The electronically controlled throttle allows computers to program a more precise throttle opening compared to a traditional cable that stretches over time.
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The technology is widely used in motor racing globally, including Formula 1 where both fly-by-wire and brake-by-wire are used.
Fly-by-wire has been long-mooted for the Virgin Australia Supercars Championship, even as far back as Car of The Future in 2013.
Fly-by-wire was trialled by Triple Eight Race Engineering in its converted Holden Sandman Supercar wagon.
Among details revealed by Supercars in its recently released tenders was confirmation of a 2765mm wheelbase and 2000mm track/width.
Engines will be capped at 600hp, a further drop of 35hp after Supercars lowered horsepower levels at the beginning of 2020 from 650hp to 635hp to cut costs.
Gen3 will use controlled front and rear suspension componentry and will continue to use an 18-inch by 11-inch wheel.