Why NGK Iridium? More Durability and a Higher Melting Point compared to Platinum, better center electrode anti-oxidation and anti-erosion, improved ignition, superior anti-fouling, lower required voltage, new metal shell plating process for better anti-corrosion. One Step Colder plugs are reccomended for cars with heavy modifications.
The SRT-4 runs standard heat Champion spark plugs, the...
Through the regulation of engine characteristics and the implementation of Denso-manufactured iridium plugs, racing plugs of two different thermal values have been made available at Spoon. The speed of heat escape is higher in plugs with larger thermal values, and consequently, such plugs are characterized by rapid cooling. Accordingly, a thermal value of 27 is recommended for high-load, circuit-t...