[koryrykman]

... yep one step colder especially if your running more boost like JB4
I went w factory plugs from the M3/4. They're pregapped and work beautifully.

[ITSSTI]

Originally Posted by koryrykman

... yep one step colder especially if your running more boost like JB4
I went w factory plugs from the M3/4. They're pregapped and work beautifully.

Did you go with something like this? Or straight from the dealer?

https://www.fcpeuro.com/products/bmw...pe-12120039634

So much back and forth I cant decide. I definitely want a heat range colder, but there seems to be some questioning between NGK/Bosch

[Insane435]

Originally Posted by ITSSTI

Did you go with something like this? Or straight from the dealer?

https://www.fcpeuro.com/products/bmw...pe-12120039634

So much back and forth I cant decide. I definitely want a heat range colder, but there seems to be some questioning between NGK/Bosch

just get them online, go a heat range cooler. I have the NGK recommended from PTF. nothing wrong with them. Car ran smoother with them.

[enjoythemusic]

Like you, read LOTS of threads.... came away confused. NKG are fine. Am still using virtually new BMW here, yet next change will be NKG and gapped around 22.

[Triple88]

Originally Posted by enjoythemusic

Like you, read LOTS of threads.... came away confused. NKG are fine. Am still using virtually new BMW here, yet next change will be NKG and gapped around 22.

Are you talking about going with the NGK 5992 or the 97506?

[koryrykman]

Originally Posted by ITSSTI

Did you go with something like this? Or straight from the dealer?

https://www.fcpeuro.com/products/bmw...pe-12120039634

So much back and forth I cant decide. I definitely want a heat range colder, but there seems to be some questioning between NGK/Bosch

[QUOTE=ITSSTI;23227090]

I went straight to the dealer and asked for M4 spark plugs. They're the same part number as M2 and M3

They were like $112 for the set.

I ran the same plugs on my N20 for over 1 year and they worked perfectly. On a tuned car you can really notice the smoother power band. No more hesitation or dead spots on acceleration.

[enjoythemusic]

Originally Posted by Triple88

Are you talking about going with the NGK 5992 or the 97506?

i think the later... i think. Look, just get plugs, install, and enjoy. How much pressure and E85 / meth you pushing? Seems that guys pushing SERIOUS stuff get into spark too.

Am right now using the M2 plugs, seems fine to me as am not racing her and she runs nice and cool even here in Florida. Make sure you have a nice BIG IC too of course.

BTW, nice cat and almost got that one. Decided on the Fabspeed HJC catted and should be here soon. Did you do the oil cooler mod?

[Triple88]

Originally Posted by enjoythemusic

i think the later... i think. Look, just get plugs, install, and enjoy. How much pressure and E85 / meth you pushing? Seems that guys pushing SERIOUS stuff get into spark too.

Am right now using the M2 plugs, seems fine to me as am not racing her and she runs nice and cool even here in Florida. Make sure you have a nice BIG IC too of course.

BTW, nice cat and almost got that one. Decided on the Fabspeed HJC catted and should be here soon. Did you do the oil cooler mod?

Im just on Map 2 so nothing serious just have never gapped plugs/ will probably have the shop install the plugs so I want to make sure to get them right before I put them in.

Ive been loving the Cat although I wish I went with the FabSpeed, I haven't had a CEL yet but i have to pass emissions soon so i should've just spent the extra to get the FabSpeed to have that piece of mind. Havent done the oil cooler mod, didn't see that one around, I don't push it hard, just zip around town here and there.

[harkes]

Originally Posted by Anthony235

The more boost/hp you make the hotter your engine/spark plug gets. It can get so hot that it will ignite the fuel before the spark from the plug actually ignites it. This can cause ping/knock.

Colder plugs help to prevent this. In identical spark plug types, the difference from one full heat range to the next is the ability to remove 70°C to 100°C from the combustion chamber.

E85 also helps prevent this with it's higher igniting temperature.

Ethanol/methanol burn slower and cooler than gasoline as far as I know

[harkes]

Originally Posted by badbread

Can someone explain why you need to use something other than the OEM Bosche plugs on the stock turbo? Are your logs showing timing corrections? Are you getting misfires?

I really don't get it, from what I've learned from multiple tuners the stock OEM plugs are fine for almost all N55 applications, unless you get way into the 650+HP range the OEM plugs work well.

Even harkes post above gives hard data showing the OEM plugs ran better than aftermarket.

I just don't get it, I see spark plugs threads/chats all the time with no reason what so ever as to why the switch.

I'd love to see some logs showing an actual improvement from different plugs (not old worn out OEM's vs new aftermarket)

After market / cooler plugs are highly overrated I'd say. The factory plugs at factory gap is good for +500whp according my experience.

