02-23-2021, 05:12 PM | #1 |
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N55 spark plug gapping for future tune
The time has come to change my spark plugs and I am looking to add bootmod3 stage 1 on my f30 335i xdrive in the near future, maybe 5k miles. I ordered the NGK SILZKBR8D8S (97506) and bootmod3 recommends to gap them to around .023". Will it be fine if I gap them to that spec with no tune or will it cause a rough idle? Let me know your thoughts and experience. Thanks
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02-23-2021, 05:39 PM | #2 |
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I would start with the stock gap especially for stage 1. Narrow gap is really for higher boost applications.
I would paruse the technical forum for your engine to hear more on spark plugs and gap. Lots of discussion on this topic there. Last edited by 435gc; 02-23-2021 at 05:51 PM.. |
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02-23-2021, 07:36 PM | #3 | |
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Drives: 2015 BMW 335i x-Drive Auto
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The only reason to go to a colder plug with a shorter gap is if you are running very high boost pressures from a Stage2 or higher tune. With so much extra fuel/air density inside the engine cylinder, the spark can have difficulty jumping the longer stock gap. Here's a link to stock plugs that come gapped to stock gap right out of the box. https://www.fcpeuro.com/products/bmw...ch-12120037580 |
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02-23-2021, 08:02 PM | #4 | |
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This is what Pro Tuning Freaks said: https://bootmod3.atlassian.net/wiki/...+and+which+gap |
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02-23-2021, 09:35 PM | #5 | |
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You want the largest gap possible without having misfires. Stock plugs stock gap are proven to work for any stock turbo application, and many push even further with PS2, meth, Emixes, etc. The best approach is to do stock plugs stock gap unless you have problems, then change. |
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02-23-2021, 11:11 PM | #6 | ||
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They neglected to say for Stage2 and above tuned cars. Because Stage1 by default means everything is stock. You may get away with the 97506 that you bought but at $9 per plug I'd just put in stock Bosch plugs and save or sell the others. The 97506 can't improve on the stock plugs on a Stage1 tune, and they might make the engine run less than ideal |
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335, bmw, bootmod3, f30, n55, spark plug change, spark plug gapping, tune |
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