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evolele evolele is offline
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Default time to replace spark plug - 06-19-2014, 10:03 PM

Hi! How many miles you guys change your spark plug? Do I need to replace my stock spark plug on 25K miles? And which model you prefer, nkg 5992? Moreover, does JB4 map2 reduce spark plug life span?Thanks a lot!


2012 F10 535i M Sport| JB4 stage 2 | BMS intake | Down pipe | Eisenmann exhaust | Brembo GT Kit | KW V3 | 20" Forged Wheels |
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Miller335 Miller335 is offline
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Default 06-19-2014, 10:20 PM

To put it simply the more more boost you run , the faster your plugs wear out.

NGK 5992's are good when running more boost/timing, but some cars have various cold start issues with those plugs (Mainly with E85 high levels of e85).
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evolele evolele is offline
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Default 06-19-2014, 10:57 PM

Thank you! Do you have a suggestion for plugs? I may replace them around 3K miles.


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Luke0818 Luke0818 is offline
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Default 06-19-2014, 11:14 PM

There is no set number of miles to replace them. It all depends on how you drive and how much boost you are running. Replace them every 3k miles is excessive. The stock plugs lasted about 10k with full bolt on+meth. nkg 5992 are great plugs. Just make sure you gap them right then you are set to go.


2008 e93 MODS: BMS JB4 G5 ISO, bms trunk, RB PVC, Lukeperformance flash, mount meth kit, OCC, ******* ********, VRSF 7" FMIC, charge pipe, DCI, Alpina flash,
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IBND335i IBND335i is offline
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Default 06-20-2014, 02:08 AM

Ngk 5992 gapped at .022 ( used a wire gauge and took my time)

Dci, bms occ, and 50/50 mix e85/93oct all day every day. On map 5. No cold start issues at all.

I still need to get to a dyno and see what she is putting down. She pulls like a monster! And she has over 101'000 miles on her.
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montgom626 montgom626 is offline
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Default 06-20-2014, 02:23 PM

Quote:
Originally Posted by IBND335i

Dci, bms occ, and 50/50 mix e85/93oct all day every day. On map 5. No cold start issues at all.
Cold start is dependent on where you live.

0 degrees F is cold. 70 degrees is not cold.
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IBND335i IBND335i is offline
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Default 06-21-2014, 01:15 AM

Regardless where you live, a cold start is a cold start. But yes, in some areas of country/world temperatures very.
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Steve 335i Steve 335i is offline
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Default 06-23-2014, 09:04 AM

I changed mine right before 30k miles. One of my coils broke in half when removing it, which added about an hour of headache I didn't expect. Once the plugs were changed and the new coil was installed, the car felt much better. It also eliminated some issues I was having at high RPMs where I'd sometimes get a SES light.


2009 E90 335i
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