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HKS Plugs - Part 2
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02-17-2010, 11:13 PM | #1 |
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HKS Plugs - Part 2 (Updated 2/20/10)
UPDATE (4/2/10): I tried the HKS plugs but they resulted in cold start misfires (and I live in Southern California). The car would start, but would misfire. It took 3 to 4 starts before the misfires cleared up. After that, the car ran great and didn't recur until after the car was shut off for several hours (over 4 hours). I switched back to new stock plugs and the misfires went away. It appears, at least on my car, that 2 steps colder plugs are too cold.
----------------------------------------------------------- UPDATE (2/20/10): Added ceramic insulator diameter comparison to Stock (item 1a) -- they are the same diameter. I just got a set of XL heat range 8 plugs (two step colder than stock) and I am going to try them out after modifying a 16mm or 5/8in socket. ----------------------------------------------------------- I contacted HKS USA about their Iridium spark plugs and here is what they had to say: (1) According to HKS Japan, the "XL" series (50003-M40XL, heat range 8 & 50003-M45XL, heat range 9) are compatible with the 07+ 335i & 135i (N54 engine). HKS Japan's website lists the "XL" for the 335: http://www.hks-power.co.jp/products/...st/pdf/bmw.pdf "XL" requires a 16mm socket (the ceramic insulator diameter is 10.4mm) => It looks like a custom spark plug wrench needs to be fabricated to use the "XL" Plugs... (1a) HKS XL vs. STOCK (Note: the ceramic insulator diameters are the same): (2) Below is a link to someone’s blog (in Japanese) showing an "XL" spark plug being installed on a 335i (too bad I can't read Japanese!). http://cayman01.exblog.jp/tags/HKS%E...R+FIRE+RACING/ (3) The "XL" spark plugs are also used for the EVO X & Genesis Coupe 3.8L V6. http://www.hksusa.com/products/?id=3115 (4) The "HL" series (50003-M40HL, heat range 8 & 50003-M45HL, heat range 9) can be physically installed, but it may leak due to the ceramic insulator diameter being smaller than the stock & "XL" insulator. Please see the attached picture comparing the "HL" and "XL" insulator size. Because of this, it is not recommended to use "HL" series plugs on a N54 engine. "HL" requires a 14mm socket (the ceramic insulator diameter is 9mm) Let me make myself clear, the GTR plugs are "HL Series" and are NOT recommended for the N54. However, the "XL Series" ARE compatible. (5) You can purchase them from any authorized HKS dealer or directly from the HKS USA website. http://www.hksusa.com/products/?id=3115 ---------------------------------------------------- The latest thread on the HKS Plugs is here: http://www.e90post.com/forums/showthread.php?t=350416 Here are some more: http://www.e90post.com/forums/showthread.php?t=272511 http://www.e90post.com/forums/showthread.php?t=332543 ---------------------------------------------------- No, I haven't tried these on my car... yet. ---------------------------------------------------- Stock Spark Plug Data Courtesy of Former Boosted IS: ZGR6STE2 Bosch Super Plus Spark Plug 12mm Thread Size, 26.5mm (1.04") Reach, 9/16" (14.3mm) Bi-Hex Size, Gasket Seat, Interference Suppression Resistor, Surface Gap Plug, 3 Binary Ground Electrodes, Nickel-Yttrium Center Electrode, Solid Terminal Nut, 0.027" (0.7mm) Gap, Heat Range 6 Last edited by usc335; 04-02-2010 at 07:40 PM.. |
02-17-2010, 11:39 PM | #2 |
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here is a translation of the page in Japanese, used google translation so its not perfect.
http://translate.google.com.kw/trans...ial%26hs%3DTdz
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2007 BMW E92 335i (SOLD): BMS JB4 / Quaife LSD / Riss Racing DPs / Helix Intercooler / BMS Intake / STETT Charge Pipe / Forge DVs |
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02-18-2010, 12:37 AM | #3 |
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great info ! thanks!
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07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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02-18-2010, 01:05 AM | #4 |
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Nice find, thanks!
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Wanna know my mods for my 335i? It's here! http://www.e90post.com/forums/showth...ght=blue+water
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02-18-2010, 02:13 AM | #6 |
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so what's the stock spark plug heat range? is 9 better than 8?
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SGE92TT......................... 12.331 Sec @ 117.89 Mph............................POWERED BY
l BMS DCI l HELIX IC l FORGE DVs l RR OCC & CP & SCOOPS l AR 3" DPs l AE QUADs l BLISTEIN PSS10 l P3 VENT GUAGE l VISHNU PROCEDE V5 AUTOTUNE l Lots of Window Stickers |
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02-18-2010, 05:34 AM | #7 |
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Can we VERIFY what heat range our stock plugs are? Second, can we verify that these are 14mm so we can use the stock thin wall socket to install them.
