Original Nissan GTR as well as other Skyline spark plug. Range 6 NGK plug. In turbocharged engines, choosing the correct spark plug heat range is critical due to the higher combustion pressures and temperatures created under boost. Heat range directly affects how efficiently a plug can transfer heat from the firing tip into the cylinder head, which in turn impacts engine reliability and performance. For most lightly boosted or near-stock turbo motors, a heat range 5 plug is often sufficient. It provides a good balance by keeping the plug hot enough to prevent fouling during normal driving, while still offering reasonable protection against detonation under moderate boost. As power levels and boost pressure increase, moving to a colder plug such as a heat range 6 becomes necessary. This colder plug is better at dissipating heat, reducing the risk of pre-ignition or knocking during hard acceleration or sustained high-load conditions. For heavily modified or high-boost turbo setups, a heat range 7 plug is recommended. The colder design ensures maximum heat dissipation, offering the protection needed in extreme performance applications where combustion temperatures are at their highest. Using too hot a plug in a turbo engine can cause pre-ignition and potential engine damage, while choosing the correct colder range ensures safe, consistent performance under boost.
- Sold as each, 6 required.
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