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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Which Spark Plugs Should I get for my Mods: NGK or OEM Bosch



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      09-10-2016, 10:09 AM   #1
sebasupreme
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Which Spark Plugs Should I get for my Mods: NGK or OEM Bosch

Need to get new spark plugs, but I don't know if I should switch to NGK or just get new OEM Bosch plugs? Recommendations?

The car is breaking up..

My mods:

JB4 (Map 7)
E50
VRSF Downpipe
VRSF 7" FMIC
Evolution Racewerkz Charge Pipe
Injen Cold Air Intake

Thanks in advance
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      09-10-2016, 10:42 AM   #2
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Might as well go with the 5992s(correctly gapped) from what I have read.
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Originally Posted by TheAxiom
FYI - I don't drive hard at all. So I'm not interested in more clamping force when I won't use it. Even on my car, I take it easy. It's just too loud to be enjoyable.
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      09-10-2016, 11:06 AM   #3
CantCatchMe
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There are lots of threads on this, look up some of these things that are common.

Go with Bosch. There's no need for NGKs when you're on the stock turbo. You can get Bosch plugs from Amazon for $56 shipped.
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      09-10-2016, 12:16 PM   #4
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Quote:
Originally Posted by sebasupreme View Post
Need to get new spark plugs, but I don't know if I should switch to NGK or just get new OEM Bosch plugs? Recommendations?

The car is breaking up..

My mods:

JB4 (Map 7)
E50
VRSF Downpipe
VRSF 7" FMIC
Evolution Racewerkz Charge Pipe
Injen Cold Air Intake

Thanks in advance

E50 on stock fuel pump? I hope you're keeping a close eye on your logs. With that much %E you should probably run NGK's.
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      09-10-2016, 01:08 PM   #5
tke344
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People are going with N20 plugs gapped at .022 - I just recently ordered a set, hoping to install sometime this week. My mods are similar but I run a meth kit mostly for cooling purposes.
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      09-10-2016, 03:46 PM   #6
sebasupreme
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Quote:
Originally Posted by OneMoreAlex View Post
E50 on stock fuel pump? I hope you're keeping a close eye on your logs. With that much %E you should probably run NGK's.
E40 * and I do.
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      09-11-2016, 10:20 AM   #7
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Get n20 plugs SILZKBR8D8S. They are 1 step colder for n55. Gapped them to .020.
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      09-11-2016, 12:19 PM   #8
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Quote:
Originally Posted by bNks334
Get n20 plugs SILZKBR8D8S. They are 1 step colder for n55. Gapped them to .020.
I read that the N20 plugs should be gapped to .018?
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      09-15-2016, 12:10 AM   #9
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Quote:
Originally Posted by bNks334
Get n20 plugs SILZKBR8D8S. They are 1 step colder for n55. Gapped them to .020.
Is this a proven spark plugs for N55? I'm using NGK 5992 and I'm 40% E85 with no problems. I wonder how many people are now using those spark plugs you mentioned.
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      09-15-2016, 10:56 AM   #10
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Quote:
Originally Posted by WiL335i View Post
Is this a proven spark plugs for N55? I'm using NGK 5992 and I'm 40% E85 with no problems. I wonder how many people are now using those spark plugs you mentioned.
Yes it is if you're running a upgraded turbo NGK or N20 plugs are good. Some people even use the S55 plugs and GT-R plugs now. However, if you're on the stock turbo you'll be fine on Bosch plugs. All of those other plugs run a step colder than OEM ones.
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      09-15-2016, 02:23 PM   #11
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Quote:
Originally Posted by WiL335i View Post
Is this a proven spark plugs for N55? I'm using NGK 5992 and I'm 40% E85 with no problems. I wonder how many people are now using those spark plugs you mentioned.
There seems to be a lot of misinformation out there regarding spark plugs... The NGK 5992 plug is recommended for TUNED N54's. Those plugs are one step colder plugs for the N54. The N55 stock plug already operates 1 step colder than the N54 stock plug. Therefore, the NGK 5992 plug is a stock equivalent plug for the N55. If you have a tuned N55 you want the N20 plug (SILZKBR8D8S) which operates 1 step colder than the stock N55 plug and 2 steps colder than the N54 plug.

Heat Range:

Quote:
The term Heat Range refers to the speed with which a plug can transfer heat from the combustion chamber to the engine head. Whether the plug is to be installed in a boat, lawnmower or race car, it has been found the optimum combustion chamber temperature for gasoline engines is between 500C–850C. Within that range it is cool enough to avoid pre-ignition and plug tip overheating (which can cause engine damage), while still hot enough to burn off combustion deposits that cause fouling.
More boost (psi) = increased cylinder compression = more power = more heat. You can offset the resulting increase in cylinder temperature by running a colder heat range plug.

Quote:
A good rule of thumb is, one Heat Range colder for every 75–100hp added. In identical spark plug types, the difference from one full Heat Range to the next is the ability to remove 70C to 100C from the combustion chamber.
Electrode Gap:

Quote:
Originally Posted by Rahim e92 View Post
I read that the N20 plugs should be gapped to .018?
As far as gap is concerned, The Factory N55 spec is 0.032" same as the N20. A stock car works best when plugs match stock spec.

Quote:
Another consideration that should be taken into account is the extent of any modifications that you may have made to the engine. As an example, when you raise compression or add forced induction (a turbo system, nitrous or supercharger kit) you must reduce the gap (about .004" for every 50 hp you add).
People gap down to .020" because they are pushing more boost/psi than the factory tune.

Conclusion:

If you have an N55, pushing an extra 100hp, you should probably run 1 step colder plugs and decrease the gap down by .008”. That means a gap of roughly .023”. You can shave off another .008” because the stock plug was gapped for economy not performance. You’ll see people recommending anything in-between .018-.025”. All those ranges will work, but you’ll have to do some research for yourself to find out what would probably work best based on how your car is tuned (read the links below for more info on what effects spark plug requirements eg. fuel, timing, ambient temp, baro pressure..).

Cobb, and traditional flash tuning knowledge, reduces ignition advance as compression is increased. This helps offset the excess heat that is produced and helps to prevent knock. This also offsets the need to run a different than factory spark plug. If you go into a custom tuning session with 1-step colder plugs your tuner will probably be able to keep a bit more ignition advance without producing excessive temps and therefore KNOCk (that is if a dyno even shows that you’re able to produce more power with more advance in the first place!! MBT???).

The .018” gap might be more geared toward JB4 users. The addition of E85 and greater ignition advance that it runs changes the spark plug requirements. Jb4 runs the stock timing curve despite the massive increase in compression. Hence an increased tendency to knock and the NEED to run E85 to prevent it. Ultimately, once you get that E85 in the tank you do produce more power... but you're tuned "aggressive" and abusing your fuel pump and injectors.

The aforementioned plugs, gapped to .020", are working perfectly for me on an N55 pushing 20-22psi.

References:

http://www.ngksparkplugs.ca/tech-inf...g-faq.cfm#sp16
https://www.ngksparkplugs.com/about-...rk-plug-basics
https://www.ngk.com/learning-center/...or---do-i-need
http://www.ngk.com.au/spark-plugs/te...rmance-engines

Last edited by bNks334; 09-15-2016 at 03:45 PM.
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      09-15-2016, 02:43 PM   #12
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Damn I wish I have known about all of this. I just recently changed my plugs with this 5992 and not about to shell out another $80. I'll try this N20 plugs asap. Thank you all for this info.
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