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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications Sparkplug Gaping Question
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      04-09-2019, 06:36 PM   #1
ziekxq
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Sparkplug Gaping Question

So about 4k miles ago I installed OEM spark plugs - I am wondering if it is safe to gap them to .018?

Another option is the NGK 95770 and gap them to .018 - I heard they are identical to OEM plugs and same heat range.

Another option is NGK 97506KT and gap them to .018.

What I really want to know is if it is safe to gap OEM plug to .018?

I am asking because running more boost is giving me misfires and I am currently on stock gap of .031.

Last edited by ziekxq; 04-11-2019 at 03:41 PM.
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      04-10-2019, 12:03 AM   #2
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I run the 97506's at .020" with no issues, with high boost.
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      04-10-2019, 09:50 AM   #3
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Quote:
Originally Posted by AZ-MCRacer View Post
I run the 97506's at .020" with no issues, with high boost.
Do you run E85? My spark plugs go bad within in a few months. I'm being told it because of the E85 and my custom tune. My mechanic is saying my ignition coils will need to me changed more often also because of that.
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      04-10-2019, 10:22 AM   #4
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Quote:
Originally Posted by AZ-MCRacer View Post
I run the 97506's at .020" with no issues, with high boost.
Are you running 97506 or 97506KT, seems like there are two different versions of these plugs.
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      04-10-2019, 10:23 AM   #5
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Quote:
Originally Posted by pf10 View Post
Do you run E85? My spark plugs go bad within in a few months. I'm being told it because of the E85 and my custom tune. My mechanic is saying my ignition coils will need to me changed more often also because of that.
I am not running E85, I know I would have to change spark plugs every 20k mile vs every 50k mile but I never heard anything about coils.

My old coils were still good but I got them changed any way just because of the miles on them. Plus, on FCP website they are dirt cheap.

Also, I am only getting misfires because of running higher boost. So, I wanted to see what plugs would be best choice or if I could still use OEM plugs with .018-.020 gap.
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      04-10-2019, 10:26 AM   #6
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Ok...

I run 97506 never heard of the KT version
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      04-10-2019, 10:28 AM   #7
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97506 are 2 step colder
97506KT are 1 step colder
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      04-10-2019, 10:32 AM   #8
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Quote:
Originally Posted by ziekxq View Post
I am not running E85, I know I would have to change spark plugs every 20k mile vs every 50k mile but I never heard anything about coils.

My old coils were still good but I got them changed any way just because of the miles on them. Plus, on FCP website they are dirt cheap.

Also, I am only getting misfires because of running higher boost. So, I wanted to see what plugs would be best choice or if I could still use OEM plugs with .018-.020 gap.
did you buy the Genuine BMW one or the delphi? the reason I asked because few ppl on the 3 series forum used the delphi one from FCPEURO and they were having misfires... try changing it back to the original one and see if you have the misfires.... That is why I bought the Genuine BMW one and didnt have an issue from FCPEURO...

Last edited by ey2001; 04-10-2019 at 10:46 AM.
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      04-10-2019, 10:43 AM   #9
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Quote:
Originally Posted by pf10 View Post
97506 are 2 step colder
97506KT are 1 step colder
Thanks, I will go 97506 than and gap them to .020 and see how that works out.
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      04-10-2019, 10:44 AM   #10
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Quote:
Originally Posted by ey2001 View Post
did you buy the Genuine BMW one or the delphi? the reason I asked because few ppl on the 3 series forum used the delphi one from FCPEURO and they were having misfires... try changing it back to the original one and see if you have the misfires.... That is why I bougt the Genuine BMW one and didnt have an issue from FCPEURO...
I did buy the delphi ones dammit lol.

running 17psi boost everything is fine but as soon as boost is raised to 19psi I get misfires so I am thinking it has to do with the spark plugs and the gaping.
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      04-10-2019, 03:54 PM   #11
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I'd say it depends on how much boost you are running. Most should do fine with one step colder plugs. I believe with at least .022 gap. I see people using 2 step colder at .020 gap.
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      04-10-2019, 07:11 PM   #12
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You really need to look at a log at 19 PSI you will need supplemental fueling, I found 17 to be about the limit before I would run lean and misfire without having my PI enabled.

I run Arizona pump E85 with the 2 step colder 97506's. Our pump E85 is really around E52. I was running the BM3 OTS Stage 2 E30 map (+ JB4), but I have been working Cary Jordan on a custom tune.
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      04-10-2019, 08:52 PM   #13
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Quote:
Originally Posted by AZ-MCRacer View Post
You really need to look at a log at 19 PSI you will need supplemental fueling, I found 17 to be about the limit before I would run lean and misfire without having my PI enabled.

