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Showing results for tags 'spark pugs'.
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Sparking Plugs For Tastefully Modified VQ25DET During a regular service recently, the workshop fitted new plugs - NGK PLFR6A-11 Platinums - to my NM35. And now the engine misses on boost at anything over 5,200 rpm. The mechanic threw away the original plugs so I can't check their heat range. But I suspect the newly fitted 6 heat range plugs are too hot. If you had an M35 with a set of tasteful mods such as: Hypergear SS2PU turbo, fat intake, HDi intercooler, uprated actuator, Scotty dump & front pipes, Fujitsubo exhaust, HDi EBC, Walbro fuel pump and big injectors, & GReddy Ultimate ECU, etc., making 267 of Jez's kW atw, would you run a 7 heat range plug like the NGK LFR7AIX IX Iridiums, or would you jump to an 8 heat range? Thank you.