Spark plugs for a `medium tune` UK car
#3
Subaru's workshop manual recommend using an NGK 6 for the turbo engine. Some would agree that this is a little too hot. Speak to Andy at BRD and get home HKS S35i Iridium's. They are about the same as a number 7, and saw me ok running 18PSI boost. They also seemed to be ok running 1.6BAR.
Dan
Dan
#4
MY01 STI RA. Engine and exhaust unmodified.
Currently running NGK "Iriway" #8. So far no fouling, misfires etc. I blew one Denso Iridium IK24 on WOT gear 4 just as the boost hit max (~4500rpm), car became a 3 cylinder boxer. Anyone contemplating using Denso's, proceed with Caution.
That was why I switched back to NGK. They're the OEM for the STI aftermarket iridium plugs (check out www.subaru-sti.co.jp, use a translator; or www.japanparts.com), and they recommend a #8 heat range for rally.
Maybe the tropical climate allows me to get away with #8 on a std engine, so those in temperate weathers may not want to go this cold.
Currently running NGK "Iriway" #8. So far no fouling, misfires etc. I blew one Denso Iridium IK24 on WOT gear 4 just as the boost hit max (~4500rpm), car became a 3 cylinder boxer. Anyone contemplating using Denso's, proceed with Caution.
That was why I switched back to NGK. They're the OEM for the STI aftermarket iridium plugs (check out www.subaru-sti.co.jp, use a translator; or www.japanparts.com), and they recommend a #8 heat range for rally.
Maybe the tropical climate allows me to get away with #8 on a std engine, so those in temperate weathers may not want to go this cold.
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