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.