Hello all new member been around awhile but just got on. I have an 07 that I just built and I have an issue with pinning the throttle. It will pull to 6200 and fall completely of the map till 65,6600 and then come back but it has no power. It I gradually get in it it pulls all the way to the limiter. Any ideas that might help.
07 with 12.5 to 1, Webb 4 cam, +3 throttle body, +1 valves, 105.5 cylinder, pc5 with fuel and timing, fast intake, barkers and on E85.
I have seen injectors that failed to fire properly causing a lean condition under heavy acceleration. It sounds to me like the engine is staving for fuel. I would go to the in field adjustment portion of the pc5 software and move the mid and high sliders up say, 3 clicks and see if it helps. If it does, continue to slide them up until you see black smoke on a free rev, then back them down just slightly until you don't see smoke anymore. This is NOT a replacement for dyno tuning but rather a testing exercise to see if lack of fuel is the issue.
We had it on the dyno and it would do it lean or fat it did not matter what we did it still died off. The only thing I did not try on the dyno was the gradual pull, where it pulls all the through with out a hitch. It just does it when you pin the throttle.
Gotcha, have you taken the throttle positioning sensor off and checked it at all positions(gradual rotation looking for spikes or dips in the continuity)?
I did not take it off but I used the PC5 to check the voltage all the way through idle to pin and it is fine no spike or drop all in range. Do you think it possible the programmer bad?
Ok I took the TPS out of the bike and tested it. At idle it omh's fine at wide open it is fine and it does not have any spikes when you go fro idle to wide open.
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