NGK # 6418 Iridium Spark Plugs BKR6EIX - 4 PCS NEW

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Designed specifically for the performance enthusiast Iridium IX offers extreme ignitability, improved throttle response and superior anti fouling. I was hoping by performing direct comparisons on all 4 grades I might be able to learn something about the way they are coping with TFSi fuelling characteristics. The spark plug can help maintain the optimum combustion chamber temperature, when a spark plug is referred to as a “cold plug” it is one that transfers heat rapidly from the firing tip into the engine cylinder head, which keeps the firing tip cooler. A “hot plug” has a much slower rate of heat transfer, which keeps the firing tip hotter. Logan Petrol Saloon 1.6 16V (LS09, LS0L, LS0M, LS0P, LS0V, LS18, LS1S, LS1V,... 1598cc 77KW 105HP K4M 690;K4M 694;K4M 696;K4M 697;K4M 698

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,Manufacturers don't seem to want us to be included in the ownership process; there seems to be a 'dark veil' surrounding the act of questioning their decisions: ...'filled for life'...'they all run hot'...'they all need premium plus fuel'...'manufacturer fluids only'...with dire consequences of warranty violation. 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.

For recommendations as to which plug to choose read this: http://www.audi-sport.net/vb/new-a3...-recommendations-s3-8p-2-0t-oem-modified.html NGK Iridium 7 (BKR7EIX) - One steps colder (In car for 6k on Revo Stage 2, changed for 2+, no issues other than electrode discolouration causing concern) Ok guys, I see the same questions asked over and over about spark plug selection and fitment, so I hope this information below helps.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? Z14XE, Z16XE, Z16LET, Z16LER, Z18XE, Z20LET, Z20LEL, Z20LER, Z20LEH, X20XEV, C20XE, C20LET, X25XE, Y26SE, X30XE, Y32SE.