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spark plugs for 06 sti
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Old 02 Feb 2010, 03:27 PM   #1 (permalink)
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Question spark plugs for 06 sti

Hi Guys,

I've been given some conflicting advice re spark plugs.

I'm looking for the best plugs for my 06 sti (2.5 litre)
Car has ppp & decat, k&n.

Subaru garage tells me oem plugs are NGK ILFR6B and that no upgrade spec plug is available.
Tuning company1 tells me same thing.
Tuning company2 tells me ILFR7H is the one step colder plug and would suit the mods on my car better. This is backed up by some forums online but not others from what i have read.

Anyone got some tried and tested advice on this?

I had actually already ordered ILFR6B online but asked seller to hold the order incase they are the wrong ones.


Thanks,
David
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Old 02 Feb 2010, 11:19 PM   #2 (permalink)
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Re: spark plugs for 06 sti

Spark plu gap? worth a look
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Old 03 Feb 2010, 08:13 AM   #3 (permalink)
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Re: spark plugs for 06 sti

Looks like that's for older impreza models.

I got a reply back from NGK - quite informative actually....

--------------------
We cannot offer any recommendations for spark plugs as your vehicle has
been modified, however ILFR7H is dimensionally the same as your standard
ILFR6B. If you have been told to use just one heat range colder, then
ILFR7H should be a suitable suggestion, however it does have a smaller
electrode gap setting of 0.6mm compared to 0.8mm of the standard ILFR6B.
Some tuning companies who specialise in forced induction
(Turbo/Supercharging) tuning do suggest dropping the standard gap setting
when raising boost levels to help the ignition system cope with the
increased pressure levels.

Moving to a colder heat range plug may be required when modifying engines
to produce more power as the spark plug would need to transfer the heat
produced by the combustion process faster to keep the firing nose of the
plug from overheating.

If your local tuning company has experience with cars using similar
modifications then may be able to suggest a different part number for you
to try.

Please feel free to call me on the below number if you would like to
discuss further the effects on spark plug heat range when tuning engines.
---------------------

The ILFR7H plugs look promising, so I guess the question now is will a 0.6mm gap be suitable?
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Old 03 Feb 2010, 03:41 PM   #4 (permalink)
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Re: spark plugs for 06 sti

You could get the 7`s and gap them to suit urs
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Old 03 Feb 2010, 05:22 PM   #5 (permalink)
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Re: spark plugs for 06 sti

Thanks for the reply bob.
I've been asking around and local tuners have told me they used the 7's without changing the gap - I'm going to try them at 0.6mm gap and see how it runs.

David
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Old 09 Feb 2010, 06:40 PM   #6 (permalink)
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Re: spark plugs for 06 sti

So I ordered up the NGK ILFR7H, but when I received the packet today it says PTR4B-15 stockcode 5146

Are these the same plugs ?
i tried looking up application info but cant find anything
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Old 09 Feb 2010, 08:44 PM   #7 (permalink)
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Re: spark plugs for 06 sti

NGK SPARK PLUGS / NGK PLATINUM SPARKPLUGS - PTR4B-15 - 5146 :: 10.45 :: NGK Spark Plugs & Denso Sparkplugs :: NGK SPARK PLUGS - PTR ::
NGK SPARK PLUGS / NGK IRIDIUM SPARK PLUGS - NGK Iridium Plugs - ILFR7H Mitsubishi LANCER EVO 9 CT9A :: 55.12 :: Mitsubishi Lancer EVO 1(I) 2(II) 3(III) 4(IV) 5(V) 6(VI) 7(VII) 8(VIII) Parts, Tuning, Spares & Accessories :: EVO 7 8 9 CT9A - Engine &
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Old 10 Feb 2010, 08:16 AM   #8 (permalink)
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Re: spark plugs for 06 sti

thanks.
completely different plugs - I contacted the seller and they are posting out replacements.

good job i'm not urgently needing them!
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