Hey folks, here's my new low-buck project. I started this build (in 2015) with a bunch of extra parts I had lying around - a ZX10 frame, GSXR wheels, Busa fork, and a hurt Gen 3 engine I bought for $100 off Craigslist. After putting in a good Gen 2 crank I had and going over the Gen 3 engine, I could never get it running. It would try to start, but I think there is either a harness imcompatibility, or the tooth pitch on the crank / clutch basket changed. I sent out the Gen 3 crank to be repaired, and planned to swap it out and try again.
Life got busy, I worked on my house for a year, had some other delays, and finally got back to this project a few months ago. I found a running Gen 2 engine for $700 locally and put it in the chassis. Started right up, yay, back in business. I'll rebuild the Gen 3 engine and have it as a spare when I melt this one
Eventually, I plan to run E85 and nitrous, but for now I will try to work out the kinks with a stock engine and E85. I plan to use pails of VP C85 and not worry about pump fuel quality.
The fuel system uses a stock injectors (410cc), a Walbro 255lph pump and Aeromotive regulator. The idea is to flash the ECU for E85 at 43psi, and fine tune with a PC3. When it gets sprayed (dry spraybar), I will Y off the nitrous solenoid and knock it down to 25psi or so with an old Carolina Cycle regulator and feed that into the boost reference port on the FP regulator. I’ll figure the fuel/nitrous ratios by weight before testing on the dyno. I kinda like the idea of a mechanical fuel bump, as long as I can get the ratios right. Less electronics, I want to keep the bike simple, just a WEGO wideband for logging and a PC3 for tuning.
Once the bike is set up, I’ll build the engine for 75hp worth of spray. The fuel system should be good for 250hp on E85 if the injectors can handle 70psi reliably. With a 5lb bottle and a safe tuneup, I should be able to spray for a whole mile
Dean