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My understanding of heat ranges with cars is that colder running plugs cope with higher temps and more grief then hotter plugs. The down side is that if you go too cold with the plug they can foul easily at idle, on the HWY, etc... Colder plugs are better for reving, hot engines???

(I am so going to get crucified for that).

I know that when I put my cooper s on the track, I change the plugs down to a colder set and that gives me a more consistent and reliable spark then normal street plugs... But if I try and drive around the street on them they foul in 10 mins...

Not sure what range would be too far for you Hamish... Sorry

  neo32 said:
ive tryed iridiums and they foul up when the car breaks lose

using copers and they fowl up when i give it stick when its cold

just looking to see what people are doing

It runs RICH when the engine is cold. You shouldn't be giving it stick when the engine is cold.

Some people don't deserve a Skyline.

  skylinekid said:
ive been suggested to run ngk r5671A-8 like 6bucks a plug and they reckon they do the job

The chosen plug of champions. ;)

I have used these plugs in my RB20 and now have a set in my RB30/26

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