RB-X GT2 & RB28DET
The RB-X GT2 (designed and built by REINIK) is an engine specially made for the NISMO 400R. The difference between this engine and a RB26DETT is that the engine is bored and stroked (87.0 × 77.7 mm) which results in 2771 cc. Engine produces 450 PS (331 kW or 443 HP) at 6800 rpm and 47.8 kgf·m (469 N·m or 347 lbf·ft) at 4400 rpm.
This engine was manufactured with a reinforced cylinder block and cylinder head, metal head gasket, pistons with cooling channels, forged crank shaft, forged connecting rods, N1 turbine with reinforced actuator, high flow air cleaner, stainless down pipe, and low air resistance sport catalyzer, most of which were not offered for the RB26DETT. RB-X GT2 engines competed in LeMans 24hr race, Pikes Peak, and other forms of motorsports. GT500 and Z-tune engines are also based on REINIK's design although later built by NISMO's Omori Factory.
REINIK also made over 20 RB28DET based on the R33 RB25DET. These engines were ordered by Prince Nissan Dealership network for a special edition R33 GT25t called 280 Type-MR. The engine was built for high torque and limited to 300 PS (295 hp) and 261 lb.ft of torque.
Read more about this topic: Nissan RB Engine