Spark plugs N54 335i - Bosch or NGK

bradsm87 · 08-12-2014, 02:55 AM

It's pretty cold in Tassie and I'm not running much boost so stuck with the Bosch (factory heat range). I'd go with NGK if running over 14psi boost in warmer climate as the NGK (N55 style) is one heat range cooler.

2007BMW335i · 06-23-2019, 04:20 PM

I went from autolite APP 5682 double platinums(for Nissan GTR). No running problems just thought it was time, they were about a year old.

I used NGK 91784 LKAR8BHX 2 steps colder than stock.(also a GTR plug)

PSPE technology for Turbo/Supercharged engines.
https://ngksparkplugs.com/en/product...um-spark-plugs

2 runs on each plug, different rpm starting points but above 4000 rpm after boost stabilizes the New plugs made a difference I didn't expect to see on Virtual dyno. Logs taken using MHD on the same custom E50 tune same day 3° cooler on NGK's but that was applied to SAE correction. Red and blue lines are the Autolite APP 5682's, orange and green are the NGK 91784's

0.020 feeler guage fits gap with no drag and a 0.022" won't fit so about 0.021"

08-12-2014, 02:55 AM	#23
bradsm87 Lieutenant Colonel 595 Rep 1,693 Posts Drives: F25 LCI xDrive30d Join Date: Jun 2013 Location: Australia iTrader: (0)	It's pretty cold in Tassie and I'm not running much boost so stuck with the Bosch (factory heat range). I'd go with NGK if running over 14psi boost in warmer climate as the NGK (N55 style) is one heat range cooler.
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06-23-2019, 04:20 PM	#24
2007BMW335i Private First Class 81 Rep 56 Posts Drives: 2007 335i Join Date: Apr 2016 Location: Lowell, AR iTrader: (0) Garage List 2007 BMW E92 335i [0.00]	RUTHENIUM HX™ Installed PSPE version. 0.021" gap I went from autolite APP 5682 double platinums(for Nissan GTR). No running problems just thought it was time, they were about a year old. I used NGK 91784 LKAR8BHX 2 steps colder than stock.(also a GTR plug) PSPE technology for Turbo/Supercharged engines. https://ngksparkplugs.com/en/product...um-spark-plugs 2 runs on each plug, different rpm starting points but above 4000 rpm after boost stabilizes the New plugs made a difference I didn't expect to see on Virtual dyno. Logs taken using MHD on the same custom E50 tune same day 3° cooler on NGK's but that was applied to SAE correction. Red and blue lines are the Autolite APP 5682's, orange and green are the NGK 91784's 0.020 feeler guage fits gap with no drag and a 0.022" won't fit so about 0.021" Attached Images __________________ 149,000+ miles, MHD, VRSF 5" FMIC, Aluminum charge pipe. E50 tune by Wedge Performance. 3" Catless DP's. Secondary Cat Delete. DCI cold side w/silicone Inlets. N20 TMAP, "Stage 2" Walbro 450 LPFP. xHP Stage 3. 1/4 mile 12.079sec @ 118.79mph. (2.03 60')Before xHP flash and rear cat delete.
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