Heat range 9 plugs

[ChrisS]

Anybody using heat range 9 irridium plugs. Having a few intermittent misfire issues which at the moment i rekon are down to the plugs been too cold. Whats other peoples experiences and have you changed back to 8's.
Im using NGK plugs, car running somewhere in the region of 380 to 400 bhp id guess, 3071r at 1.4bar.

 

[leemh]

mine was nearon standad and i had heat range 9(hks) plugs in with no problems...sold the car and it got driven back to germany with no problems what so ever

 

[antopulsar]

i run heat range 9 plugs mate. i also use 8's for a daily basis sometimes and get all sort off problems mate 9's are the cock mate

 

[davey red.r]

i use ngk bcr8es and there better than any of those tbh.
i had the hks grade 8 and they wernt as good as the current plugs.
mine is currently running about 320ish at 1.1bar.
alough ashills on here, was running over 400bhp with no issues from the bcr8es iirc.



davey

 

[stumo]

I use the NGK iridium 9's, no probs at all but then again i haven't dome too many miles on them....

 

[Major_Sarcasm]

i use ngk bcr8es and there better than any of those tbh.
i had the hks grade 8 and they wernt as good as the current plugs.
mine is currently running about 320ish at 1.1bar.
alough ashills on here, was running over 400bhp with no issues from the bcr8es iirc.

Same, running el-cheapo NGK 8s (10 quid for 4 on ebay). Over 400 ftlbs with no issues.

 

[ashills]

think of the money ive saved you lot lol