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Sparkplug Heatrange?

blow thru

By blow thru,
in Engines & Forced Induction

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blow thru Contributor

blow thru

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Posted

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.

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SLAPS Rising Star

SLAPS

Posted
Posted

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.

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