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7's are really to cold for a street driven car, id be suprised if they came out "clean"

Generally there is no formula for heat ranges, rather you have to read the plug and make an educated decission about whats going to work.

For a mild street driven car 6's are the way to go. I usually run 6's if I drive it around and change to 7's when I know its going to get flogged.

NGK coppers, the BCP6ES as people have mentioned.

Alternatively a swap of plugs, from the daily driven 6's to 7's for a track day is a better solution again.

Platinums and irridiums are a big waste of money. Don't bother with them.

NGK coppers wont last more than 5000 kms, platniums are ment to last around 30,000+kms depends on what mods

NGK coppers wont last more than 5000 kms, platniums are ment to last around 30,000+kms depends on what mods

But coppers make a better spark. Platniums / iridiums etc. are ok for stock or na cars but i'd stick to coppers for anything forced induction or making decent power.

platinum plugs for stock passenger cars and nerdy drivers.

For many years I've used copper plugs for the basic reason that plugs are a tuning consumable and a tuning indicator. When you start into performance tuning even at very mild levels irridium and platinum plugs become a waste of money. Not only that but being coated in a substance that promotes a very clean surface means they are pretty useless at acting as a tuning indicator.

But coppers make a better spark. Platniums / iridiums etc. are ok for stock or na cars but i'd stick to coppers for anything forced induction or making decent power.

hey how long do your copper plugs last before you need to replace them.

or you notice loss in power.

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