afr fueling/ltft stft

[LuhReik]

can some please help me why my fueling is all over the place and my fuel trims are wacky
no matter how much i change ve my afr jumps around whenever

running a literal straight pipe no muffler
not sure if air could be sucking back in and throwing my fueling off

5.3
th350
4 ft straight pipe running straight out off headers
33lb injectors
vaccum ref regulator

long tube headers
222/232 112+5LSA 550/550 cam

[edcmat-l1]

First off, you need at least 1 bend after the O2 sensors. Needs to be at least 45 degrees, 90 degrees would be better.

Second, you need to know what "normal" looks like. Your AFR in closed loop is going to bounce around continuously. It's not going to stay stable. It's supposed to toggle lean-rich-lean-rich. Slightly below stoich to slightly above. That's normal. +25% LTFT is too far off but you can't make adjustments and expect them to be correct with just straight pipes.

[LuhReik]

First off, you need at least 1 bend after the O2 sensors. Needs to be at least 45 degrees, 90 degrees would be better.

Second, you need to know what "normal" looks like. Your AFR in closed loop is going to bounce around continuously. It's not going to stay stable. It's supposed to toggle lean-rich-lean-rich. Slightly below stoich to slightly above. That's normal. +25% LTFT is too far off but you can't make adjustments and expect them to be correct with just straight pipes.

Well said thanks for the info