point it was 13.0:1-13.2:1 at 13psi! Freaked out by that I turned on the closed-loop control above 7psi and aimed for 11.5:1 and when out to do a full blast. The following pass had a 26mph steady headwind and it went 182 in the half mile... got onto a choppy part of the runway after that, and ended up off the ground over one spot at over 190mph! Granted it was only a couple inches, but the air gets up under the fairing at that speed and it is really spooky. Trying to get back on the throttle in the choppy section after landing just resulted in back-to-back headshake and one sloppy shift, so I aborted the run and went back to check datalogs. The AFR's were in the 12.0-12.2 range, but the injector duty cycle was in the 98% range and the closed-loop correction was maxed out. After the initial "WTF?!?" wore off I brought up the fuel pressure curve and found the culprit: 30psi of fuel pressure at peak boost (13-14psi), and it was an inverse line with duty cycle even with a 1:1 regulator in the system. Verdict: fuel pump or filter was toast, and my fun was over.... and very, very lucky not to have a lunched motor. I'd like to thank ceramic coated tops of pistons and water injection for that little miracle, because it sure in the hell wasn't 91 octane pump gas helping me there.
Overall I was a little bummed, but 180+ half miles speeds in that headwind on a street legal, stock wheelbase, pump gas, 11 year old bike built & ridden by some loon in his garage cheered me up pretty good. I think with some arm and no wind that I might be able to build a 200mph, HALF MILE street machine.... I guess that's next years goal for the 10R. :)
Attack life... it's going to kill you anyway.
Last edited by SpazOnaZX; 10-02-2017 at 01:48 PM.