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 Old 05-19-2008, 04:14 PM   #1
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Default Spark Plug Database - Colder Than Stock ( Stage 1&2 )

This is a compiled database for spark plugs who's heat range is 1 and 2 stages colder than stock. Please add your plugs and we will update this thread.

Mazdaspeed Forums Spark Plug Index Database

Gap size - 0.26 - 0.32 | Preferred gap is between 0.26 to 0.28

Type and Specs on DISI 2.3l Spark Plugs: 14mm; 5/8 hex; 25mm reach; projected tip; resistor plug

Heat Range Conversion Chart
Code:
 
HKS 25 30 35 40 45 50 52.5 55
DENSO 16 20 22 24 27 31 32 34
NGK 5 6 7 8 9 10 10.5 11 
Spark Plug Manf & Part Numbers
  • Denso Iridium
  • itv-20 - Stock heat range
  • itv-22 - 1 stage colder heat range
  • itv-24 - 2 stage colder heat range
  • itv-27 - 3.5 stage colder heat range
  • HKS
  • 50003-M35LF *Mazda MZR Engine* ; Mazda 3, Mazda 6, MX-5 '06 7 $22.97ea. - 1 Stage Colder Heat Range
  • 50003-M40LF *Mazda MZR Engine* ; Mazda 3, Mazda 6, MX-5 '06 8 $22.97ea. - 2 Stage Colder Heat Range
  • NGK IX Iridium
  • NGK LTR7IX-11 (6510) - 1 Stage Colder Heat Range
  • NGK ILTR6A-8G (3787) - Stock Heat Range


  • Torque Master Spark Plugs
  • SVTP8BR Stock Heat Range
  • SVTP7YR 1 Stage Colder Heat Range
  • Autolite Iridium
  • Autolite Iridiums XP5364 - Stock Heatrange
  • Autolite Iridiums XP5263 - 1 Step Colder

NGK Copper Plugs

LZTR4A-11 (5306)
LZTR5A-13 (4306)
BKR7E
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