NGK # 6418 Iridium Spark Plugs BKR6EIX - 4 PCS NEW

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An unaltered engine will run within the optimum operating range straight from the manufacturer, but if you make modifications such as a turbo, supercharger, increase compression, timing changes, use of alternate racing fuels, or sustained use of nitrous oxide, these can alter the plug tip temperature and may necessitate a colder plug. A rule of thumb is, one heat range colder per modification or one heat range colder for every 75–100hp you increase. In identical spark plug types, the difference from one full heat range to the next is the ability to remove 70 degrees C to 100 degrees C from the combustion chamber!

Bosch platinum single electrode - OEM plug supplied from factory (In for 11k on Revo Stg1 - removed due to stutter at 5,000rpm) However, whilst I believe this may be the case for the 'old skool' turbo charging systems the TFSi system is a very different animal, and the way they system obviously mixes its fuel into the chamber means that maybe the heat issues may not be so prevolent. In both cases these plugs had been factory-fitted and run for ~10 000mls. The electrode gap variation was varied so I (later) cleaned them with a stiff plastic brush and set them 'correctly' (imo) to 0.7mm (advised by a trusted tuning firm) to keep as 'spares'. Gaps ranging from 0.5mm to 1.0mm; can't be right, surely? Question 4: is although the Iridium is seen to be the performance spark plug, the fitting of the Iridium spark plug itself will not give any power performance gain, many people report, that when they changed from Platinum to Iridium, they felt a livelier throttle response, in fact what you will have done is simply, renew old tired spark plugs with fresh new spark plugs, the ignition system now performing as it should do, thanks to the change of tired old, for new fresh, the material change in the case of Platinum to Iridium has played no difference! The other question (Q1) will be answered as you read on, Platinum and Iridium is used for it's hardness and resistance to wear, this gives longevity between service intervals, with Iridium being the harder of the two,

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BKR6EIX-11 (NGK-3764) a.k.a Iridium IX-11 - This is pregapped at .044 and should not be used in our cars. Adjusting a gap of this width is not necessary and should not be attempted.

Z14XE, Z16XE, Z16LET, Z16LER, Z18XE, Z20LET, Z20LEL, Z20LER, Z20LEH, X20XEV, C20XE, C20LET, X25XE, Y26SE, X30XE, Y32SE.

Now I've got you thinking, So what's the best spark plug for my Mini? That all depends on what you do with your Mini, and of course your budget, if your Mini is your daily driver and you rely and trust your dealer (they know best!) then you may as well stop reading now, if on the other hand your Mini is your daily driver come weekend warrior, or is just your weekend warrior, and you do your maintenance yourself then read on.

Do not make spark plug changes at the same time as another engine modification such as different injectors/timing changes different boost loadings from your chosen forced induction, as in the event of poor results, it can lead to misleading and inaccurate conclusions, an exception would be when the alternate plugs came as part of a single precalibrated upgrade kit. When making spark plug heat range changes, it is better to err on the side of too cold a plug. The worst thing that can happen from too cold a plug is a fouled spark plug, too hot a spark plug can cause severe engine damage! Some of you may well be saying, Why use it at all if what we see/read here is true? As touched upon earlier, Platinum and Iridium are used for their ability to provide longevity between service intervals and the resistance to wear, especially Iridium, that's it. 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.BKR6EIX Iridium tip, this is an alternative replacement for the BKR6EQUP with the same heat range (6)