Ford Focus ST MK3 250PS & MK4 280PS Standard Heat Range Spark Plugs
NGK Spark Plugs is one of the world’s leading automotive suppliers. Specialized in the fields of ignition and sensor technology, the company supplies customers in Original Equipment and Aftermarket across the globe. Its product portfolio comprises spark plugs, glow plugs, ignition coils, and ignition leads under the brand NGK Ignition Parts as well as MAF and MAP sensors, lambda / oxygen sensors, and exhaust gas temperature sensors under the brand NTK Vehicle Electronics. With more than 14,500 employees, the company’s automotive and technical ceramics activities generate a total annual turnover of around 3.1 billion Euros worldwide. NGK Spark Plug is represented on all continents and has 41 group companies, 29 production plants and five technical centres.
Spark plugs play a vital role in the cylinders of your engine. When plugs ignite the fuel in the combustion chamber they then help to transfer the heat from the cylinder into the head and out of the engine. This is why you see spark plugs that have a different heat operating ranges. As you increase the boost on a modified turbo engine the air entering the chamber will be hotter so you have a hotter combustion cycle which requires more heat to be removed so to stay with a healthy operating temperature. When the exhaust gas temperature is extremely and since the ECU is monitoring this the car will add fuel into the process to keep things cool enough, there’s a point when it cannot add more fuel (or enough of it) so fitting the right spark plugs for your level of tune is important. Generally around stage 2 things are getting pretty hot for spark plugs and at that level of modification it can be a good idea to fit colder spark plugs.