[vinnie.lml]

Hi all,
Need suggestions and guidance from all about the N54 two step colder plugs.
Recently i was planning to upgrade to two step colder plug and found that NGK 97506 will work.

Then I ordered NGK97506 and once I started the process of changing the plug. It is noticed that two-step colder plugs are longer than the stock plugs ( please see the pic). It will go deeper into the chamber.

Did someone notice the same issue? Is it a dump move to fit this in N54? Is it going to hit the piston?

Please help.

Thank you

[oVeRdOsE.]

This wont be an issue.

I have the exact same spark plug NGK 97506, and car runs fine.

Good practice to compare size, I did not do this, I should have to avoid potential issues, but everything was good.

I had to gap them 0.020''

[Jaronbwall]

Ditto. Same plugs, gapped to 0.020", no issues for about 7k miles, FBO

[N54_Sauce]

I believe the copper washer is there for that purpose. I might be wrong. ��*♂️

[jadams161]

Step 2 colder plugs are not an "upgrade". Unless you are 600HP, the stock plugs are fine. If you really "need" a colder plug, then go with the stock N55 plugs....

[oVeRdOsE.]

Originally Posted by jadams161

Step 2 colder plugs are not an "upgrade". Unless you are 600HP, the stock plugs are fine. If you really "need" a colder plug, then go with the stock N55 plugs....

yep. And the NGK 2 step colder got a bigger tip, so prone to an incomplete combustion, thus less miles per gallon.

B58 coil and 2 step colder plug conversion got a thinner tip, and theoretically you should get a better mpg . But the conversion cost way more than a NGK97506+Eldor coils.

[jadams161]

Not the case at all.. sorry. I run a custom tune in stock plugs with the B58 coils. I've run all the NGK plugs with this setup and produce the most consistent power with stock Bosch plugs.

[oVeRdOsE.]

Originally Posted by jadams161

Not the case at all.. sorry. I run a custom tune in stock plugs with the B58 coils. I've run all the NGK plugs with this setup and produce the most consistent power with stock Bosch plugs.

I dont think you get what I was saying.

thermodynamics. You have a better heat spread and a bigger tip (aka step colder), you'll have for sure worst mpg. Im not even speaking about constant power or detonation here.

Now the B58 sprakplug (94201) are considered as a 2 step colder for a N54 and require b58 coils. However, the B58 plugs (ngk94201) got a smaller tip than the NGK97506, so this is the best option for power and mpg.

[STATIC A$TRO]

Originally Posted by oVeRdOsE.

This wont be an issue.

I have the exact same spark plug NGK 97506, and car runs fine.

Good practice to compare size, I did not do this, I should have to avoid potential issues, but everything was good.

I had to gap them 0.020''

what if ST...

[jadams161]

That's not really how it works. The tip is smaller on the Iridium plugs due to the material, Iridium instead of copper. Iridium last longer than copper, that's why it's used. My comment is that people say the NGK two-step colder plugs are an upgrade which they are not in terms of producing power. This argument over stock plugs versus one step and two-step colder plugs is like beating a dead horse but works for one engine won't work in another It's trial and error.

[oVeRdOsE.]

Originally Posted by STATIC A$TRO

what if ST...

change nothing, heat in the combustion chamber depend on the pressure and incoming mixture temperature.

Depends what is the ignition T° point of your mixture. If the combustion occur before the spark, and it's caused by the plug heat, then you need a colder spark.

Now if the combustion occurs before the spark and it's due to high pressure (= temperature), then you need to change the fuel type or reduce boost


Anyway, from what I seeing with N54, ST or TT, its similar. Around the stock block limit, 2 step colder will avoid issues

Originally Posted by jadams161

That's not really how it works. The tip is smaller on the Iridium plugs due to the material, Iridium instead of copper. Iridium last longer than copper, that's why it's used. My comment is that people say the NGK two-step colder plugs are an upgrade which they are not in terms of producing power. This argument over stock plugs versus one step and two-step colder plugs is like beating a dead horse but works for one engine won't work in another It's trial and error.

according to the # model, they are all iridium.

I agree this is not an upgrade, if there NO use for this, the car will run fine, and according to the spark plug option, you'll get worst mpg. So a downgrade, but wont have any issue.

[AWD Addict]

Originally Posted by jadams161

Step 2 colder plugs are not an "upgrade". Unless you are 600HP, the stock plugs are fine. If you really "need" a colder plug, then go with the stock N55 plugs....

I agree with this. I've been FBO for a long time, and on stock plugs. I've seen precisely zero science on why this would be advisable on any car that's FBO or less.


I've no idea why so many people are talking about this. I think people like inexpensive changes that they can bill as an "upgrade" or as another thing they had to do to handle all their new powAR

[rismo]

Amen

[suspect]

Originally Posted by AWD Addict

I agree with this. I've been FBO for a long time, and on stock plugs. I've seen precisely zero science on why this would be advisable on any car that's FBO or less.


I've no idea why so many people are talking about this. I think people like inexpensive changes that they can bill as an "upgrade" or as another thing they had to do to handle all their new powAR

Do you get timing corrections at WOT after a shift say 3 to 4?