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I remember reading some where that for approx every 75hp increase you should go one rating cooler for the plugs.

The std RB20DET plugs have a heat code of 5.

I am running 1 bar of boost fmic exhaust ebc etc.. and are using heat code of 6.

Whatsisname is making almost 240rwkw and has just changed to heat code of 7.

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I'm actually running '8' at the moment (I changed them for a track day, and found one of my '6' seemed to be damaged around the base of the ceramic).

Now for the question - will running too cold in the plug cause the engine to run too hot?

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NGK Idirdums for the RB20DET part code is bcpr6eix or -11

without the -11 its pregapped to 0.8m

I just put some of them on & man did the car feel like a new car.

When you purchase them make sure u dont buy it no more then $18.50 since rrp are $18.50 as advertised on zoom & other car mags.

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Originally posted by blind_elk

I'm actually running '8' at the moment (I changed them for a track day, and found one of my '6' seemed to be damaged around the base of the ceramic).

Now for the question - will running too cold in the plug cause the engine to run too hot?

Spoke to Ben @ NGK, he advised that the plug should not affect the engine temp. So it seems I need to talk to the radiator man.

BTW, I'm normally running PFR6B-11. NGK make a PFR6B, gapped to 0.7 - 0.8, and a PFR7B, gapped to 0.8(?).

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I use NGK Coppers 6 heat..

Hrmm Not the best ok if you don't want to stuff the good plats due to running rich.

I get a slight rough idle from them.. Slap in the Plats and a perfect idle.

They are also starting to get hard to start first thing in the morning. New plugs.. I guess. they have been in there for a while now.

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