Fuel Trim VS Wideband VE Tuning problem

[sikgmc]

I tuned a 2006 H2 yesterday. I started tuning the VE with fuel trims and then switched to my wideband to compare. I bstarted with a stock VE table both times. Why is there a difference in the direction the VE table gets adjusted between fuel trims and wideband tuning? Seems like the fuel trims made mountains while the wideband made valleys.

Here is the stock VE table


The first pass with fuel trims


The first pass with wideband

[WS6FirebirdTA00]

it depends on cell count, how new the o2s are, and how the tune was setup for each. Honestly looks like it was tuned off bad data.

[Rhino]

Also, notice that the scales on both graphs are different. Could that have anything to do with it?

[WS6FirebirdTA00]

Also, notice that the scales on both graphs are different. Could that have anything to do with it?

No.

[sikgmc]

Wouldn't fuel trims and wideband see the same thing? So if the engine was rich, they both would modify the VE table in the same direction?

[WS6FirebirdTA00]

it depends how good the data was you were tuning with and how good the sensors themselves are.

[sikgmc]

I am using a Innovate LM-1, and never ran into this issue. Usually the fuel trims and wideband data are similiar, not opposite. I asked the guy that owns the H2 to come back after a week of driving so I can retune the VE and MAF to see if anything changes.

[WS6FirebirdTA00]

could be bad o2s on the car, most probable cause.

[sikgmc]

Not sure. I am going to retune it on Monday and see if I get the same 2 results.