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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > *Urgent* What plugs/gap needed for tuned N55? OEM continues to break in 5th/6th gear!



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      03-07-2017, 07:21 PM   #1
YouAreMyWorld
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*Urgent* What plugs/gap needed for tuned N55? OEM continues to break in 5th/6th gear!

OEM plugs keep on breaking and causing misfires. Which plugs are needed to prevent this?

Logs: http://datazap.me/u/youaremyworld/lo...og=0&data=3-21

Log 2: http://datazap.me/u/youaremyworld/lo...og=0&data=3-21

Log 3 (multiple logs in one): http://datazap.me/u/youaremyworld/lo...og=0&data=3-21

Plugs keep on breaking when in 5th/6th gear and pushing foot down at cruising speeds when at 60mph/2,000-2,500rpm! (I've read that most plugs that are used in the N54 can be used for the N55 as well).

Thank you!
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      03-07-2017, 08:17 PM   #2
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I was told .0022 gap on NGK Laser Iridium plugs.
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      03-07-2017, 08:20 PM   #3
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.022" on NGK 5592/95770
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      03-07-2017, 08:20 PM   #4
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^ That's the gap for tuned N54's for sure, running REALLY high boost maybe even .020". But check if thats the same for N55's...
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      03-07-2017, 08:25 PM   #5
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Thanks you guys, just had them installed gapped to .022 as recommended

Will post back momentarily after test drive.
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      03-08-2017, 11:01 AM   #6
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Quote:
Originally Posted by YouAreMyWorld View Post
Thanks you guys, just had them installed gapped to .022 as recommended

Will post back momentarily after test drive.
How were they? I'm getting corrections on my logs as well on new OEM plugs so I definitely need to replace them -- was thinking of NGK gapped at .02
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      03-08-2017, 02:17 PM   #7
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Quote:
Originally Posted by flexbrah View Post
How were they? I'm getting corrections on my logs as well on new OEM plugs so I definitely need to replace them -- was thinking of NGK gapped at .02
Waiting to hear back from Ken as we're working on keeping my fuel pressure from dipping below 2,000psi. Immediately after installation though, my car felt more "lively" as if a bit more power is on tap. Definitely feels great and no more misfires.

Also, Ken (WedgePerformance/my Tuner) recommends gapping to .018", but unfortunately I wasn't aware of that until after installation. I personally should be fine since I'm on stock turbo (N55), but you High Boost N54 guys would probably be best served gapping to .018" as a "replace and forget" mentality.

Here's a log: http://datazap.me/u/youaremyworld/lo...42-43-44-45-46

Running aggressively on feeble 91 ACN octane. Car feels very strong and happy, but we're not quite done yet.
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      03-08-2017, 03:06 PM   #8
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Our cali gas sucks. I run stage 1 and was getting a lot of corrections. My car was much happier when I switched to costco 91 because there could be up to 10% ethanol in it
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      03-08-2017, 06:01 PM   #9
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Quote:
Originally Posted by unrealii View Post
Our cali gas sucks. I run stage 1 and was getting a lot of corrections. My car was much happier when I switched to costco 91 because there could be up to 10% ethanol in it
Costco is also Top Tier Gas, so definitely better then other stations. I think Chevron may be in your area too, also Top Tier.
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