Spark plugs for turbo

[Boss Paco]

Originally Posted by jamesm

hell i don't know, don't really care. i'm a drivability guy. the car makes more power than i can use. i have maps for 9.5, 11, 12.5, and 14 psi. it'll roast the tires on a 2-3 shift on dry pavement, if that means anything. i usually just drive around on the 9.5psi map.

last time it was on a dyno it made 259whp on a mustang @ ~8.5psi. going to a dynojet for some tuning monday, maybe i'll throw it up on a higher boost map then.

I hear you on that. As long as the car performs well and is within its boundaries of safety and reliability, I'm happy. The whp question was more to see if you're 500+ or just like me (about 250-300whp).


Did you notice spark blow out or did you just adjust the gap to be on the safe side? Oh, and are you running E or 91/93 pump? Here in OK, we get pisswater 91 and 93 is about as much as 101. Good thing E85 (82% consistently year around) is plentiful!

[Gixxersixxerman]

Hate bumping an old thread, but figured better then starting a new one, I just installed a KW C38 with the smaller high boost pulley, Chruch went to dyno it but the tune was no good, and we couldn't log and a host of issues. So KW sent me a map to try out and it was much better, all the detonation and knock was gone.. Problem was a misfire, I figured the coil may have went out so I was going to change position and see if it stayed with #3.. Then decided to pull the plug, not sure what the fuss was, but 20 mins later on a more then warm engine I got the right side plugs out.. Here is what I found





Spent 15 more mins and got the left side out and they looked fine. I'm changing all 4 but was wondering about the gap, I read to gap them slightly smaller.. What are you FI guys tapping them at???

[SmsAlSuwaidi]

your first problem was that you went to church @Gixxersixxerman


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[King Tut]

Originally Posted by Gixxersixxerman

Hate bumping an old thread, but figured better then starting a new one, I just installed a KW C38 with the smaller high boost pulley, Chruch went to dyno it but the tune was no good, and we couldn't log and a host of issues.

The tune must have been very far off to do that to a spark plug. How was he tuning without being able to log? What basemap did he start out with? I would find another tuner. When I pulled mine, I gapped them to a little bit under what the factory service manual called for which I believe ended up being .031.

[spitfire481]

i ran slightly smaller gapped oem plugs for almost 20k miles on my avo kit. at 11psi on pump, 18 on e85. when we put my built motor in i put stock plugs in and kept them at the stock gap. i wanted to close them up a hair but forgot to. 26psi making 500+ with no misfires or issues. that tune must have been pretty bad to melt the tips like that

[Gixxersixxerman]

Well I have the same setup as a customer BRZ a and Church put 408 to his dyno packs.. On e85, 309 on 91.. Mine is a auto and eVerytime we tried to log, it would freeze or skip, I had a lot of "no response to OBD" errors, he showed me that he just brought the other map over to a auto and I thought it would work, but I guess something is off that much from the auto to the manual. KW saw the logs and told me I was lucky the engine didn't spill its guts, the DI was hardly being used and there was to much timing, when church would up the injector rates, it still wasn't working, no change and going lean. New plugs are going in today, and KW is sending me a revised map, I'll do some logs and see if the engine is still decent.. I'll be switching over to E85, I'll gap the plugs.005 under how they come out the box.. I assume most iridium plugs are pre gapped still??? They used to be and you couldn't stick a tool in to gap, but I haven't messed with IR plugs for years and years

[eromsdal]

i find that it is pretty easy especially if you have a set of wobbler extensions. i was looking on the internets and really couldn't find a clear answer but what was everyone torquing down the spark plugs too?

[King Tut]

Originally Posted by eromsdal

i find that it is pretty easy especially if you have a set of wobbler extensions. i was looking on the internets and really couldn't find a clear answer but what was everyone torquing down the spark plugs too?

gutentight. I find that torqueing spark plugs down to a spec is dangerous.

[Baramzisyan]

hello! fa20 +turbo+stock plugs
14.5 psi and everytime i've misfire




Then i've then bought new spark plugs, but now i've misfire again.
I need non stock plugs, but what model i need to use?

[King Tut]

I think you are past the point that a heat range change is going to fix it if you are doing that to your plugs. Looks more like a tuning issue. What gaps have you tried running?

[sosick]

Going to pull my plugs out cuz getting missfire or bogging during boost, according to full race they want you to use a 2 step colder plug which they recommend a ngk 9 cold plug, according to hks the stock plug is equvilent to a ngk 9 cold plug so im confused

http://www.brz-parts.com/50003-m45hl.html

https://www.full-race.com/articles/f...efr-turbo.html

[Amputechture]

HKS M45HLs just arrived. Waiting for the stock clutch to start slipping so that I can do both jobs at the same time.

[sosick]

Who said we dont have to lift engine? I starting to think never done this.

[Tcoat]

Originally Posted by sosick

Who said we dont have to lift engine? I starting to think never done this.

There are many threads on how to change the plugs without lifting the engine. With the right tools and girlie hands it is tricky but can be done.