TUNING THE NISSAN RB25DET (R33)

The Nissan RB25DET in the R33 Skyline is a 2.5-litre single-turbocharged inline-six engine with excellent tuning potential. The R33’s chassis refinement and the RB25’s smooth power delivery make it a satisfying and capable platform to develop.

FC Tuning carried out a full ECU remap on this R33 RB25DET using our Nistune ECU solution. We optimised fuel, ignition, and boost maps on the rolling road to achieve safe and reliable power gains suited to the car’s build specification.

The R33 left the dyno with a strong improvement in power output and improved throttle response throughout the rev range — a well-mapped RB25DET that excels on road and track.