The NGK R2558E-10 (stock number 97278) is a heat range 10 iridium racing spark plug, a popular choice for high-boost, built Nissan R35 GT-R VR38DETT engines. It is built to stand up to harsh race-engine conditions, with a fine-wire iridium center electrode for strong ignition, long life and fouling resistance.
Buy one plug for $40, or a set of 6 (a full VR38DETT set) for $240.
Specifications
- NGK part number: R2558E-10 (stock #97278)
- Heat range: 10
- Thread: 12mm x 1.25 pitch
- Reach: 26.5mm (1.04")
- Hex: 14mm (9/16")
- Center electrode: 1.0mm fine-wire iridium, recessed projection
- Ground electrode: single nickel, slant
- Gap: 0.028" (0.7mm)
- Seat: gasket
- Terminal: solid
- Resistor: yes, 5k ohm
Features
- Insulator nose designed for sharper throttle response
- Corrugated ribs help prevent flashover
- Alumina silicate ceramic insulator with a copper core for heat transfer
- Triple-sealed against combustion gas leakage