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The wiring diagram above is from Nissan engine RB26DETT and it is useful to your Skyline GTR R33 electronics enhances. This Nissan RB26DETT describe wires parts connection from ignition coil relay, ECCS relay, diagnosis connector, CHK connector, AAC valve, air flow meter, thermo amp, etc. The RB26DETT engine block is made from cast iron, and the cylinder head is made from aluminum. The cylinder head contains 24 valves (4 valves per cylinder), and uses a dual overhead camshaft setup. The intake of the RB26DETT varies from other RB-series motors in that it has 6 individual throttle bodies instead of a single throttle body. The engine also uses a parallel Twin Turbo system.