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Old 08-24-2012, 01:09 AM   #1
locoycabron
 
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Which spark plug for 515ish RWHP

Which spark plug would you guys use on a 2010 camaro with 515 RWHP with a a big cam? I know the stock spark plug is rated 5 for heat range so the next step would be a 6.

Should i apply 1 colder heat range for each additional 100 RWHP or 2 colder heat ranges?

Would you go 2 steps for a:
NGK BR7EF or
NGK Iridium TR7IX

Or well just 1 step ahead to a 6 heat range numbered spark plug?
NGK BR6EF or
NGK TR6IX

thanks for you comments!
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Old 08-24-2012, 07:38 AM   #2
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Factory plug.


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Old 08-24-2012, 08:02 AM   #3
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I'd try the 1 step colder Iridiums and see how they look after a few hundred miles. Better to err on the cold side.
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Old 08-24-2012, 08:25 AM   #4
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Quote:
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Factory plug

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Old 08-24-2012, 08:53 AM   #5
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NGK TR6 stock number 4177 NGK. NGK plugs the higher the number the colder the heat range with some plugs the lower the number the colder the heat range.
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Old 08-24-2012, 09:11 AM   #6
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tr6 and see how they run, probably will load up at idle and low rpms, go with a tr5 gapped at .035.

the br plugs are for nitrous. don't waste your money on iridium. nothing performs better than copper.
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Old 08-30-2012, 10:30 PM   #7
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tr6 and see how they run, probably will load up at idle and low rpms, go with a tr5 gapped at .035.

the br plugs are for nitrous. don't waste your money on iridium. nothing performs better than copper.


tr6 running like a charm now ill keep posted if they get flammed or they survive gapped at .40
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