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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Proper Spark Plug Gap for N55



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      04-05-2013, 05:45 PM   #1
actionj_99
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Proper Spark Plug Gap for N55

Guys,

What is the correct factory gap for N55 engine? Is it 0.7mm?

I'm a bit confused because I just ordered the ZR5TPP33S Bosch branded plugs from ECS and on the box its labeled 0.8mm

I measured them on a cheap spark plug gauge and they are indeed ~0.8mm

I then took my original plugs out of my engine and measured them at ~0.85mm!

The car only has 26K miles and my wife drives it most of the time, so can someone weigh in on what I should set the gap to?

Thanks,
Sam
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      04-05-2013, 07:06 PM   #2
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Keep in mind the gap increases as time / miles go by. I won't recommend re gapping the new ones as its the correct gap. Just throw them in and forget about it.
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      04-05-2013, 08:12 PM   #3
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^ this +1

especially those of us running tunes, FBO, meth etc - ur spark plugs will wear faster - it's totally ok to swap them at 20k... I am getting ready to swap mine soon and I'm only at 11K ... I'll take a couple out and measure them... I'm sure I'm not at ~0.8mm lol
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      04-05-2013, 09:05 PM   #4
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Damn I guess I should change my spark plugs I'm at 27k. How much does a shop charge to do it BMW? I don't have my tools up with me in orlando
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      04-06-2013, 07:28 AM   #5
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Quote:
Originally Posted by fasteddie222 View Post
Damn I guess I should change my spark plugs I'm at 27k. How much does a shop charge to do it BMW? I don't have my tools up with me in orlando
I'm fairly certain BMW won't do it unless your FOB reads that they are out of tolerance.... it's under the maint program for them to not even look at them until 40k (don't quote me on that)
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      04-06-2013, 10:23 AM   #6
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Quote:
Originally Posted by madmanhiker View Post
I'm fairly certain BMW won't do it unless your FOB reads that they are out of tolerance.... it's under the maint program for them to not even look at them until 40k (don't quote me on that)
Do you know how much a local shop charges? Also which spark plugs do you guys recommend. Sorry I don't mean to thread jack.
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      04-06-2013, 03:42 PM   #7
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Thanks... I kept the gap @ 0.8mm and all seems well. Will log a few runs with my COBB to verify.

BTW: will be posting a complete video DIY as soon as I finish editing the footage.

UPDATE: Part 1 of the DIY video is here:

http://www.e90post.com/forums/showpo...7&postcount=13

Last edited by actionj_99; 04-08-2013 at 12:54 PM.
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      11-10-2014, 08:52 PM   #8
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If you are running really high boost on upgraded turbos, you might want to make the gap a bit tighter. Spark blowout will be an issue. Just an fyi based on what I've been reading about with different misfire issues people have had and what they have done to remedy it.
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      11-10-2014, 09:51 PM   #9
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Quote:
Originally Posted by madmanhiker View Post
I'm fairly certain BMW won't do it unless your FOB reads that they are out of tolerance.... it's under the maint program for them to not even look at them until 40k (don't quote me on that)
I believe n54 is 45k (3rd oil change) and n55 is 60k (4th oil change).
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      11-13-2014, 09:14 AM   #10
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Quote:
Originally Posted by mike5809
Quote:
Originally Posted by madmanhiker View Post
I'm fairly certain BMW won't do it unless your FOB reads that they are out of tolerance.... it's under the maint program for them to not even look at them until 40k (don't quote me on that)
I believe n54 is 45k (3rd oil change) and n55 is 60k (4th oil change).
^^This. Unless you have the PPK on the N55. If that's the case, they will change them at 45K as well.
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      04-08-2016, 05:39 PM   #11
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Old thread but gap should be at .280inches if you have inch gap tool instead of metric. That is stock for n55b30a engines
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      04-10-2016, 10:55 AM   #12
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I think you mean .028". A .28" gap is over a quarter of an inch.
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      04-12-2016, 05:55 AM   #13
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I gapped mine at .022-.025" Not taking a chance on spark blow out. Runs MINT and strong.

The platinum/iridium plugs don't really wear the gap at all with under 30K miles. My plugs had almost 45K miles on them, and they all still had a .029-.030" gap.
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      04-12-2016, 08:16 AM   #14
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I was getting misfires with the "stock" gap on my pro-tune.

I changed to a colder N20 plug and gapped it down to .018" per Dzenno's instructions at PTF. I would recommend this if you are running a tune...
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      04-12-2016, 08:31 AM   #15
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Quote:
Originally Posted by madmanhiker View Post
I'm fairly certain BMW won't do it unless your FOB reads that they are out of tolerance.... it's under the maint program for them to not even look at them until 40k (don't quote me on that)
They will replace them every 30k miles.. If you have the maint. program then you are g2g.
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      04-12-2016, 11:30 AM   #16
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Quote:
Originally Posted by Delta0311 View Post
They will replace them every 30k miles.. If you have the maint. program then you are g2g.
You must have a friendly dealer. I had two tell me they are scheduled at 60k and wouldn't do them sooner. Other members said the same on here, there was just a thread about it a few weeks ago. It used to be 45k on the N54.
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      04-12-2016, 11:38 AM   #17
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Quote:
Originally Posted by JETmn View Post
You must have a friendly dealer. I had two tell me they are scheduled at 60k and wouldn't do them sooner. Other members said the same on here, there was just a thread about it a few weeks ago. It used to be 45k on the N54.
It is supposed to be every 30k.. I had mine done at 30k and it was not an issue.
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      04-12-2016, 01:17 PM   #18
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Quote:
Originally Posted by Delta0311 View Post
It is supposed to be every 30k.. I had mine done at 30k and it was not an issue.
Sorry, that is incorrect. Per BMW it is 60k. Please find a source that says it is 30k.

This tech bulletin PDF from BMW shows 45k for the N54 and 60k for N55, page 12 right under the highlighted portion.

https://www.google.com/url?sa=t&rct=...oL7Fy-PUFULgiA
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      04-12-2016, 01:21 PM   #19
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Quote:
Originally Posted by JETmn View Post
Sorry, that is incorrect. Per BMW it is 60k. Please find a source that says it is 30k.

This tech bulletin PDF from BMW shows 45k for the N54 and 60k for N55, page 12 right under the highlighted portion.

https://www.google.com/url?sa=t&rct=...oL7Fy-PUFULgiA
Open Road BMW in NJ change mine at 40k, no questions asked.. Sorry I did make a mistake earlier, it should be 40k not 30.
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      04-13-2016, 10:58 PM   #20
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Quote:
Originally Posted by Cory S View Post
I gapped mine at .022-.025" Not taking a chance on spark blow out. Runs MINT and strong.

The platinum/iridium plugs don't really wear the gap at all with under 30K miles. My plugs had almost 45K miles on them, and they all still had a .029-.030" gap.
.022 is what I have read in several places as well.
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