Subaru Performance Tuning
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Subaru WRX
Subaru STI
Subaru Forester
Subaru Outback
Subaru Levorg
Subaru Impreza
Subaru Legacy
Subaru XV
FA20 turbo boxer
FA24 turbo boxer
EJ20 turbo boxer
EJ25 turbo boxer
FB naturally aspirated boxer
If you have a specific question regarding your Subaru that is not answered here, please give us a call or submit the enquiry form because we can help - we will assist you personally.
Yes, when calibrated carefully and run on quality fuel. Subaru boxer engines are generally robust, but the EJ-series in particular benefits from conservative boost targets and careful knock management. We run all Subaru tunes on 98 RON and log knock sensor activity and AFRs throughout the rev range before finalising the calibration. The FA20 and FA24 in the current WRX are better-behaved engines with more consistent knock response, making them very strong tuning platforms.
We strongly recommend 98 RON for any tuned Subaru, particularly EJ-engined STIs. 95 RON is the minimum for a tuned WRX, and even then the calibration is more conservative. New Zealand's Z, BP and Gull 98 are all fine. Avoid E10 blends on older EJ engines unless specifically calibrated for it. The performance difference between 95 and 98 RON in a tuned Subaru is noticeable - you'll feel the ignition timing advance and the engine pulling more cleanly at higher load.
A current WRX with the FA24 engine typically gains 35–50kW and 80–110Nm on Stage 1, taking it from around 202kW to 240–250kW. The previous FA20 WRX (2014–2021) gains a similar amount. Both respond well to 98 RON and see the biggest gains in the 2,500–4,500RPM range - which is where the WRX lives most of the time. An STI on Stage 1 gains 25–40kW, with larger gains available on Stage 2 with the right supporting hardware.
A catback exhaust alone doesn't justify a Stage 2 tune - Stage 2 typically requires a front-pipe or downpipe change (which reduces restriction) along with an intake. With a turbo-back exhaust and intake, Stage 2 on the FA24 WRX can deliver 55–75kW over stock and push past 260kW. If you've only done a catback, a Stage 1 tune is the right call. We'll assess your current modifications and recommend the appropriate stage.
Improve your Subaru's performance with expert ECU tuning in Auckland. Contact us today - we'll outline what gains your WRX, STI or Forester XT can achieve.
Real Drivers, Real Results.
We're proud of the results we deliver, but don't just take our word for it. Read what our satisfied customers have to say about their experience with our professional mobile tuning service and the real-world performance gains they've enjoyed.
Auto Tune were exceptional. Their attention to detail and deep technical knowledge were evident throughout the tuning process. They managed to unlock the hidden potential of my vehicle, providing a noticeable boost in power and responsiveness. I highly recommend their services to any enthusiast.
2018 Subaru Forrester - Howick
I was thoroughly impressed with the friendly and efficient service at Auto Tune. They transformed my car’s performance while maintaining reliability, striking the perfect balance. The difference in the driving experience is night and day, and the entire team was a pleasure to deal with. I will definitely be a returning customer.
2020 Audi RS6 - Takapuna
I brought my diesel ute in looking for more pulling power, and the team at Auto Tuning absolutely delivered. The difference in low-end torque is massive; it now hauls heavy loads up hills without breaking a sweat. The biggest surprise has been the improvement in fuel economy during my daily commute. A proper, professional tune.
2021 Ford Ranger - Henderson
