Bangin it out

The GSX finally made it to the dyno today, we took it to Andy at Junction33 near Lancaster, he uses Dynojet's latest 250i dynometer. He was able to hook up the dyno's lambda sensor to give accurate air/fuel mixture reading and a pickup sensor to get engine rpm's.

Anyway ... the first few runs showed the bike to be running quite lean and had a misfire at high rpm's so the main jets were changed from 122.5 to 130. I also had to re-tighten a few bits that had decided to vibrate loose during the first run, this thing is seriously loud indoors and shakes everything, including the room. So nuts and bolts, unless fastened with loctite or nylock nuts just come loose.
The next few runs using 130 mains were better but still a bit lean and still a small misfire at high rpm's. So we tried 136 mains, this time we got a more power and a better air/fuel ratio. The misfire still seemed to happen but Andy thought it was reaching the rev limiter and according to the graph was still making power. So i removed the RPM chips from the 2-step and we tried once more......
This time it seemed to go well, power was up A/F right and no real hiccups.
A standard GSX should make 110hp so i was kinda hoping that it would make 130-135hp, but was surprised to see the graph. 158hp, thats all engine ... no nitrous. MUCH more than expected.
With the jetting sorted we went for one more run using nitrous. I have the program on the Schnitz box set to come on 1 second after being activated and to start at 25% building to 100% over 4 seconds. The jets in the nitrous are set for 36hp.

The following graphs speak for themselves......



186.4bhp and 118.4ft-lbs of torque
And here is the last run, thanks to Sam for filming, he was only shaking due to the cold ... apparently :D

And heres the first few runs (via youtube)