WARNING: This product can expose you to chemicals that are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov.The APR Iridium Pro Spark Plugs (Z1004081) are a critical upgrade for high-output and tuned engines operating under extreme conditions. Designed for vehicles with high boost, increased cylinder pressures, and elevated combustion temperatures, these Heat Range 10 plugs provide superior resistance to pre-ignition and spark blowout. By utilizing Iridium—one of the strongest materials available—these plugs offer a 152% higher melting point than silver and require lower voltage to produce a consistent, powerful spark.
Specifically engineered for performance, these plugs feature a non-projected insulator design and a copper core for rapid heat dissipation. This construction protects the electrode from melting or cracking even when using hard-to-ignite fuels like ethanol (E85). Whether you are running an APR Stage 1 tune or a full Stage 3 turbocharger system, these plugs ensure engine safety and performance by operating significantly cooler than the factory equivalents.
Key Features:
- Heat Range 10: Operates cooler than stock to prevent pre-ignition; 2 steps colder for 4.0T EA825 and 1 step colder for 2.9T/3.0T EA839 engines.
- Superior Durability: Iridium electrode provides 38% higher melting point than platinum and 125% higher than copper.
- High-Performance Design: Non-projected insulator optimized for high cylinder pressures and tuned applications.
- Efficient Spark: Requires lower supplied voltage to generate a strong, consistent arc, reducing strain on ignition coils.
- Ethanol Optimized: Precision electrode design ensures reliable ignition for high-octane and ethanol-blended fuels.
- Thermal Management: Copper core technology facilitates rapid heat transfer away from the tip to prevent thermal failure.
- APR Synergy: Designed to pair perfectly with APR High-Output Ignition Coils for maximum ignition system reliability.
Technical Specifications:
| Specification | Measurement |
|---|---|
| Thread Diameter | 12 mm |
| Thread Reach | 26.5 mm |
| Hexagon Size | 14 mm |
| Supplied Gap | 0.55 mm (+- 0.05 mm) |
| Installation Torque | 17 Nm |
| Seat Type | Gasket |
Heat Range Cross-Reference:
| Brand | Equivalent Heat Range |
|---|---|
| Bosch | 2 |
| NGK | 10 |
| Denso | 31 |
| Brisk | 8 |
CRITICAL WARNING: Verify thread length and reach before installation. Installing a plug with the incorrect reach can cause catastrophic internal engine damage. Ensure your specific engine application is compatible with a 26.5mm reach plug.
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