RB25DETT Tuned to 400HP at Motorworx – Haltech ECU Magic
There’s nothing quite like unlocking the true potential of a single-turbo RB NEO engine—and this RB25DETT is a perfect example. Tuned by Steve @ Motorworx and running a Haltech Elite ECU, this beast can now put down a solid 400+ horsepower on high boost and 370 on low bost, and it’s as responsive as it is raw with its unique Tomei Turbo OEM bolt on in its low mount position.
The Setup
The RB25DETT is often overshadowed by its bigger brother, the RB26, but with the right setup, it’s a seriously capable platform. This engine came in clean and ready, but we knew there was more to be had with the right brain behind it—enter Haltech.
We opted for full Haltech engine management to take control of fueling, ignition, and boost. The ECU offered the flexibility and reliability needed to extract maximum performance while ensuring safety across all operating conditions.
The Tuning Process
The car rolled into the dyno at Motorworx, where we began by setting a solid base map. From there, we fine-tuned fuel delivery, adjusted timing for peak efficiency, and refined boost control to balance power and drivability.
Throughout the session, we closely monitored multiple channels live whilst tuning namely:
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Fuel pressure
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Boost pressure
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AFR (Air-Fuel Ratio)
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Oil pressure & temperature
Thanks to the Haltech ECU’s data-logging and real-time adjustment capabilities, we were able to find that sweet spot—where performance meets reliability.
The Result? A Clean 400HP +
There’s something satisfying about hitting a round number like 400hp, but this wasn’t about chasing a number—it was about smooth delivery, strong midrange torque, and a healthy safety buffer which heaps more room for scope.
The power delivery is linear and confident, with the Tomei Single turbos spooling quickly and holding boost strong all the way through the rev range. Whether it’s for spirited driving or weekend pulls, this R34 NEO RB25DETT is ready.
Final Thoughts
Over the nearly 3 decades it’s always a pleasure tuning RBs, but this one stood out for how well it responded to changes. Even with the original Nissan ECU with its FCTuningNistune ECU Solution, which got things initially going. Now with Haltech providing the brains, and Motorworx providing the tools and environment to get the job done, the result is a well-balanced 400hp street car with tons of personality.
Got a project in mind or want to wake up your own RB? Get in touch.