Turbo upgraded, xdi-35 installing now... do i need new spark plugs?

my335i403 · 12-05-2019, 10:18 PM

If so whats recommended

DreamerJoe · 12-06-2019, 01:31 AM

there are soooo many threads on this. but to keep it simple some people run m3/m4 oem pre-gapped plugs, I beleive they are a step colder and rated for the higher power/boost the car is putting down. I haven't done a ton of research on this but I have seen A LOT of threads, you can also ask your tuner what they recommend.

p.s. whatever you decide to buy, purchase from fcpeuro. lifetime gaurantee/exchange and plug swaps on tuned cars are recommemded more frequently.

harkes · 12-06-2019, 03:20 AM

No. Dont fix what isn't broken.

Jeff@TopGearSolutions · 12-06-2019, 02:46 PM

Actually, depending on mileage, you may be due. The factory plugs can last 35-50K miles usually no problem but on a tuned vehicle especially with higher boost and potentially higher EGT you'll probably want to replace around every 15-20K miles.

12-05-2019, 10:18 PM	#1
my335i403 Private First Class 37 Rep 128 Posts Drives: 2014 335i Join Date: Nov 2018 Location: Rhode Island iTrader: (0)	Turbo upgraded, xdi-35 installing now... do i need new spark plugs? If so whats recommended
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12-06-2019, 01:31 AM	#2
DreamerJoe Captain 241 Rep 762 Posts Drives: 2017 340i M.G. w red interior Join Date: Dec 2018 Location: SoCal iTrader: (0)	there are soooo many threads on this. but to keep it simple some people run m3/m4 oem pre-gapped plugs, I beleive they are a step colder and rated for the higher power/boost the car is putting down. I haven't done a ton of research on this but I have seen A LOT of threads, you can also ask your tuner what they recommend. p.s. whatever you decide to buy, purchase from fcpeuro. lifetime gaurantee/exchange and plug swaps on tuned cars are recommemded more frequently. __________________ MG F30 M-Sport 6mt FBO w/ MHD stage 2 plus (PWG), ST XA Coilovers, 19" VMR V804.
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12-06-2019, 03:20 AM	#3
harkes Colonel 1077 Rep 2,357 Posts Drives: M135i, E39 M5, NSX and AE86 Join Date: Apr 2014 Location: Xiamen, China iTrader: (0)	No. Dont fix what isn't broken. __________________ M135i 8AT PWG, MHD, Pure Stage2, WMI via Torqbyte CM5-LT, Custom tuned by PureBoost (A Dane in China)
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12-06-2019, 02:46 PM	#4
Jeff@TopGearSolutions 3441 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	Actually, depending on mileage, you may be due. The factory plugs can last 35-50K miles usually no problem but on a tuned vehicle especially with higher boost and potentially higher EGT you'll probably want to replace around every 15-20K miles.
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