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Which spark plugs would people recommend to use on a 2005 sti type25?

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Old 26 July 2009, 07:00 PM
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scottydouk
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Default Which spark plugs would people recommend to use on a 2005 sti type25?
Which spark plugs would people recommend to use on a 2005 sti type25?
Going to be doing a service soon and change them aswell. Car has aound 350BHP at mo but going to go for more eventually.
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Old 27 July 2009, 09:44 PM
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??
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Old 27 July 2009, 09:46 PM
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ngk pfr7b
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Old 27 July 2009, 10:12 PM
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dats what i run in my classic but as its a 2.5 are they not different?
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Old 27 July 2009, 11:16 PM
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Spark plug is a spark plug, what does engine size have to do with it?
And all JDM STI (new age atleast) have NGK PFR7B's as standard

Tony
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Old 28 July 2009, 07:50 AM
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yes, PFR7Bs were what I was told when I phoned Powerstation for mine a few weeks ago. The original spec mentioned iridium, but I guess the 7Bs are cool enough.

Not had any issues with them yet.
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Old 28 July 2009, 10:26 AM
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Originally Posted by TonyBurns
Spark plug is a spark plug, what does engine size have to do with it?
And all JDM STI (new age atleast) have NGK PFR7B's as standard

Tony
Does the T25 get 2.5 heads added? If so then it needs the long reach plugs (ILFR7H).
If the T25 just has a 2.5 bottom but 2.0 heads then the PFR7Bs.

Nick
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Old 28 July 2009, 09:17 PM
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2.5 heads run a long reach plug NGK LFR7AIX plugs Not PFR7B
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Old 28 July 2009, 10:40 PM
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Originally Posted by Butty
Does the T25 get 2.5 heads added? If so then it needs the long reach plugs (ILFR7H).
If the T25 just has a 2.5 bottom but 2.0 heads then the PFR7Bs.

Nick
correct i need IFR7H! or do i upgrade to 8'S
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Old 29 July 2009, 07:54 AM
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Originally Posted by stanmo
yes, PFR7Bs were what I was told when I phoned Powerstation for mine a few weeks ago. The original spec mentioned iridium, but I guess the 7Bs are cool enough.

Not had any issues with them yet.
Originally Posted by scottydouk
correct i need IFR7H! or do i upgrade to 8'S
I'm a little confused
If PS have told Stanmo that PFR7Bs are needed then the T25 has 2 litre heads.
Scotty - have you found out something to the contrary?

7 grade plugs would be fine at your power output.

Nick
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Old 29 July 2009, 09:32 AM
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Not sure about the mk2 cosworth engined T25 but the mk1 was definately 2ltr twin scroll heads

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Old 29 July 2009, 07:57 PM
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will find out once take plugs out to see what is in it soon, its a t25 litchfield is makes any difference?
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Old 29 July 2009, 11:43 PM
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Mk1 T25 is Jap spec 2.0 cylinder head.

The car is running, and they were definitely PFR7Bs fitted, as I was watching.

Has the car had the Cosworth MY06 engine build ? No idea what plugs if that is the case.
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