Commodore VT — Stage 2 ECU Tune
- 57% power increase to 132kW
- 65% torque increase to 205Nm
- improved fuel efficiency
- optimised boost control
- enhanced drivability
- engine break-in calibration
The customer brought a 1999 VT Commodore with a 355 stroker conversion already in place, along with a camshaft upgrade and roller rockers. Factory EFI was dropped in favour of a Haltech Elite 2500, which gave full control over fuelling and ignition timing on 98 RON. High pressure fuel pump and injectors were sized to match the new combination.
The dyno sheet came back showing 132 kW at the wheels, up from a baseline 84 kW, with torque lifting from 124 Nm to 205 Nm. The stroker's extra cubes and the revised valve train made a clear difference once the tune was dialled in. The Elite 2500 calibration allowed proper management of idle quality and part-throttle driveability without the compromises you'd see with a piggyback or chip.
Boost solenoids and a wastegate are listed in the build spec, though boost pressure wasn't recorded—likely prep for a future turbo install or already fitted for off-road use. Either way, the Haltech platform leaves room to build on this file when the next round of hardware arrives.
Why fit a standalone ECU to a naturally aspirated build?
The factory ECU can't cope with a stroker engine and non-standard cam timing. The Haltech Elite 2500 provides proper fuel and ignition control for modified engines and leaves the door open for forced induction later.
Are the boost solenoids and wastegate in use on this tune?
The boost figure wasn't recorded, so it's unclear whether a turbo is already fitted or these parts are staged for a future install. The calibration file can accommodate either configuration.
Is this legal for street use in Australia?
Modified emissions equipment and standalone ECUs typically require engineering certification for road registration. This calibration is supplied for off-road and closed-circuit competition use.
Workshop & Dealer Access
Protunes supplies ECU calibration files exclusively to approved workshops, tuners, and dealers throughout Australia. Platform: Haltech.
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