[enjoythemusic]

Originally Posted by harkes

After market / cooler plugs are highly overrated I'd say. The factory plugs at factory gap is good for +500whp according my experience.

EXACTLY, and why i never bothered other than changing stock plugs to M2 version at around 30,000 miles, which is also when we did the Big Turbo, etc mods. Only running 93 octane pump gas here.

As i said previously, after reading MANY sprark plug threads it seems only the guys pushing SERIOUS power need to then get plugs done (other than stock). JMHO YMMV

Also do the oil cooler mod if you want to add in helping to keep temps down a bit (during normal driver and a bit of pushing here and there.... yet tracking is what it is temp-wise so BIG IC, etc helps).

Again, JMHO.

PS TRIPLE88: Oil cooler mod is by AD Engineering
www.1addicts.com/forums/showthread.php?t=1224062
Preferred it over the always-open Burger as AD Engineering unit stays closed until around 95C and not just fully open all the time like the Burger. As you're in Chicago, you prob don't need it as here in HOT FL.... summers are brutal.

[Anthony235]

Originally Posted by harkes

Ethanol/methanol burn slower and cooler than gasoline as far as I know

Oops! Lower temp is what I meant. Fixed.

[ITSSTI]

I installed NGK 5992s less than 1k miles ago. Checked them today after the car started acting funny Sunday. Long story short, they were all loose. I torqued them at install to 23Nm. Is this just an NGK thing? Huge pain in the ass if they need tightening that often.

[AGONXF30]

Quick question.

Can I run S55 plugs (RB ZMR5TPP330) in a stock N55? Reason why I am asking is because they are 5.21 USD at FCP Euro, that's nearly 50% less than stock ZR5TPP33S plugs which are 9.89 USD.

I do plan on adding a JB4 soon, but I doubt that will require more than stock plugs.

[enjoythemusic]

Yes, that's what i'm using right now. Stock gap.
http://www.bimmerworld.com/Engine/Ig...M5-F13-M6.html

[AGONXF30]

Originally Posted by enjoythemusic

Yes, that's what i'm using right now. Stock gap.
http://www.bimmerworld.com/Engine/Ig...M5-F13-M6.html

Put the S55 plugs in the N55 and there are no issues. Runs better, but primarily due to the old plugs being that, old.

[Polo08816]

Originally Posted by ITSSTI

I installed NGK 5992s less than 1k miles ago. Checked them today after the car started acting funny Sunday. Long story short, they were all loose. I torqued them at install to 23Nm. Is this just an NGK thing? Huge pain in the ass if they need tightening that often.

Strange...

[enjoythemusic]

Originally Posted by AGONXF30

Put the S55 plugs in the N55 and there are no issues. Runs better, but primarily due to the old plugs being that, old.

Probably right, agreed. Seems to me the only guys with 'real-world' spark plug problems are those pushing 20+PSI ... those seeking around 500HP or higher.

[tmanm3]

Originally Posted by koryrykman

... yep one step colder especially if your running more boost like JB4
I went w factory plugs from the M3/4. They're pregapped and work beautifully.

I am doing the same next week. I am pulling jb4 for bootmod3 and switching plugs to Stock m3/m4 also. This was recommended by shop I'm doing the tune at also.

He stated the plugs are good as long as I don't throw on different turbos.

[JaredG_F30]

FWIW

"NOTE: S55 OEM plugs are highly prone to cracking even on stock vehicles. Some have used them in the past on their N55 motors without realizing the heat range is identical and they're in fact of worse quality than N55 OEM plugs. We don't suggest using the S55 OEM plugs when tuning your motors and the NGK SILZKBR8D8S (97506) have been found to be far better. "

https://bootmod3.atlassian.net/wiki/...+and+which+gap

[AlpineWhite_F10]

Hello everyone... today I bought bosch ZR5TPP33S for my car with MHD Stage 1 tune and gapped them on 0.022.. is this nice setup? or it doesn't needs that gap?

[Seba77W]

Originally Posted by AlpineWhite_F10

Hello everyone... today I bought bosch ZR5TPP33S for my car with MHD Stage 1 tune and gapped them on 0.022.. is this nice setup? or it doesn't needs that gap?

Well to be honest. MHD recommends stock plugs and gap. Even for me and I'm running my 435i with MHD Stage 2+ 95 oct tune. All though I did replace my plugs with the NGK 97506 1 step colder plugs, which I believe are the oem N20 plugs. They were pre-gapped to about .030 so I left it at that and it's been running fine. MHD just posted their m135i build mod list and they also used the NGK 97506 plugs.