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We used commercial tuning software, HPTuners, about $500. The Volt engine is VVT so it's just a matter of tweaking the cam timing. We used a 2017 Buick Encore turbo for a base tune and kept the exhaust cam around .5° and increased the intake cam a couple deg where we were going more lean. Then we had to add a LOT more spark. It was a gradual thing, go a little lean, and when the engine wouldn't stay at that rpm, adjust cam and spark to make a little more power.
There's no way to do it without a custom tune. You're not going to do it by tweaking sensors.
In theory, the HPT licenses used cost about $100, so if you had access to the software, you wouldn't have to spend the full $500. You get 10 licenses with the HPT package.
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2018 Chevy Volt
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