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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 > Anyone considered using S55 (F80 M3) spark plugs?



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      Today, 05:58 AM   #1
bradsm87
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Anyone considered using S55 (F80 M3) spark plugs?

The S55 still uses the same coils as the N54 but uses a new spark plug. A couple of pics online show that the spark plugs have ///M printed on them. It appears very similar to an N55 spark plug.

It's listed as "RB ZMR5TPP330" - 12120039634

The N55 spark plug is a Bosch ZR5TPP33S. Does anybody know how to decode the Bosch part numbers and give an idea about what the difference between an N55 and S55 spark plug?
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      Today, 07:39 AM   #2
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Id venture to guess that you should run what is called for in our motors.. I don't think M spark plugs will add any hp nor be any cheaper so whats the point?
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      Today, 07:46 AM   #3
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What would the benefit be? Unless you know them to be in a different heat range, there's no reason to attempt it. There's nothing magical about ///M spark plugs.
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      Today, 08:27 AM   #4
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I was thinking that they might be less likely to misfire under high boost by using a different electrode or ground design compared to N55 plugs maybe.
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      Today, 10:39 AM   #5
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If it has an M badge it adds at least 10-15 WHP.

The stock spark plugs are fine under high boost. They just need to be changed every 25,000 miles. This is simply because the gap increases over time.
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      Today, 10:41 AM   #6
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Quote:
Originally Posted by bradsm87 View Post
I was thinking that they might be less likely to misfire under high boost by using a different electrode or ground design compared to N55 plugs maybe.
They may be in a different heat range, i'm not sure. But truly, there's nothing unique or exotic about them. The OE ignition bits on N54s are pretty solid, some folks run NGKs to go a step colder at FBO and higher type power levels.
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