Ngk one step colder spark plugs

Description

NGK Iridium IX Spark Plugs are designed specifically for the performance enthusiast. Iridium IX offers extreme ignitability, improved throttle response and superior anti fouling.

The fine Iridium tip ensures high durability and a consistently stable spark. Iridium alloy has extremely high melting point, perfect for today's high-tech, high-performance engines. Trivalent Metal Plating - superior anti-corrosion and anti-seizing properties. Outstanding acceleration, high fuel efficiency and durability. Ultimate design, technology and performance.

These are one step colder plugs and are recommended for higher horsepower applications. A higher heat range number does not improve engine performance, it increases the plugs ability to dissipate heat.

Box of 4.

Specifications

  • Stock Number 2309
  • Heat Range: 7
  • Plug Gap: .032

What's Included

  • Box of 4 Spark Plugs

compatibility

  • 2006-2014 Subaru WRX
  • 2006-2020 Subaru STi

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What does 1 step colder spark plugs mean?

Why go “one step colder”? Running a “colder” heat range spark plug will reduce temperatures in the combustion chamber by wicking more heat into the cylinder head. This reduces feedback knock and fine knock learning when running gasoline tunes. Recommended on ALL 2.5 WRX/STI making over 280 whp.

Should I get one step colder spark plugs?

A modified engine with higher cylinder temperatures will usually need a colder heat range spark plug. Generally, for every 75-100 hp you add, you should use a one (1) step colder heat range to be safe and avoid pre-ignition. The plug gap may also need to be adjusted smaller to avoid misfire.

When should you run a colder spark plug?

Ignition Timing.
Advancing ignition timing by 10° will cause the spark plug tip temperature to increase by approximately 70° to 100°C..
A colder heat range spark plug may be necessary if the ignition timing has been advanced to near the knock level..