J
jhillam
Active member
I have a powderlites kit on an 08' Nytro and mine has intermittently done this since my first ride out this season (previous owner didn't tell me about the problem). It seemed like it was going lean past half throttle and it was wierd that I could run down a field at 12 psi boost at 90 mp half throttle and if I pushed the throttle even a tiny bit more, A/F would jump to 13-14-15+, it would fall on its face and start popping, and letting off the throttle would immediately restore clean acceleration. I checked around and was generally notified that the stock injectors were too small for the Nytro. I consulted Powderlites and Boost-It, for improved fueling solutions, and I liked the Boost-It philosophy a lot better. I also had seen a Boost-It fueled nytro tearing it up on the snow and knew that was the way I wanted to go.
I got the Boost-It kit, pulled off Powderlites RB3, and installed the Boost-IT kit. I have better bottom end throttle response with the Boost-IT kit than I ever did with the RB3, and I can dump enough fuel to always keep A/F down to 12, but now I can't even get above 7300 rpm no matter what I do. It is almost like something is drawing too many amps at open throttle and robbing electricity from spark, fuel pump, and/or injectors. And it seems that now that I am pulling more power to run the auxiliary Boost-It injectors the problem is worse. The only person I have ran into that could immediately relate with the problem was Val Simmons who sets up Propane fueled Turbo Nytros. He had one come back that did the same thing and after replacing several things in sequence, he swapped out stator and wiring harness and the problem went away. It might be that at higher voltage levels some wire in the harness is arcing and decreasing the amperage available to devices the circuit? I just don't know. In trying to replicate it in the garage I can slightly depress the throttle just enough to turn the TORS on and it will begin to misfire periodically. The A/F readings stay right at about 13 even when the audible misfire occurs. In spite of the evident misfire I can generate full boost in the garage with only a light touch on the brake and a quick pressing of the throttle.
I have the sled set at 12 psi boost right now, I have a new exhaust, I have no leaks in my intake plumbing. I have good compression. I have new fuel lines throughout. I have no fuel kinks. I have high-flow ends on the fuel rails. I have brand new spark-plugs (even swapped them mid-ride yesterday to no avail) and I have proper A/F ratios under all throttle positions and all loads.
Taking Val's lead, I went and bought a brand new full wiring harness (hefty setback). I am going to install it this week, along with all the soldering that will have to be done for A/F gauge and Boost-It kit, and I'll try to go up this next weekend with another Nytro to pull and swap parts with until I nail it down. If it is the wiring harness, it'll be a little easier to stomach the expense
