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As above...unless you're having troubles, go as low heat range as possible...6 is good for that power.

im running bcpr6es-11's at the moment but trying to suss out if its still correct for the increase in power and boost.

Getting a bit of misfire after some spirited driving and seeing if i can fix it up with some colder sparkplugs...

NGK site says:

Ignition Timing

  • Advancing ignition timing by 10° will cause the spark plug tip temperature to increase by approximately 70° to 100°C.
  • A colder heat range spark plug may be necessary if the ignition timing has been advanced to near the knock level. Higher cylinder temperatures near the knock level will bring the spark plug firing end temperature closer to the pre-ignition range.

Forced Induction (Turbocharging, Supercharging)

  • A colder heat range spark plug may be necessary due to the increased cylinder temperature as boost pressure (manifold pressure) and subsequent cylinder pressure and temperature increase.
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