What Heat Range Should I Pick For Spark Plugs ?

[Tweaky]

Just bout to change my spark plugs on my R33 with 280rwkw , what heat range would you recommend ? They currently have NGK iriddum ( BPR6EIX ) in them which have 0.8 mm gap. Should i stick with them , as i haven't had any problems with them ? Local auto shop recommended going to ( BKR5EIX ) which i know is a hotter running plug . Will i have any problems with this plug ? I have just learnt the more power you have & boost running the colder the plug should be ! Any advice would be great

Edited January 12, 2011 by Tweaky

[Robert Knight]

Hi Tweaky,If you've had no trouble with them keep using them,except with this caution, have a look at them when you pull them out and if they are whitish or more than ashen grey they may be too hot already which won't do your valves any good,I'm running IRITOP 7 IN MY 240AWKW GTR now but it had 8's in it before,both ran great but my 8's were a bit dark so I went 7's,I definately wouldn't go hotter if I were you and keep the .8 gap with that power.Cheers GREYPEARL.

[r31slpr]

how often are you changing them? if its often maybe try a copper plug like a bpr6es. like tweaky said, don't go hotter

[Tweaky]

Changing them around once a year , which would be less then every 5000's km . Due to only being a weekend car . The 6's just had a light coating of black on them & all 6 were pretty even in colour . So i'll stick with what i already have , as i'm having no dramas .

[mad082]

go either 6's or 7's. 5's will be way too hot for 280kw. at the rate you are changing them, just get copper plugs and save yourself a lot of money.