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Discussion Starter #1
Want to get some new spark plug, but not sure what to order.

Everyone say you go 1 step colder for every 80 bhp, so that will make me need a grade 10 spark plug? Would that be too cold?

I know most Stage 1 GTR use Grade 8. Anyone with a 600bhp single turbo GTR can give some advice.

Cheers,
 

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I run 8's as recommended to me by RSP.
 
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Depends what you doing with your car, if your Top Speed running we would run a 8 heat range but with a non protruding tip (less chance of the tip falling off) any other work a normal protruding 8 heatrange will be okay
 

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slegros said:
8's up to about 1.3-1.4 bar should be OK, 10's are way too cold, engine would be terrible around town on 10's
Sure 10's are probably a bit cold.... we run the NGK racing 10's in the race car. I have really liked them so far.

The normal 10's would foul out, but the racing ones don't seem to do it. Of course the racing ones are about $38 US a plug.
 
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