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 Old 09-10-2018, 07:56 PM   #1
 
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Default One step colder plugs

I'm currently in the process of starting my build after finally buying all of my aftermarket parts, my goal is to achieve the most power possible on the Ko4 turbo, but I'm unsure if I need to buy a one step closer plug or not and if I do which brand is highly recommended NGK or Denso, and lastly can some provided a part number so I know exactly what to buy if I need to buy a set.
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 Old 09-11-2018, 04:53 AM   #2
 
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NGK 6510 is the one step colder plugs
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 Old 09-11-2018, 06:49 AM   #3
 
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I use Denso ITV22 for 1 step colder. But I've heard NGK is the way to go.
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 Old 09-11-2018, 10:39 AM   #4
 
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I'm on NGK 6510 gapped to .028. Running smooth as hell. Got them from RockAuto for like $5 a piece.
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 Old 09-11-2018, 01:41 PM   #5
 
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NGK 6510. They come with a huge gap and must be closed up to .026-.028".

I doubt they are needed even at "full bolted" K04 power levels, but I run them because of the 3" catless dp/rp I am running. I might even get a couple horsepower more at stock heat range, but they to give me little insurance against knock, since my tune has about 18 degrees of timing advance and I am not seeing any knock retard correction (pulling timing) on my logs.

Generally you want the hottest plugs that don't cause timing to be pulled on your tune, but the coldest plugs that don't foul, especially in daily driving.

For our car with maxed out K04 and mods on pump gas (about 300-310 whp) you are right on the line for heat range between stock and one step colder.
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