I run Arizona pump E85 with the 2 step colder 97506's. Our pump E85 is really around E52. I was running the BM3 OTS Stage 2 E30 map (+ JB4), but I have been working Cary Jordan on a custom tune.
Our E85 is E55 basically, but here are my logs with the new map where car misfires from 3rd to 4th gear pull:

3rd gear pull:
https://datazap.me/u/ziekxq/3rd-gear...og=0&data=3-16

4th gear pull:
https://datazap.me/u/ziekxq/4th-gear...og=0&data=3-16

3rd to 4th gear pull:
https://datazap.me/u/ziekxq/3rd-4th-...og=0&data=3-16

Let me know if you see fueling as the issue on these logs.
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      04-13-2019, 02:07 PM   #14
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Issue was afr was running too rich post gear shift causing engine to misfire.

In any case this could have probably been fixed without swaping out the spark plugs, but at least I am running better gap and colder plugs lol.
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      04-13-2019, 11:01 PM   #15
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Issue was goofball named ziekxq pretending to have modded out F10 with PS2 just like so many others. Post a video or at least start pretending to have an 700hp M5 like faker Stück. Hilarious. You could also say you're moving and have a broken arm like AZ. All great excuses.

I hope you prove me wrong ziekxq... would hate to add you to the list of 5postposers.
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      04-14-2019, 08:37 PM   #16
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Quote:
Originally Posted by Dollar Bill 535 View Post
Issue was goofball named ziekxq pretending to have modded out F10 with PS2 just like so many others. Post a video or at least start pretending to have an 700hp M5 like faker Stück. Hilarious. You could also say you're moving and have a broken arm like AZ. All great excuses.

I hope you prove me wrong ziekxq... would hate to add you to the list of 5postposers.
Lol you're funny. I have a full thread with pictures and everything. Or you could reach out to mike@n54tuning from whom I ordered all my parts or Justin Whitted @ twisted tuning who is doing my tunes.

I also plan to update that post with dyno numbers on pump 93 octane once all tuning is sorted out.

If you want me to record how fast the car is right now, I can do that as well but I dont have go pro or special camera. I also plan on doing 0 to 60 times and such using dragy. But not until all tuning is sorted.

Last edited by ziekxq; 04-14-2019 at 08:50 PM.
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      04-15-2019, 05:09 PM   #17
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Quote:
Originally Posted by Dollar Bill 535 View Post
Issue was goofball named ziekxq pretending to have modded out F10 with PS2 just like so many others. Post a video or at least start pretending to have an 700hp M5 like faker Stück. Hilarious. You could also say you're moving and have a broken arm like AZ. All great excuses.

I hope you prove me wrong ziekxq... would hate to add you to the list of 5postposers.
Quote:
Originally Posted by Dollar Bill 535 View Post
Issue was goofball named ziekxq pretending to have modded out F10 with PS2 just like so many others. Post a video or at least start pretending to have an 700hp M5 like faker Stück. Hilarious. You could also say you're moving and have a broken arm like AZ. All great excuses.

I hope you prove me wrong ziekxq... would hate to add you to the list of 5postposers.

Does this twat has anything better to contribute? I am thinking he himself is a faker!
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      04-15-2019, 07:07 PM   #18
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Quote:
Originally Posted by pf10 View Post
Quote:
Originally Posted by AZ-MCRacer View Post
I run the 97506's at .020" with no issues, with high boost.
Do you run E85? My spark plugs go bad within in a few months. I'm being told it because of the E85 and my custom tune. My mechanic is saying my ignition coils will need to me changed more often also because of that.
What did your car do when your spark plugs went bad
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      04-15-2019, 07:49 PM   #19
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Quote:
Originally Posted by jonobro View Post
What did your car do when your spark plugs went bad
I got a drivetrain malfunction error
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      04-16-2019, 10:44 PM   #20
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Quote:
Originally Posted by jonobro View Post
What did your car do when your spark plugs went bad
My spark plugs were fine, it was an issue with afr running too rich post gear shift. Tuning fixed it but I still installed colder ngk 97506 plug with .020 gap. I am still noticing minor misfires up till 4500rpm, so hoping next map update will fix that issue. Im pretty close to being done with power on 93 octane. Now just need to get minor issues tweaked out.

Car doesnt feel smooth unil 4500rpm, after that its smooth as butter. I dont know how to explain it maybe I should record a video.
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      04-17-2019, 05:17 PM   #21
ziekxq
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Here video of 3rd gear pull for logging. It didnt do the issue that I was facing:
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