Therefore, the higher the level of tuning, the greater the need to use a type with recessed electrodes. On the other hand, this type of plug is more susceptible to exposure to hot combustion gases and the longer ground electrode makes it less heat-resistant and durable. Generally, a plug that protrudes into the combustion chamber has superior ignition performance, resulting in improved engine performance.Select the heat range of the spark plugs according to the tuning level, based on the heat range of the standard spark plugs or Iridium Power plugs. Iridium Racing plugs are intended for racing and also for tuning up.Select the heat range at your own discretion and responsibility when using the spark plugs in a tuning or modified vehicle.( * ) NOS: a device that increases engine power by injecting nitrous oxide with gasoline into the air intake If the spark plug is not selected correctly, the vehicle may be damaged by carbon fouling, oil fouling or pre-ignition (the natural phenomenon of spontaneous combustion occurring faster than spark plug ignition), etc. If the engine is modified, or if the tuning or modified vehicle uses an aftermarket muffler, ignition coil, plug cord, turbo installation, electronic ignition system, NOS ( * ), etc., the heat range of the spark plug must be increased according to the level of tuning.If the extended type spark plugs (J, QJ, KJ, PKJ, SKJ, VKJ, TJ, etc.) are installed to any other designated engine, it will interfere with valves and pistons and may damage the engine and plug.Noise associated by spark discharge may cause engine trouble. Do not use a non-register type spark plug for a model specified a register type spark plug (spark plug with resistance).However, if you often drive at low speeds or short distances and the carbon fouling recurs, you might able to avoid carbon fouling recurs by selecting a low heat range spark plug. Spark Plug Selection Know-How Normal Vehicle Select appropriate spark plugs with the correct dimensions and heat range by checking vehicle manual, maintenance manual and this catalogue’s or websites’ application table. Please note that this catalogue does not include models that will be release after that. The information and data may change after updating or publishing. Data given in this catalogue are those as of October 2022.The images of spark plugs indicated in the catalogue and website are conceptual diagrams, and sometimes differ from the actual products.The appearance and specifications of the product are subject to change without prior notice.Please contact your regional DENSO representative for further assistance. Those cannot be sold directly from DENSO. Some spark plugs on this catalogue and website are manufacturer’s genuine parts and reference only. Consumption tax and installation fees are not included in the price of the product.Please note that this catalogue and website does not include models that will be release after last updating or publishing. The contents of the catalogue and website are updated on a regular basis, however, the information and data may change after updating or publishing.If not listed on the table, please check with your regional DENSO Representative. Select a suitable type of spark plug from the vehicle application table.The spark plug specifications (construction, material, etc.) differ by manufacturers.Always check the applications section for DENSO recommended spark plugs. Table does not guarantee the performance of spark plugs when installed in the vehicles even plug was specified in cross references. Precautions for cross reference and product tables listing other manufacturer’s spark plugs:.
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