Best SR20DET spark plugs...

[ZenkiS14]

So my plugs are getting shot (been in for a few years), and im throwing in a new turbo (looking for 325whp), so im going to a step colder....

What is the step colder plug range?

What is the best, most reliable plug out there?

NGK Iridiums?

Thanks in advance.-Kyle

[IanS]

A step colder than what, are you running stock heat range? Factory heat range is 6, for stock boost that is fine. I run 12 PSI, and I use a heat range 7 iridium plug, which is one step colder. For the amount of power you are planning to make, I would suggest either a 7, or 8 heat range depending on your driving habits.

[wzntha]

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[Project240]

NGK BKR7E. Period.

When a plug is "colder," it means it helps reduce heat in the combustion chamber. Which is good if you're running higher boost.

Copper plugs will give you a better spark than iridium plugs, and they're cheaper. You just have to change them more often (like, more often than "a few years" =P ). Iridium plugs won't spark quite as well but they will last longer. Platinum plugs don't spark quite as well as iridium and, yep, you guessed it, last a *really* long time.

[tunermt]

NGK BKR7E. Period.

When a plug is "colder," it means it helps reduce heat in the combustion chamber. Which is good if you're running higher boost.

Copper plugs will give you a better spark than iridium plugs, and they're cheaper. You just have to change them more often (like, more often than "a few years" =P ). Iridium plugs won't spark quite as well but they will last longer. Platinum plugs don't spark quite as well as iridium and, yep, you guessed it, last a *really* long time.

To help clarify on spark plugs, i see a lot a confusion around this topic and then have to deal with it before tuning an engine so i'll try to share some helpful info here.
Colder heat range plugs use more insulation around the center electrode, this lowers the chance of overheating the plug under high loads which can make a spark plug act like a glow plug (not good as that will cause detonation).
Here is an article/guide for the SR20det spark plugs ignition coils and anyone dealing with spark blow out.
Iridium core plugs VS Copper core plugs: Iridium plugs will put out a stronger spark for MUCH longer. Both Iridium and copper core plugs work great but the copper core plugs will need serviced 3-4 times as often as Iridium.
OEM heat range:
Iridium core BKR6eix spark plugs
Copper core BKR6e spark plugs

1 step colder (common for modified SR20det 350-450hp range)
Iridium core BKR7eix
Copper core BKR7e


I personally run BKR7eix in my SR20det (16G turbo, 19psi on E85) The iridium core plugs work great and last 3-4 times as long as the copper core plugs which i will also use in a pinch. (i've also ran BKR6E, BKR7E BKR8E and BKR9eix) but prefer the iridium core BKR7eix as the copper cores just don't last long before they suffer from spark blowout and this setup doesn't require a very cold plug. Nothing worse than not being able to run full boost because you're blowing out spark. (those who've exerienced spark blow out will know what i'm talking about!!!)