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Spark Plug Database - Gen2 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:
NGK Copper Plugs LZTR4A-11 (5306) LZTR5A-13 (4306) BKR7E |
General Specs 14mm Thread Size, 25.4mm (1") Reach, 5/8" (16mm) Hex Size, Tapered Seat, Resistor tightening torque: 8.0 - 10.3 ft/lbf, (10 - 14 N/m, 1.1-1.4 kgf/m) anti-seize on threads recommended What's this whole "Heat Range" thing about, and why do I care? AutoliteSparkplugs.com >It's believed that the MZR is damn near ready for one step colder from the factory. >Colder plugs are an integral part of KR management Pics of screwed up spark plugs, and what they mean Spark Plug Diagnosis As a general theory, your ceramic should wear to a nice coffee with lots of cream color. Bright white ceramic means you should try a colder plug. Dark needs hotter. Beyond that, if your plugs ever end up looking like anything in these pics, well, you've got much bigger problems than this post is going to help with... Just what the heck do those numbers mean anyway? Reference Charts: NGK - NGK spark plugs symbol code Autolite - http://www.autolitesparkplugs.com/im...0numbering.jpg Denso - Untitled Document Champion - Untitled Document Just how long can I expect my fancy new plugs to last? Both Cobb and Denso have written on the subject. Denso has a generic note that indicates a lifespan of about 30K miles, but Cobb is even more conservative and notes the hell that is a DISI Motor will see the benefits dropping off after only 15K miles: Per the Cobb MS3-MS6 Service Bulletin v1.03: "...operating the car with higher than stock boost levels or with the calibrations that are on the AccessPORT, require that a spark plug gap of .026” - .028” (6.6 - 7.1mm) be used on a 1-step colder temperature plug. Denso currently offers this spark plug as part # ITV22 (please be sure to verify each plug is properly gapped before installing them). Our experience has shown that operating your turbo-charged engine at higher than stock boost levels requires that your spark plugs be replaced at around 15,000 mile intervals." Colder Heat Ranges generally accepted gap, where adjustable, .026 (range .025 to .028) ==================== >Autolite Single Platinum Spark Plug Part No. AP5263 $2.50 >Autolite Double Platinum Spark Plug Part No. APP5263 $4.00 >Autolite Xp (Xtreme Performance) Iridium Enhanced Fine Wire Spark Plug **Cross-references the Denso ITV-22** Part No. XP5263 $6.50 >NGK IX Iridium Part No. LTR71X-11 $8.00 ea. >Denso Iridium Spark Plugs Part No. ITV22 - one step colder $11.99 (streetunit price) Part No. ITV24 - two steps colder $11.99 (streetunit price) Factory Heat Range generally accepted gap, where adjustable, .032 (range .028 to .032) ==================== >Autolite Double Platinum Spark Plug Part No. APP5364 $3.99 >Champion Double Platinum Spark Plug Part No. 7437 $4.29 >Motorcraft Original Equipment Finewire Single Platinum Spark Plug Part No. SP432 $4.69 >Motorcraft Original Equipment Finewire Double Platinum Spark Plug Part No. SP478 $4.69 >Bosch Platinum+2 Spark Plug Part No. 4315 $4.99 >Bosch Platinum Ir Fusion Part No. 4515 $5.71 >Bosch Platinum+4 Spark Plug Part No. 4488 $5.99 >Pulstar Platinum Pulse Plug Part No. EF1P $9.99 >ACDelco Professional Platinum Spark Plug Part No. 41-814 $6.49 >Champion Iridium Part No. 9901 $5.74 >NGK Premium Iridium Part No. ILTR6A8G $9.94 >Autolite Xp (Xtreme Performance) Iridium Enhanced Fine Wire Spark Plug Part No. XP5364 $6.59 >Pulstar Iridium Pulse Plug Part No. EF1I $12.99 >E3 Premium Special Electrode Automotive Spark Plug **no reports of this plug working worth a crap in the MZR engine** Part No. E3.66 $5.99 |
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