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      01-11-2019, 01:46 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, 01:58 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, 02:03 PM   #3
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Quote:
Originally Posted by G.Newt View Post
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).
Have you noticed any difference? What is the exact name so i know what to order?
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      01-11-2019, 03:32 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, 03:50 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, 03:50 PM   #6
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Quote:
Originally Posted by YuminNuman View Post
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.
"The biggest problem is that running a colder plug when it isnít needed, is that it will foul up quickly. This happens because the plug tip doesnít stay hot enough to burn off the carbon deposits, and so a build up occurs. Another common problem is that colder plugs can make the car harder to start when itís cold outside."

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, 07:44 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, 06:08 PM   #8
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I'm guessing your hesitation is due to intake air temps, and not spark plug issues.
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      01-12-2019, 06:12 PM   #9
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Quote:
Originally Posted by Wires View Post
I'm guessing your hesitation is due to intake air temps, and not spark plug issues.
You had the same issue? Anything to help keep them down other than meth?
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      01-12-2019, 06:17 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, 04:38 PM   #11
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Quote:
Originally Posted by Wires View Post
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.
That describes it pretty well same happens here. Looking forward to some solution in the future hopefully. I already have an intake and the idle is fine with the jb4
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      01-14-2019, 01:44 PM   #12
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My engine idles normal and fine with the bms intake + JB4.
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      01-14-2019, 06:38 PM   #13
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Quote:
Originally Posted by B58SP View Post
That describes it pretty well same happens here. Looking forward to some solution in the future hopefully. I already have an intake and the idle is fine with the jb4
Wrapping the intake pipe might help. You can get self-adhesive thermo-blanket at many speed shops. We used it on a project 10 years ago to lower the air box temps on a power sport engine. If memory serves me correctly, it reduced the airbox self-heating with the engine running by 4-5C.

Might be worth a shot.
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