Ftc scale changing at wot turbo trailblazer

[92tsiawdguy]

Ive been having this weird issue with my turbo trailblazer. Anything above 19psi will cause my truck to misfire or go lean at wot after a shift(according to the wideband) Im not 100 percent sure its a misfire but it feels like its bogging and sounds like it also. Ive gapped the plugs down to .020 from .022 with no change. I have a base pressure of 50psi and at wot it raises 1 to 1 with the boost. I know its not fuel related. Wideband reads 11.5:1 at wot then after a shift it goes to 12.6:1 durning the bog and then back to 11.5:1. The FTC table is changing from 1 to 9 when this issue happens. Ive had a few people look at the logs and tune and they cant figure it out either. The setup is a sbe ls2 with id2000 injectors, dual 450 pumps, e85, an 85mm turbo and turbo cam. Any help would be appreciated.


kyles turbo tbss 10 max timing modified shift pressures.hpt
2-3 lean pull.hpl
LS3 MAF + VE LC-1.cfg

[mowton]

No wb in log? stuck at 10.21

Ed M

[92tsiawdguy]

No wb in log? stuck at 10.21

Ed M

Yea the output on my wideband is not working correctly. But you can see the issue. Anytime the o2 mv drops is when im having the issue

[GHuggins]

Reason why your running a .020" plug gap? I would think .030" should be gapped tight enough? Other than this, has anything else on the tune or engine changed before the problem started?

[92tsiawdguy]

Nothing else had been changed other than the boost level. With the o2 voltage dropping it leads me to believe I have a misfire at wot after the shift. But i could be wrong.