Sparkplug Heatrange?

[blow thru]

Hey, im currently making 299rwkw-402rwhp on an rb20 now i am using ngk r567a-8 non protruded plug i just checked my plugs an they were fouled up but i had a boost leak hense maybe why the plugs are now fouled up.What would anyone recommend 7 or 8 heatrange running 1.5bar. Have all supporting mods etc.I have searched but got no concrete results an most seem to be using BKR7ES.

Thanks for any imput.

[Wheezy]

RB20 here with 380rwhp.

Using GREDDY Iridium 8 heat range. (Manufactured by NGK but the electrode is not iridium coated, but solid iridium I am lead to believe)

Solved my spark issues (Even with new coil loom \ splitfires)

[blow thru]

I have never had any spark issues with 8s as such just wondering if i could get away with 7s? my 32 is just a cruiser with the odd stab.more inclined to a street driving heat range

[Wheezy]

I have found with 8's as long as I let it warm up to operating temps before driving or turning it off it is fine

[joeyjoejoejuniorshabadoo]

i run 420rwhp on BCPR7ES and have no problems (rb25 on 1.3bar)

[SimonR32]

yeah bcp7es are a nice plug...

gap them to 0.8-0.9 and away you go

[blow thru]

Interesting well i may give the BCPR7ES a go.thanks guys

[Wheezy]

Has anyone noticed any difference between a Resisted and NON-Resisted plug at this level of power?

[SLAPS]

Give the 7's or 8's a hard run on the dyno then pull them out to see if they are too hot or too cool.

I've in my motor copper 6's are good up until around 250rwkw then up to 300rwkw 7's past that 8's.

Leaning out the cold start enrichment (of which u can do a fair bit from default pfc values) also helps prevent the plugs fouling on short trips. Tweaking cold start enrichment etc is the difference between leaving the car with a tuner for 3days with a $600 tune vs a quick tune for $300-$400. Or fiddling yourself leaning it out every cold start until you experience driveability issues.

380rwhp I'd run 7's. BCPR7ES @ 0.8mm

I've also ran resisted and non-resisted at around 400rwhp - no difference that the dyno or I could notice. Both plugs required a gap of 0.8mm with std nissan coils.

[AD4M]

BCP6ES here with .7 gap, 2bar 405rwhp on std coils and no misfire