02-14-2020, 04:53 PM | #1 |
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Spark Plug Question
Hello,
I'm shopping for spark plugs and see on FCP the genuine BMW recommended plug listed but also a Bosch option at less than half the price: Genuine BMW Bosch Under "Fitment", Bosch's plug lists M5's and M6's, so it should work, but question is, how different are these plugs, "really"? I am not a fan of paying twice as much for name, but also don't want to run into any issues. Is anyone with an M6 here running the Bosch plugs, and if so, how have they been holding up? Car has the Comp. package, but otherwise stock power-wise. Thanks in advance. - Leo. |
02-14-2020, 05:05 PM | #2 |
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Get the ngk 97506 1 step colder. On the website it does not say it fits. But it is a direct replacement.
The bosch will be the exact same as as the genuine bmw ones. Same manufacturer. https://www.fcpeuro.com/products/bmw...plug-ngk-96987 |
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02-14-2020, 07:58 PM | #3 |
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02-14-2020, 10:30 PM | #4 |
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02-15-2020, 07:40 AM | #5 |
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Im BM3 stage 2 91 octane tune, wanted to be on the mild side due to DCT clutches, and Im getting a hesitation/misfire up top in 3rd,4th,5th gear that was noticeable under WOT. I assume the stock plugs are my issue. After some reading seems most people are between .18-.22, is this accurate? What did you gap them too?
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02-15-2020, 08:33 AM | #6 |
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a colder plug helps remove heat from the combustion chamber through he tip and body of the plug, in essence helping to reduce pre ignition and misfire conditions.
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02-15-2020, 08:39 AM | #7 | |
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I believe they all come gapped stock to something in the .36 range. you should close the gap accordingly. stock plugs will work just fine though. i would suspect though that the car is blowing out the spark when you are misfiring. I had the same issue when i bought mine and changed all of the plugs and coils, with genuine BMW parts, for piece of mind, completely fixed my issue. as a rule of thumb if you are going to change coils or plugs, just do them all at the same time.
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02-15-2020, 08:56 AM | #8 | |
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02-15-2020, 09:47 AM | #9 |
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Has anyone been able to locate a gap tool that goes down to .020” other than the coin style? Which, seems to be a no-no for these type of NGK plugs. All the other gap tools I’ve seen only go down to .025”.
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02-15-2020, 11:25 AM | #10 |
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Go get a proper feeler gauge and the screw cap spark plug gapping tool. I will post a couple links to the tools once i relocate them
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02-16-2020, 04:39 AM | #11 | |
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02-16-2020, 10:33 AM | #12 | ||
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https://www.amazon.com/Stainless-Fee.../dp/B081CSVMMN This for actually measuring the gap And this for re-opening the gap If I happen to make it too tight. https://www.amazon.com/Powerbuilt-64.../dp/B002INZFZW Quote:
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02-24-2020, 07:23 AM | #13 |
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Reporting back after swapping NGK gapped to .020 and new coils. It was a relatively easy but frustrating job, mainly cause of the bridge bolts that hold it down. You'll want a magnetic bit or you'll be dropping and swearing often. When putting the coils back on, for some reason, you'll really want to make sure you hear a click with the harness. When I finished up I had misfires in three cylinders. Couldn't figure out why but took them back apart and made sure everything was good, saw nothing out of the ordinary but when reinstalling the coils, I ensured the harness clicked into place. Everything was good after that.
Car ran rich for a small period of time and cleared up and I don't have the hesitation/miss up top like I did before. Now I have the itch for more power
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02-25-2020, 08:29 PM | #14 | |
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