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Discussion Starter · #1 ·
Sorry if this is a noobie question, but how much difference is there between running a hotter plug than a cold one on cars with 750+ RWHP (blown or turbod) when running WOT in a roll on race or down a drag strip where you might hit most of your gears? Is there a HP difference or does the car just not run as well, or do they just foul up quicker, or what?

Which do you feel are the best plugs for cars of this power?

Manny
 

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Discussion Starter · #3 ·
So you are down on power when tooling around town normally, but when the Nitrous is kicked in, it makes more power than it would if you had a hotter plug?
 

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Manny_C said:
So you are down on power when tooling around town normally, but when the Nitrous is kicked in, it makes more power than it would if you had a hotter plug?
Yea - its a trade off. A stock plug will burn too hot with the nitrous and burn it up - so you need a colder plug.

It is usually easy to know who you need the nitrous with and who you don't.
 

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Why do you think a colder plug would lower horsepower?

Spark plug heat range is all about finding a compromise between being cold enough to avoid pre-ignition yet still being hot enough to burn off combustion deposits.
 
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