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Discussion Starter · #1 ·
Looking to buy a set of NGK plugs, what grades are people using here for running at around 1.4-1.6 bar and 600-650bhp?

Thinking of going for 8s, not sure how these would be maybe I need to go a step colder?

My old stage 1 setup running 1 bar with grade 7 never had an issue but as I am going up in power and boost...
 

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Discussion Starter · #5 ·
A mix of both but. A tough one between the two grade 8 or 9. No buying both is not an option as they are around 120 a set :runaway:
 

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Discussion Starter · #11 ·
I chose the NGK racing plugs having had failure with Denso plugs which scored my bore and damaged the valve seat in my head causing a loss of compression, just wanted something that is durable and would not fail.
 

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I chose the NGK racing plugs having had failure with Denso plugs which scored my bore and damaged the valve seat in my head causing a loss of compression, just wanted something that is durable and would not fail.

I had exactly the same thing happen to my nissan pulsar years ago I would never use denso again
 
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