Left/Right discrepancy in LTFT

[DSteck]

My car is a 2006 Z06 with an intake, ported throttle body/intake manifold, long tubes, and a big cam.

I have tuned the MAF for the LTFTs, so they are between -2% and 0% in all ranges when they are fully matured. However, my bank 2 reading will be in the -5% or -7% area while the bank 1 reading might be +2% or 0% while the car is idling or at very low rpm and throttle. When I am cruising at 1800rpm or higher at a decent load, they tend to even out to within 2-3% of each other (this is after driving for a long time at the new rpm/load condition so that the LTFTs have time to change). I also notice that the voltage on my bank 2 sensor doesn't fluctuate near as much as my bank 1 sensor, but when I'm in the higher rpm steady state condition, both sensors cycle perfectly in sync with each other (and consequently, the STFTs cycle in the same pattern, although the phase is slightly off). Should I be worried that at low load conditions, there's a big right/left split? What can cause this? Should I look into replacing the O2 sensors? Any insight is greatly appreciated!

[JANNETTYRACING]

My car is a 2006 Z06 with an intake, ported throttle body/intake manifold, long tubes, and a big cam.

I have tuned the MAF for the LTFTs, so they are between -2% and 0% in all ranges when they are fully matured. However, my bank 2 reading will be in the -5% or -7% area while the bank 1 reading might be +2% or 0% while the car is idling or at very low rpm and throttle. When I am cruising at 1800rpm or higher at a decent load, they tend to even out to within 2-3% of each other (this is after driving for a long time at the new rpm/load condition so that the LTFTs have time to change). I also notice that the voltage on my bank 2 sensor doesn't fluctuate near as much as my bank 1 sensor, but when I'm in the higher rpm steady state condition, both sensors cycle perfectly in sync with each other (and consequently, the STFTs cycle in the same pattern, although the phase is slightly off). Should I be worried that at low load conditions, there's a big right/left split? What can cause this? Should I look into replacing the O2 sensors? Any insight is greatly appreciated!

IMO, if they vary more than 10% then replace the sensors, if not don't worry about it.

Cam, Long tube headers, and other mods can affect how the reading are being picked up by the sensors especially in the lower RPMs.

Ted.

[EC_Tune]

Yeah it's not terribly unusual to have a little L/R discrepency but like was said above, if it's more than 10% there is an issue that needs to be resolved.

[DSteck]

Thanks for the responses. I will keep an eye out for a discrepancy greater than 10% between left and right.