Fuel trims

[AJP turbo]

Metro are u sure you are reading steady state stft's?...with a stock vehicle its highly unlikely that the fueling is that far off...i would look to a mechanical issue...its not uncommon to get spikes in fuel trims while in transient and when pedaling the car...hold the pedal steady and after a second or 2 the fuel trims should level off

[metroplex]

I'm reading LT+ST vs time. I'll try to post some pics to describe what I'm seeing. I also plotted on VCM Scanner's table LT+ST vs RPM and Load in different cells. I'll compare the tuned Mustang GT against the stock Taurus SHO. I will mention that I used a "canned" value file for my Mustang GT's Steeda CAI which was perfectly good enough to drive around without any problems, but the untuned fuel trims looked like my stock SHO.

[metroplex]

These are just from Bank 1 for each respective car. If you look at the SHO graph, the LT+ST data spikes around but I'm more interested in where it is centered.

I also attached the GT data before it got a tune (GT2.jpg). At the time before the tune, all I had was the Steeda CAI value file sent from Steeda for my CAI. It was good enough to not cause any problems while driving.

[metroplex]

I went to the drag strip and got some better data. Above 5k RPM, the actual lambda dips down to .8 while I command 0.85 at WOT

No limiters are active and I made all of the min lambda settings 0.85, and its not the COT