Forged 2.5 Spark Plugs
03 October 2021 | 08:26 AM
#1
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Joined: Jun 2012
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From: Aldershot
Forged 2.5 Spark Plugs
Hi all,
Fully forged 2007 STi with 98k on the clock.
Looking at my service history, my current plugs have done 38k miles.
I can't tell from the invoice exactly what was fitted - only NGK Iridium long reach.
Can anyone suggest the actual best plug? It's mapped to 342 with 410ft lb's if that's any help.
It seems a minefield of colder, hotter plugs etc. Heat range 6 or 7?
Some seem pre-gapped, others don't.
It's mapped to V-Power.
Fully forged 2007 STi with 98k on the clock.
Looking at my service history, my current plugs have done 38k miles.
I can't tell from the invoice exactly what was fitted - only NGK Iridium long reach.
Can anyone suggest the actual best plug? It's mapped to 342 with 410ft lb's if that's any help.
It seems a minefield of colder, hotter plugs etc. Heat range 6 or 7?
Some seem pre-gapped, others don't.
It's mapped to V-Power.
Last edited by Hawkeye D; 03 October 2021 at 09:38 AM.
03 October 2021 | 10:15 AM
#4
Scooby Regular
Joined: Feb 2003
Posts: 7,640
Likes: 772
From: Harpenden
OEM: NGK: ILFR6B
As mentioned above NGK: ILFR7H (gap 0.7/0.8mm) although iridium plugs should be good for a fair few more miles (subaru service item every 6years/60K miles)
As mentioned above NGK: ILFR7H (gap 0.7/0.8mm) although iridium plugs should be good for a fair few more miles (subaru service item every 6years/60K miles)
Last edited by Don Clark; 03 October 2021 at 10:38 AM.
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