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Originally Posted by TS 50
Whats wrong with TR55IX plugs? I've had them in my car for 4 months with no problems so far.
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The windsor has a recommended gap of 1.2-1.3, the TR55IX has a gap of 1.5. I spoke to NGK and they confirmed this and told me that they list the TR55IX as the correct plug but they need to be regapped to 1.2-1.3 but if you do this they won't warrant them and they also don't recommend doing it because they are iridium and brittle. So they say gap them so they are right but don't gap them because they are easy to break, makes sense huh
: They then gave me the BPR part numbers, BPR5EFS-13 & BPR6EFS-13, as a substitute. I went the colder range 6 since I was having detonation issues with the TR55IX, and that did solve the problem.