Hi folks
Any advice on or if the OEM plug is okay for Subaru service to use with a tuned GTB?
coyote wrote:Sure, a GTR is fast ... but it's about as interesting as listening to grass grow.
Robbks wrote:Go to a standard NGK copper plug.
Std or V-Groove
More resistant to any knock events than platinum or iridium.
Just change at 20K regardless, but for $15 a set, who cares
coyote wrote:Sure, a GTR is fast ... but it's about as interesting as listening to grass grow.
Robbks wrote:well there's no point in asking the question if you're relying on dealership serviceing.
coyote wrote:Sure, a GTR is fast ... but it's about as interesting as listening to grass grow.
Robbks wrote:DO you have them, or do you, perform intermediate oil changes..?
Shaheenis wrote:I would use genuine Platinum plugs. Iridiums crack easily with knock, never had an issue with platinums even in the old wagon which pinged itself through two engines.
Coppers are fine if you don't mind changing them every year or less which is a pain in these vehicles. Platinums will last you 100K but I got ripped at the mechanic who charged me $40 per plug + labour. I got mine done early at 100K because of a hesitation issue which turned out to be the factory tune hesitation feature which Matt promptly fixed with a tune. You don't need different plugs for higher performance..
Shaheenis wrote:Any reputable service agent SHOULD put them in but just ask the question to make sure. Standard issue for GTB are platinum plugs which don't get replaced until 115K according to service manual.
THE SpecB wrote:Does anyone know the stock plug number and type that's in the GTB?
dr20t wrote:Here is my advice on plugs. Do with it what you will:
Platinums have long life, medium spark
Iridiums have medium life, strong spark
Copper has short life, strongest spark
Given how much of a pain it is to swap plugs, using longer life plugs makes sense where it doesn't compromise engine durability or safety.
Stock: Iridium lfr6aix gapped to 0.8mm
Mild setup 98 fuel : lfr6aix gapped to 0.8mm
E85: ILFR6B - iridium gapped to 0.8mm
Wild setup. 98 fuel - lfr7aix laser iridium one step colder gapped to 0.80mm for <25psi and 0.75 for over 25psi
E85: Lfr6a part number 6668 - copper and replace every 10,000kms and gapped same as above
but if over 30psi 0.7mm gap may be needed. Extremely important to use 6668 part number
Mick
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