There is a balance between performance and safe tuning. At Tapout we have found that most ATS-Vs achieve the best combination of these attributes with wide-open throttle (WOT) air/fuel ratios somewhere between 11.8:1 and 12.8:1. Typically we target 12.0 to 12.5:1 on most remote tunes. We set the target range, and all remote tuned cars will be in this vicinity. But every car is different, and in most cases additional improvements can still be found. For customers who want even more performance out of their ATS-V, a wideband oxygen sensor can be installed and we can dial in your particular car perfectly. Each and every ATS-V has its own slight variances, and adding this sensor allows us to pinpoint what those are, and how to best adjust our tune for them.
12.5:1 WOT air/fuel ratio equates to 0.85 λ. See the image below for some data from a remote tune we worked on earlier this week. The green areas are low load where stoichiometric should show 1.00. The red areas are under boost where we tuned for 0.85 λ. This customer has installed a wideband and you can see that we have his WOT air/fuel ratio calibrated within one to two percent of perfect across the board.
HP Tuners data logging can accommodate any wideband oxygen sensor that has an analog output. If you’re running the latest MVPI2 interface you’ll need to upgrade to the Pro Feature Set. The wideband itself can be installed in either downpipe. If you want to get really fancy, you can install a dual channel wideband and we can skew your injectors by bank for fueling perfection!
Feel free to contact us at Sales@TapoutTuning.com with any remote/custom ATS-V tuning questions you may have, we’re always here to help the community.
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