[hayko_M340]

Hello, looking into changing plugs on my M340i, nearing 28k miles. I saw the differences between the normal B58 and B58TU1 plugs which many people don't realize. Majority of the time I run stock 91 tune, but once in a while bump up the boost with E40 mix for a tank or two. Would NGK 94201 plugs be a good choice or should I stick to OEM plugs? Also does anyone know the stock gap and what would be a happy medium for both performance and reliability? Heard .20-.22 can be a bit aggressive and cause a misfire or slight hiccups on a stock tune. I was thinking maybe .25? If anyone has any insight or experience with the two that would be a great help. Thanks!
Link for NGK: https://burgertuning.com/products/ngk-94201-spark-plug
Link for OEM Updated B58TU1: https://www.getbmwparts.com/oem-part...ug-12122455258

[Mr Gravy]

Originally Posted by hayko_M340

Hello, looking into changing plugs on my M340i, nearing 28k miles. I saw the differences between the normal B58 and B58TU1 plugs which many people don't realize. Majority of the time I run stock 91 tune, but once in a while bump up the boost with E40 mix for a tank or two. Would NGK 94201 plugs be a good choice or should I stick to OEM plugs? Also does anyone know the stock gap and what would be a happy medium for both performance and reliability? Heard .20-.22 can be a bit aggressive and cause a misfire or slight hiccups on a stock tune. I was thinking maybe .25? If anyone has any insight or experience with the two that would be a great help. Thanks!
Link for NGK: https://burgertuning.com/products/ngk-94201-spark-plug
Link for OEM Updated B58TU1: https://www.getbmwparts.com/oem-part...ug-12122455258

Hey there

I'm doing the same thing right now, my plugs just got delivered. My bud with gen 1 b58 just replaced his and gapped to .022 on e40 mix, runs fantastic.

I will be doing a .022 gap with the ngk94201 - been running stock plugs at stock gap. I run MHD stage 2 and alternate between 91 and e40 map. Stock plugs have been okay so far, I'm at 23k miles.

I'll let you know how it runs versus stock - I'm installing on the 30th as I'm out of town.

[hayko_M340]

Originally Posted by Mr Gravy

Hey there

I'm doing the same thing right now, my plugs just got delivered. My bud with gen 1 b58 just replaced his and gapped to .022 on e40 mix, runs fantastic.

I will be doing a .022 gap with the ngk94201 - been running stock plugs at stock gap. I run MHD stage 2 and alternate between 91 and e40 map. Stock plugs have been okay so far, I'm at 23k miles.

I'll let you know how it runs versus stock - I'm installing on the 30th as I'm out of town.

Any updates?

[xnick101]

Most of the A90 supra guys run NGK 94201's. Should be fine.

[Mr Gravy]

Originally Posted by hayko_M340

Any updates?

I don't notice a a huge difference. It feels a bit smoother when I get on the pedal.

After looking at my plugs though, I would recommend changing them. A lot of buildup on the champion plugs, I just don't think the quality is anywhere close.

Just my opinion, let me know what you do

[chenry]

Originally Posted by Mr Gravy

I don't notice a a huge difference. It feels a bit smoother when I get on the pedal.

+1
I would say the same about my experience with my .022 gapped NGK plugs

[kuzdu]

i run the NGK 94201 with .022 gap on the b58. runs well, after about 9k my plugs has crud on them could be the E40 mix im using. i have about 8k miles on the current ngk, i will wait for spring to take one out and see if they need changing.

[hayko_M340]

Originally Posted by kuzdu

i run the NGK 94201 with .022 gap on the b58. runs well, after about 9k my plugs has crud on them could be the E40 mix im using. i have about 8k miles on the current ngk, i will wait for spring to take one out and see if they need changing.

Just did an Oil Change, brakes all around, and swapped out to NGK 94201 gapped to .24 for my 30k service and I can definitely tell the difference. Didn't want to go to aggressive on the gap since I'm not always running my Stage 2 E50 Tune and mainly on 91 pump gas stock tune so .24 feels just fine. No shakiness at idle and runs so smooth. My stock plugs at 30k miles actually looked pretty good despite running more burbles and e85 throughout the miles. Highly recommend to anyone considering it, glad I pulled the plug and did it.

