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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 > NGK spark plugs?



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      07-22-2007, 11:43 PM   #1
grkm3
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NGK spark plugs?

What kind of plugs come stock on the 335?Has anyone tried running a set of ngk's people got better results using them on bossted M3s and wondered if they would alow a little more timing
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      07-22-2007, 11:52 PM   #2
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What kind of plugs come stock on the 335?Has anyone tried running a set of ngk's people got better results using them on bossted M3s and wondered if they would alow a little more timing
The N54 uses a Bosch spark plug. It's a 12mm thread which is different from other plugs that BMW uses which is a 14mm design. The hex on the spark plug is not your typical 6 point design but rather a 12.

BMW says a special tool us used to removed the spark plug. The socket needs to be thin as well as there isn't enough space on the N54 cylinder head to accept a typical spark plug socket.

I'll try to get more information tomorrow on the spark plug and see if NGK offers anything.
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      07-23-2007, 10:08 AM   #3
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Anyone know where to get the tool or how much it is? I have to replace one asap...
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      07-23-2007, 10:25 AM   #4
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Anyone know where to get the tool or how much it is? I have to replace one asap...
Why?
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      07-23-2007, 10:35 AM   #5
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Why?
+1

I'd imagine unless you did something odd a replacement plug could be had at the dealer and they'll install it for you
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      07-23-2007, 10:45 AM   #6
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stock spark plug is a Bosch ZGR6STE2 and retail is $18.00 per plug.
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      07-23-2007, 11:53 AM   #7
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What kind of plugs come stock on the 335?Has anyone tried running a set of ngk's people got better results using them on bossted M3s and wondered if they would alow a little more timing
Colder plugs would only help if the stock plugs were causing detonation. I dont think thats a problem with the N54. M3's came with relatively hot plugs from the factory in a NA configuration, which is why guys using forced induction did a little better with a more suitable plug. BMW designed the 335 engine for high compression and boost, which would include much cooler plugs than they would use in a NA engine.
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      07-23-2007, 06:29 PM   #8
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Quote:
Originally Posted by turbodan View Post
Colder plugs would only help if the stock plugs were causing detonation. I dont think thats a problem with the N54. M3's came with relatively hot plugs from the factory in a NA configuration, which is why guys using forced induction did a little better with a more suitable plug. BMW designed the 335 engine for high compression and boost, which would include much cooler plugs than they would use in a NA engine.
+1... I was just going to say the same thing. I also switched to NGK copper plugs that were two steps colder then stock on my s2k after I went turbo.
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      07-23-2007, 07:07 PM   #9
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I went with a set of NGK BPR8ES plugs in my 528 turbo. Coming from the stock eta Bosch WR9LS it was good for another pound of boost. But thats a different animal next to the 335.
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