NGK Racing spark plug reference R7438-9 for CITROEN C4 WRC or FORD Focus 2 or MITSUBISHI Lancer Gr. A

NGK Racing R7438-9 spark plug for CITROEN C4 WRC, FORD Focus 2, MITSUBISHI Lancer Gr. A

Optimise your engine’s performance by choosing the right spark plug for your needs. Consider the electrode design, spark plug heat range, your engine’s level of tuning and racing conditions. Spark plugs with a high heat rating offer better cooling. Designed for modified engines, NGK racing spark plugs maximise power in specific conditions, especially in hot weather. They differ from standard spark plugs in appearance and performance, sacrificing longevity for efficiency at high engine speeds.

How to choose your NGK Racing spark plug:

1. Spark plug design: Refer to your vehicle’s manual to check the thread, diameter, length and gasket specifications.

2. Electrode design: A longer electrode improves the spark and ignition but is more prone to wear. Choose a design that minimises wear under the thermal and vibration stresses of racing engines.

• Projected type: Similar to standard spark plugs, they offer good performance for mildly modified and turbocharged engines at low and medium engine speeds.
• Square ground electrode type: Ideal for turbocharged engines, the short electrode withstands explosions better.
• Semi-surface type: The ultimate configuration, it avoids cracking and melting problems, although service life is reduced at low engine speeds.

3. Spark plug heat range: Choose a rating that keeps the electrode at an optimum temperature, even in extreme conditions. A high rating improves heat dissipation, not performance.

4. Resistors: Performance varies between spark plugs with and without a resistor. Some engines require resistor spark plugs to avoid problems.

Compatibility: Suitable for various models, including CITROEN C4 2.0 16V Turbo WRC, FORD Focus 2.5 20V Turbo, MITSUBISHI Lancer 2.0 16V Turbo Evo 9 and many others. Check compatibility with your vehicle.