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 Post subject: SF5 spark plugs
PostPosted: Tue Jan 31, 2017 7:25 pm 
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Vehicle: JDM SF STi Pure White

Posts: 148
Location: Germany
Hi guys,

due to some interesting stuttering issues i am planning to replace the spark plugs on my SF5 STi.

I hit up partsouq to find the proper replacement plugs, but it returns two types.
The original part is 22401AA400 aka NGK PFR6B (http://www.sparkplug-crossreference.com ... 22401AA400)
The substitution mentioned on partsouq is 22401AA360 aka NGK PFR7B (http://www.sparkplug-crossreference.com ... 22401AA360)

Sadly i'm not too fond with the differences of plugs.
Which ones should i get?


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 Post subject: Re: SF5 spark plugs
PostPosted: Wed Feb 01, 2017 2:43 pm 
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Vehicle: BNR32GTR GDWRX SF5GT

Posts: 16784
Location: south geraldton
i found that running over 17psi of boost that the 7's were better and got rid of the spluttering issues i was having

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 Post subject: Re: SF5 spark plugs
PostPosted: Wed Feb 01, 2017 6:59 pm 
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Vehicle: JDM SF STi Pure White

Posts: 148
Location: Germany
Well, my Foz runs on 10psi, which i think is stock boost.

I'll get the 7's then, thank you.


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 Post subject: Re: SF5 spark plugs
PostPosted: Thu Feb 02, 2017 9:32 am 
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I Say: Who Needs Boost Anyway??
Vehicle: MY10 2.0D Premium

Posts: 8073
Location: Hobart, Tas
forget anything fancy.

just buy the standard $4 copper ones
NGK BKR6E. gaps will be factory set at 0.8mm

Boost and detonation kills fancy plugs
new plugs every 20k km is cheaper than killing a $100 set of plugs after 30k

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russgt wrote:
This has never been done before. Glad you didnt search for other threads on the subject.

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 Post subject: Re: SF5 spark plugs
PostPosted: Fri Feb 03, 2017 3:09 pm 
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I Say: You tell me Picasso - are you a s*** painter , or do just paint ugly f***** people .
Vehicle: MY04 XT

Posts: 1927
Location: Brisbane
I've never had a prob with the oem plugs - now running 19psi ....
change plugs every 20 thou - no thanks .


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 Post subject: Re: SF5 spark plugs
PostPosted: Fri Feb 03, 2017 6:46 pm 
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Vehicle: JDM SF STi Pure White

Posts: 148
Location: Germany
I've changed plugs on my old MY06 2.0R once. Took me and a buddy an hour to do.
The SF has a tad more room to work with and no fancy accessories like a secondary air pump, so i think it will be a bit easier to do.

Still i wouldn't want to change them every 20k.


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 Post subject: Re: SF5 spark plugs
PostPosted: Tue Feb 21, 2017 9:07 pm 
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Vehicle: JDM SF STi Pure White

Posts: 148
Location: Germany
Did the plug replacement yesterday. PITA job to do on a boxer engine, but i still managed it.

Judging from the first long drive of 50kms today, it's running waaay better than before.
The old plugs were just old, no signs of any other issues like oil in the chamber or bad AFR.


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 Post subject: Re: SF5 spark plugs
PostPosted: Wed Feb 22, 2017 12:12 pm 
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I Say: Who Needs Boost Anyway??
Vehicle: MY10 2.0D Premium

Posts: 8073
Location: Hobart, Tas
plugs are p!ss easy especiall in an SF

remove washer bottle
pull off the plug leads
using 1/4" or 3/8"dr tube socket with "wobble" extension of the correct short length
never taken me more than 20 minutes to do a 4 banger Subaru or 35 mins for the H6 with COP coilpacks

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russgt wrote:
This has never been done before. Glad you didnt search for other threads on the subject.

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 Post subject: Re: SF5 spark plugs
PostPosted: Wed Feb 22, 2017 7:58 pm 
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Vehicle: JDM SF STi Pure White

Posts: 148
Location: Germany
Well, how often do you swap plugs then? :D
It was my second time doing it, both on a boxer.
First time was on my Impreza, did it with a buddy, took us an hour.

This time it took me about two hours, though i did slack around a fair bit as the engine was a tad hot after a 50km motorway and city traffic drive. Plus it was highly fascinating to watch the owner of the shop who let me work on my foz while he was hand porting intakes on a head. I think, it would've taken me 45min to an hour if the engine wasn't hot and i completely stuck to it with no interruptions.
The biggest issue was that there was not really much space. The tools i had fitted in there just so.

On a related note: One of my two issues is now gone. It's not stuttering at partial load any more. I even deliberately tried to reproduce it and it just ran like a charm.
But it still has this every-now-and-then-stutter when in idle.
And i'm not sure what causes it. I asked the owner of the shop and he said it might be something with the coils, the injectors or the wiring related to them.


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 Post subject: Re: SF5 spark plugs
PostPosted: Thu Feb 23, 2017 12:57 am 
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I Say: Car mods are like OddBodz, you got to collect them all! -------------------------------------
Vehicle: MY05 STi swapped sled

Posts: 17723
Location: Spearwood Perth WA
I did the plugs on my car while it was strapped to a dyno and burning red hot after a couple of hours of dyno tuning. Took about 15 mins to do all 4 out and back in.

Worst part was the burns to my arms. A week later and the burnt skin is nearly all peeled off...

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