[Mastamoe]

Originally Posted by hayko_M340

Just did an Oil Change, brakes all around, and swapped out to NGK 94201 gapped to .24 for my 30k service and I can definitely tell the difference. Didn't want to go to aggressive on the gap since I'm not always running my Stage 2 E50 Tune and mainly on 91 pump gas stock tune so .24 feels just fine. No shakiness at idle and runs so smooth. My stock plugs at 30k miles actually looked pretty good despite running more burbles and e85 throughout the miles. Highly recommend to anyone considering it, glad I pulled the plug and did it.

How are those 94201s holding up?

[hayko_M340]

Originally Posted by Mastamoe

How are those 94201s holding up?

They've been great, idles smooth gapped to 0.24' still on stock tune majority of the time but when on Stage 2 91 or E40 map it pulls hard. Even noticed a difference stock, much more linear power delivery just felt much more smooth. No hiccups whatsoever highly recommend.

[bimmerstar]

Any benefit to running stock OEM plugs at smaller gap or is it best to just go to the NGK 94201s?

[k4sh_90]

Hitting the mileage where I should look into changing my plugs. Checking out NGK, and their site saying the 96206 is the plug for the B58TU.

[jpowers36]

That’s the right one. That’s what I used and installed prior to my stage 2 MG Flasher OTS tune. Gap is stock (recommended by MG Flasher). No issues whatsoever. Spent $103.

[k4sh_90]

Originally Posted by jpowers36

That’s the right one. That’s what I used and installed prior to my stage 2 MG Flasher OTS tune. Gap is stock (recommended by MG Flasher). No issues whatsoever. Spent $103.

Nice, thanks for the confirmation. I’m not tuned myself, just looking for a replacement for the OE Champion plugs.

[Rom207]

I will wait for spring to take one out and see if they need changing.

[jpowers36]

Originally Posted by Rom207

I will wait for spring to take one out and see if they need changing.

How many miles do you have?

I think I have one of the highest mileage M340i around, 103k. I did plugs at like 90-95k and honestly didn’t look too bad and car still started/drove/ran fine.

[g20_ghost]

I’ve got a 2020 m340i. I need to get my spark plugs changed but the website says these won’t fit ? But I keep seeing others say they are running the same exact ones. Can anyone help??

https://www.fcpeuro.com/products/bmw...-94201#fitment

[MichaelNRW]

The original B58TU1 spark plugs with the part number 12122455258 are the same as NGK SILZKGR8E8S (96206).
They´re also used in the G80 just with a different part number but the same supplier number.
No need to adjust the gap with stock turbo.

[g20_ghost]

Originally Posted by MichaelNRW

The original B58TU1 spark plugs with the part number 12122455258 are the same as NGK SILZKGR8E8S (96206).
They´re also used in the G80 just with a different part number but the same supplier number.
No need to adjust the gap with stock turbo.

Got it, do these look like the correct ones for my 2020 m340i ?

https://www.fcpeuro.com/products/bmw...dium-ngk-95248

[MichaelNRW]

Originally Posted by g20_ghost

Got it, do these look like the correct ones for my 2020 m340i ?

https://www.fcpeuro.com/products/bmw...dium-ngk-95248

Yes, looks good to me.

[g20_ghost]

Originally Posted by MichaelNRW

Yes, looks good to me.

Cool thanks for the help, just ordered them and should be here within a couple days.

Also if you don’t mind maybe you can help me with this below on another thread ?

I’ve linked it down below appreciate it

https://www.bimmerpost.com/forums/sh...php?p=31199604

[aci4]

Originally Posted by MichaelNRW

The original B58TU1 spark plugs with the part number 12122455258 are the same as NGK SILZKGR8E8S (96206).
They´re also used in the G80 just with a different part number but the same supplier number.
No need to adjust the gap with stock turbo.

So is there a difference between the NGK 96206 vs 94201? You mention the 96206 is for the B58TU1 (2020 m340i) but I noticed the folks earlier in the thread running the 94201 version on their B58TU1 engines. I’m also not tuned.

Which ones should I go for? Or should I be looking at a different brand? I don’t want to mess with changing the gap so i’ll just run whatever it comes with. I’m at 42k miles and thinking of changing them myself.

Thank you for all the help!