BlueBomber

hey everyone i'm just curious what kind of spark plugs everyone is runnin and if you saw much of a change with them.

 

Groucho

NGK TR55s and MSD 10mm wires, swapped out at 50k miles.

Can't say I've noticed any difference....just a maintenance thang.

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fergyflyer

I was talking to a guy at a speed shop about this. He said do you think GM would spend the $10 a plug that it costs for iridium plugs if there wasn't a benefit over the $3 copper plugs. The extra cost to GM for those plugs for just the 2005 GTO is $672,000. For the C6 it is $2,128,000 for plugs for just the 2005 model year. He did add that if you radically changed the engine, heads, cam etc... there would probably be a better plug. If you use nitrous there definately is better plugs.

westell

I did notice a difference on the @ss dyno. quicker lift of front. better throttle response. I put the TR55's and Taylor 10mm's

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2004 Onyx Black, M6, Mods in excess of 250 characters excluding BB Code markup

Groucho

You maybe right-- I haven't really noticed a big enough difference to say- "Woah."

And I don't want to know how one goes about calibrating a butt dyno, thenk yew veddy much.

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BlueBomber

so our goats have iridium plugs from the factory is that what your sayin ferg?

fergyflyer

Yes they are iridium.

BlueBomber

thanks for the input guys i put new long tube headers on yesterday and since it is a royal PIA to change the plugs after headers are installed i put some TR55's in. man i like the way she runs and sounds. time for a dyno.