100-6 BN4 — Stage 2 ECU Tune
- Improved fuel efficiency
- Improved power output
- Improved torque delivery
- Enhanced throttle response
- Optimized engine performance
The 1957 Austin Healey 100-6 BN4 is a beautiful piece of history, but carburettors and points ignition don't suit Australian summers or modern fuel. This one received a full EFI conversion with a Microtech standalone ECU, fuel system optimisation, and proper ignition timing control.
The result is a car that drives like it should have from the factory. Workshop-supplied dyno figures show 87.2 kW at the wheels climbing to 106.6 kW—a gain of 19.4 kW—with 197 Nm of torque. More importantly, it starts hot, idles consistently, and runs clean on 98 RON without the usual flat spots and hesitation.
This calibration focused on driveability and reliability rather than peak numbers. Fuel delivery is stable through the range, ignition timing is mapped for pump fuel, and the tune accounts for heat soak during longer drives. A proper foundation for enjoying the car as intended.
Why fit EFI to a classic Healey?
Carburettors struggle with modern ethanol-blended fuel, heat soak in traffic, and altitude changes. EFI provides reliable cold and hot starting, stable idle, and consistent fuelling that suits daily or touring use in Australian conditions.
What ECU platform was used for this conversion?
The car runs a Microtech standalone ECU, which offers full control over fuel and ignition mapping while being well-supported locally for tuning and service.
Is 106.6 kW at the wheels realistic for a BN4?
Yes. The factory 2.6-litre six made modest power with carbs and basic ignition. Optimised fuel delivery, proper timing control, and modern pump fuel easily account for the 19.4 kW gain recorded on the dyno.
Workshop & Dealer Access
Protunes supplies ECU calibration files exclusively to approved workshops, tuners, and dealers throughout Australia. Platform: Microtech.
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