I understand it’s the throttle that blips not the timing. What I’m saying is that changing mbt changes the torque calculation. If it thinks timing is well below mbt then it will open the throttle more to compensate and achieve desired torque, but now its making more torque than desired because the actual timing is closer to actual mbt.
One way I’ve seen this issue band-aided by others was zero’ing out the coastdown shift map. It’s not the correct solution but it could at least mask the problem.
If it were me, I would immediately put all the mbt tables back to stock and test it out. If I’m wrong; I’m wrong, but it’s a super easy test to at least rule out the most likely culprit and only takes like 15 minutes to try. It’s the only thing you listed that changed that could have this effect. If it works, then you can always just add to mbt at the higher loads and rpm.
If I do a dedicated e85 tune, I’m going offset all mbt tables by ford’s e85 offset and max out all the borderline tables. I believe that’s the most technically accurate way to do it short of doing a lot of dyno testing to verify ford’s mbt is accurate.
