NGK SILZKBR8D8S Laser Iridium Spark Plug (97506 Laser Iridium), 4 Pack

Product Information

Gapping spark plugs is another common topic for good reason. It’s important to have a good spark plug gap for many reasons. Too large a gap can cause misfire issues while too small a gap can reduce air-fuel burn efficiency. So, what is the right gap for N54 spark plugs? Let’s jump in and discuss the importance of spark plug gaps and recommendations for the 135i, 335i, and 535i.

I am running full intake/exhaust, including FMIC, and diverter valves and am catless. I am running a BMS WMI kit with dual nozzle BC 10 Chargepipe injection. Below we’ll list a few of the best spark plugs for the BMW N54 engine. Many of these are highly proven spark plugs. However, there are other good options that people have success with. As such, this isn’t an exhaustive list of all plugs for the N54 engine. These are simply products we recommend based on personal experience running these on our 2007 335i, 2008 135i, and 2008 535i. Can you speak on the impacts of running WMI and how that relates to the spark plug setup? Does WMI sufficiently cool the engine enough to make up for a full 1 step colder? What about gap sizing?FFS you seriously need to do maybe 10 minutes of research before speaking on a subject. You continue to prove over and over again your "20 years" of experience is about as useful as zero years of experience.

While colder options may exist the 1-step and 2-step colder spark plugs are the most common choice on the N54. Among the two most popular are the NGK 97968 1-step colder and NGK 97506 2-step colder. These are generally good options even for 600-700+whp builds, which is why we don’t fully agree with the 75-100 horsepower rule. NGK is the brand leader in the UK spark plug market and are the world's biggest supplier to many major car manufacturers. Each and every one of their products are designed to meet the most rigorous standards and are the professionals' choice because of their quality and technical excellence. Their plugs can be found in use by teams in F1, WRC and MotoGP. Put simply, NGK genuine spark plugs are the workhorse at the heart of smooth-running engines around the world.None of this information applies to the OEM Bosch 3-prong spark plugs. These should not be gapped. Once you reach the need to gap spark plugs you should be running 1-step or 2-step colder single prong plugs, anyways. These include the N55 OEM Bosch plugs and NGK 1 & 2-Step colder. Why Gap Spark Plugs? Discussing spark plugs for the BMW N54 engine can be a lengthy topic. While spark plugs are a pretty simple part they’re extremely important, and there’s a lot that goes into the right setup. How often should you change spark plugs? What are colder plugs and when are they needed? What are the best spark plugs and gaps? None of these question have perfect answers, but there are some general guidelines. In this guide, we discuss some of the best N54 spark plugs, 1-step & 2-step colder, plug gapping, replacement intervals, and more. Pin Spark Plug Heat Ranges The bottom of all the spark plugs all have some oil residue and carbon by the crush washer ring. Varying amounts up the threads. It took a wire brush to clean them up, including the crush washer face. There should be NO carbon or oil on the crush washer or the head seating area, yet I have it on multi-install 95770s all torque to spec. I would love someone to debate this as well. Plug gap is relative to your ignition system. A tune is not going to be relevant to plug gap. If you're running iridium plugs DO NOT gap them, you'll break the electrode. If squashing your plug gap (below factory recommendations) improves your drivability then you have a failure in your ignition system and may want to look at new coils.