The post TUNING THE NISSAN RB26DETT (R33GTR) first appeared on FC TUNING.

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:

• Fuel pressure

• Boost pressure

• AFR (Air-Fuel Ratio)

• 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.

The post TUNING THE NISSAN RB25DETT (R34GTT) first appeared on FC TUNING.

The post TUNING THE NISSAN RB25DET (R34GTT) first appeared on FC TUNING.

It was a pleasure to behold this mint-condition R34 GTT, which now boasts a GTX3076R turbo. The owner was just looking at response and around a comfortable 450bhp on light boost.

Remarkably, it remains on its stock block but it has been updated with an FCTuningNistune ECU Solution. This upgrade ensures the car retains as much of its original functionality as possible.

Nistune integrates seamlessly with these R34 models. For this particular one, I’ve incorporated:

• Flex Fuel capabilities (preparing for future modifications)
• Boost Limit Control
• The retention of the OEM knock control
• Launch Control.

Stay tuned for more exciting updates on our #FCTuned series!

The post TUNING THE NISSAN RB25DET (R34GTT) first appeared on FC TUNING.

The post TUNING THE NISSAN CA18DET (S13) first appeared on FC TUNING.

Great work Alex. Got there in the end mate.

See you soon for more ponies

The post TUNING THE MAZDA MX5 (CA18DET) first appeared on FC TUNING.

Its always nice when you have had the pleasure to have been modifying an owners car from OEM, as it were my own, and being allowed to just go with what I would do and spec it out.

This once factory GTT with its still STOCK engine is just an example. Once tuned with an FCTuningNistune ECU it was time to try something different the moment Haltech released their Platinum Pro Plug in range many years ago.

This wonderful owners Nissan Skyline R34 GTT was the first in the UK to have received such a unit. Not wanting to disturb the OEM wiring it made sense to avoid the Platinum Sport Series, which is what I would typically recommend all the time if things are in check and there are no heavy weight modifications or engine swaps.

Fitted with a now upgraded custom made manifold to suit the design and style of the bigger an advanced Borg Warner EFR Series Turbo (7670), internally gated and upgraded fuel system, I decided to leave the block stock as I know with good tuning they are more than capable and I know the car since its days of being imported into the UK. Plus this isn’t the kind of car to be spanked too hard on the track. Just spirited driving on A and B roads with the odd high speed Autobahn.

Naturally, there were other supporting mods in the form of exhaust and injectors etc.

What one ends up with is a vehicle that is still a pleasure to drive, makes more power, is even more economical (as reported by the owner himself) but yet has a kick to make anyone grin once the turbo comes up. Enjoy my friend and look after her.

The post TUNING THE NISSAN RB25DETT (R34) first appeared on FC TUNING.

The post TUNING THE NISSAN SR20DET (S14a) first appeared on FC TUNING.

Still on the stock turbo for now as it’s a daily runner but maybe a little more power in the future.

The post TUNING THE NISSAN RB25DET (R34) first appeared on FC TUNING.

Future mods to include an even bigger turbo capable of 600 + hp which will really turn this nice winged GTST into a fast road weapon.

More to come so watch this space.

If you like your Nissan Skylines remember to hit that LIKE button below and Share to a friend.

The post TUNING THE NISSAN RB25DET (R33) first appeared on FC TUNING.

More power to come once the turbos and MAFs get upgraded.

Remember to hit the LIKE button below

The post TUNING THE NISSAN RB26DETT (GTR) first appeared on FC TUNING.