01-11-2019, 12:46 PM | #1 |
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Colder spark plugs needed?
Does anyone here running atleast JB4 (I have JB4 Map 3/5, Intake, Downpipe) have any idea if colder spark plugs are needed? I sometimes have some hesistation under WOT. If so, what are you guys running?
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01-11-2019, 12:58 PM | #2 |
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You can run the 2-step colder N54 NGK plugs (since ours are already 1-step colder than N54, it's really just a 1-step colder upgrade).
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01-11-2019, 01:03 PM | #3 |
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01-11-2019, 02:32 PM | #4 |
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I've also been wondering the same thing
Is there any harm to running colder plugs with a stock engine? (I'm about to change the plugs (just maint), but plan to be not stock in the next few months, so would like to just get the right plugs once if I can, and not twice). Also I can't for the life of me find the GAP specs .. it seems they come OEM pre-gapped and don't worry about it, but I'd surely like to check first. |
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01-11-2019, 02:50 PM | #5 |
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I also have JB4 Map 3, intake, catless DP and after weighing all my options, went with the OEM 12120040551. Around 26-27K miles I started getting some very slight hesitation and backfire when I would mat it. Changed the plugs at 28K and all is well.
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01-11-2019, 02:50 PM | #6 | |
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Unless you're pushing 100+hp over stock, I probably wouldn't bother. Again, ours are already 1-step colder than N54.
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01-11-2019, 06:44 PM | #7 |
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Depends on the map, i would use it when tuned with a stage 2 map
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01-12-2019, 05:12 PM | #9 |
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01-12-2019, 05:17 PM | #10 |
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Yes, it seems very weather dependant. Lately it's been -7C here, and she'll pull like a raped ape all the time. I have AWD and it'll break the tires loose.
When it's 20-25C outside, you can really tell when you drive with light throttle or a lot of stop/go driving. I'd suspect a CAI would address this though, but others have mentioned they get rough idle with a piggyback + CAI. BMS had mentioned if you watch the logs, you can see the boost drop between shifts as the IAT temps start to rise. |
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01-13-2019, 03:38 PM | #11 | |
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01-14-2019, 05:38 PM | #13 | |
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Might be worth a shot. |
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01-21-2019, 11:09 AM | #14 | ||
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01-21-2019, 12:50 PM | #15 |
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I agree with the guys that have said its dependent on the tune that you're running as I'm FBO on a custom BM3 tune and with my last set of stock N55 spark plugs (F30 335i here), on WOT when calling for boost the car would have that hesitation and decided that on a misfire that I had recently, I'd grab the N20 plugs (gapped to 0.22 if I recall correctly). Just had them put in this morning (mind you it's 13 °F here in NY) and the car felt smooth not only in the power delivery but just the rough shifts that I had for a while felt a lot better as I manually roll through the autobox.
Given that you're also in the NY/NJ area like myself, I'll probably take a trip to the car wash in hopes of removing the salt that was dropped on the road when there was no snow storm.. Of course we aren't apples to apples as I'm on a custom tune vs your JB4 but just giving my 0.2 cents as the plugs were my issue and my tuner felt the same as I did when I had the first misfire EDIT: Car was run was successful and definitely turned out to be my spark plugs, shame I didn't do them sooner. Last edited by imperfectluck; 01-21-2019 at 03:08 PM.. |
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01-21-2019, 07:19 PM | #16 |
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01-21-2019, 07:28 PM | #17 | |
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01-21-2019, 08:10 PM | #18 |
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perryo91 Yeah I do get that on the very first shift (less prominent if the auto box is shifting but I feel it more when I row it myself) but I'd probably say that's in part due to the transmission fluid still being cold so as the car warms the trans fluid starts to flow better and do what it does best.
I will say that that clutch slipping feeling I did feel quite a bit more for a while with my old plugs in the very first 1st - 2nd gear shift which used to rub me the wrong way but today felt as if the car were new again like the day I bought it going from 1 - 2 for the first time from a cold start. Never thought the spark plugs could play such a role in how the car functions, guess I should pay attention more to the little things, lol. |
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01-21-2019, 08:21 PM | #19 | |
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I changed my spark plugs about 6 months ago to this part number (pulled from fcpeuro: 12120037582, 12120037575 . Not sure why it's giving me two part numbers. Would you recommend I get the n20 ones like you? I honestly felt the rougher shifting and first morning 1-2 shift right after I went Stg1 lol. What do you think, thanks for your reponse
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Last edited by perryo91; 01-30-2019 at 07:37 AM.. |
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01-21-2019, 08:33 PM | #20 |
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perryo91 Reading through the BM3 thread, I've read of others using either the N20 https://www.fcpeuro.com/products/bmw...ug-12120039664 which I got from fcpeuro also or the NGK as the 1 stop colder is needed when running a more aggressive tune as you noticed going from Stg 1 to 2.
I did pin point the spark plug issue when I went from my custom tune to a more relaxed BM3 OTS map and things felt more natural again. Gapping the n20s to .022" made me smile again. I'll have to look at my mileage to see how long these last me. |
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01-30-2019, 07:38 AM | #21 | |
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02-01-2019, 03:33 PM | #22 |
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perryo91 Given the other discussion here I'd say if your tune isn't a stage 2 then it might not be aggressive enough to warrant the colder plugs N20 plugs. The fact that when going from stock to stage 1 you mentioned the hesitation made me question but you're using a jb4 which I'm not sure which the stg 1 target numbers are like but even when my n55 plugs weren't holding up and I went from my custom tune (gives me an additional ~100 hp / tq over stock), the BM3 stg 2 OTS map made the car feel better as its more relaxed than my custom tune being more aggressive.
What numbers are you putting out with your jb4 on the stg 1? |
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