Quick spark plug question

[deepseastetson]

Well so some of you know The motor is comming out of my WRX for a head gasket replacement. Quick question is Spark plugs. Should i get the Irridium ones? they make a bigger spark and i already increased the air in the engine so i would think bigger spark, more air and then upgrade injectors/fuel pump right?

[SD_GR]

Generally a non issue. Speak to whomever you are using to map the car and fit something with which (s)he can work.

For high output applications some have reverted to copper. Consider heat range too but again, only if necessary for a good map.

[deepseastetson]

Well i have stock plugs now, and i dont think i am going to go crazy high on mods so i think stock heat rating is fine but i do have some upgrades so i was wondering if i should upgrade to a bosch platinum 4, or Denso Irridium, or NGK iridium or something that supposed to create more spark? or is stock plugs fine. I am going to upgrade the injectors to like 650 and upgrade the fuel pump.

[SD_GR]

Stock are correct. Shop based on price not marketing.

[deepseastetson]

Cool got it. I just didn't know if stock plugs would hold up after some basic modding. I was getting some hesitation/skipping under acceleration and didnt know if it was because the plugs were shot or could create enough spark for the amount of air i was pushing. the engine will be coming out and i am getting ideas of other maintenance i should do while its out.

[SD_GR]

Full front cover with water pump, consider oil pump, check oil pickup tube, discuss condition of valves. Add it all up and compare total cost to replacing rather than rebuilding.

[SD_GR]

By the way, an authentic set of gaskets alone is expen$ive so I'd do lots of math before lots of $pending. I like money a lot more than I like cars.

[deepseastetson]

well seeing how i dont have a lift or a cherry picker and i work about 50 hours a week. I am having the dealer do this. they are replacing the head gaskets and the power steering rack and pinion boots for 1900 bucks. plus i get a 10% military discount on all that. He showed me the problem areas so i know i'm not getting ripped off. im sure a total engine replacement would cost more than that.

[MainFrame]

I wouldn't say the iridiums make a bigger spark.. they just tend to last longer. My tuner, along with many others highly prefer copper plugs over iridium when tuning high boost and e85 because the spark is better on the copper plugs and less likely to blow out than with iridium or platinum plugs.

For your car stock plugs will be fine.. iridium is fine if you're wanting to wait a little longer between changing them (I change my plugs every 10k miles).


NGK are good.. I do not recommend using Champion plugs in a turbo charged vehicle, too many people have had issues.

[zax]

For high output applications some have reverted to copper. Consider heat range too but again, only if necessary for a good map.

This. Copper plugs will spark much better, but for a shorter lifespan. The Iridiums are known for sparking at a much more consistent output for longer.