Turbo Sigma

Turbo brochure.

This time Mitsubishi Motors approached Normalair-Garrett to produce a turbocharged version of the GH model (yet another first for an Australian built car). The Sigma Turbo was released in late 1981 and was available in three colours, red/black, silver/black and blue/black. The engine was the 2.0 litre Astron with a Garrett Air Research T3 turbocharger and Zenith CD carburettor. Compression was reduced to 7.8:1 with boost running at 10lb. This increased power from 64.4kW @ 5200rpm to 116.0kW @ 5200rpm. To assist cooling two bonnet vents were added, as was a unique "egg crate" grille. On the inside a "turbo boost" lamp was incorporated into the dash so the driver could tell when the engine was on positive boost.