Last edited by Former_Boosted_IS; 02-18-2010 at 05:44 AM.. |
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02-18-2010, 05:46 AM | #8 |
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Just want to add a slightly OT question, when is the best time to consider a spark plug upgrade? Currently almost hitting 10,000 km on my car
Cheers!
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Wanna know my mods for my 335i? It's here! http://www.e90post.com/forums/showth...ght=blue+water
Lamborghini's Mica Orange E93 M3 Akrapovic Exhaust //Challenge Rear CF diffuser//ESS VT-575 Supercharger |
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02-18-2010, 06:05 AM | #9 | |
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Quote:
found this with specs: http://www.hks-power.co.jp/db/produc...LN=EN&N_ID=326
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07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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02-18-2010, 06:13 AM | #10 |
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I did verify the heat range on our plugs 6.
ZGR6STE2 Bosch Super Plus Spark Plug 12mm Thread Size, 26.5mm (1.04") Reach, 9/16" (14.3mm) Bi-Hex Size, Gasket Seat, Interference Suppression Resistor, Surface Gap Plug, 3 Binary Ground Electrodes, Nickel-Yttrium Center Electrode, Solid Terminal Nut, .027" (0.7mm) Gap, Heat Range 6 |
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02-18-2010, 06:15 AM | #11 | |
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Quote:
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02-18-2010, 06:21 AM | #13 |
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yeah apparently. Will see. I think i will give the GTR a go anyway. I got leakage on the stock ones as well so i guess it wont harm.
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07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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02-18-2010, 06:42 AM | #14 |
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for the insulator is it meant the white part with 3 black stripes? if yes i can say that both Stock and HL / GTR ones have the exact same size of that.
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07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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02-18-2010, 04:16 PM | #15 |
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so the one with heat range 8 is two step colder and one with heat range 9 is three step colder? that seems quite a difference to me...
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SGE92TT......................... 12.331 Sec @ 117.89 Mph............................POWERED BY
l BMS DCI l HELIX IC l FORGE DVs l RR OCC & CP & SCOOPS l AR 3" DPs l AE QUADs l BLISTEIN PSS10 l P3 VENT GUAGE l VISHNU PROCEDE V5 AUTOTUNE l Lots of Window Stickers |
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02-18-2010, 06:20 PM | #16 |
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I just added the following to the first post:
Wrench Sizes: "XL" requires a 16mm socket (the ceramic insulator diameter is 10.5mm) "HL" requires a 14mm socket (the ceramic insulator diameter is 9mm) => It looks like a custom spark plug wrench needs to be fabricated to use the "XL" Plugs... and HKS Japan's website lists the "XL"for the 335: http://www.hks-power.co.jp/products/...st/pdf/bmw.pdf |
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02-18-2010, 09:08 PM | #18 |
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so if i were to put XL series on my car, since its heat range is 9 will there be any significant risk factor at all? it's not one step, not two, it's 3 step colder than stock range of 6...
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SGE92TT......................... 12.331 Sec @ 117.89 Mph............................POWERED BY
l BMS DCI l HELIX IC l FORGE DVs l RR OCC & CP & SCOOPS l AR 3" DPs l AE QUADs l BLISTEIN PSS10 l P3 VENT GUAGE l VISHNU PROCEDE V5 AUTOTUNE l Lots of Window Stickers |
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02-19-2010, 12:22 AM | #19 |
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Best is to use the one with heat range 8 , not 9 . 2 step colder is enough .
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07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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02-19-2010, 01:49 PM | #20 | |
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50003-M40HL NISSAN Skyline GT-R 2009 ; R35 8 It is the 6th one from the bottom. One member already has these installed and he says it works fine. If I can find a wrench I will order these and get them installed. There will be no modifying the hex on these just get a 14mm wrench. /B] Last edited by Htown09; 02-19-2010 at 02:03 PM.. |
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02-19-2010, 01:51 PM | #21 | |
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Is anyone else having trouble ordering from the website? I get to checkout and the bottom part has an error. |
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02-19-2010, 01:52 PM | #22 | |
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edit: the guy that is running them successfully in his N54 is running the XL plugs but he had to grind the hex housing from 16mm to 14mm in order to get them to fit. HOWEVER, the HL plugs are already 14mm. So the only question is if the ceramic coating is too thin. We need a pic of stock plug and HL plug next to each other... Last edited by Htown09; 02-19-2010 at 02:10 PM.. |
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