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OEM NGK vs NGK #7,8 or 9

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Old Jul 20, 2011, 07:48 AM
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OEM NGK vs NGK #7,8 or 9

Did anyone every try and notice if there's any difference between the 2? The reason I ask is because I put a set of # 7's in my Evo 8 that I used for DD right after my 60k service and the felt fine for a while then just started to feel sluggish. The power doesn't feel like it used to ontop. I kept thinking it's the clutch wearing but after 3 mts I found no difference in the way it grabbed. I don't mind going to the dealer and spending $60 on the plugs but I would prefer not if I don't have too. Lmk
Old Jul 20, 2011, 07:58 AM
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Typically for NGK’s The higher the last number the colder the plug.
Basic rule of thumb I have been told, 7’s for below 20psi and 8’s for above.
Old Jul 20, 2011, 07:58 AM
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BR7ES or BPR7ES for less than 100hp over stock over that drop a heat range to BR8ES or BPR8ES

Under $2 a plug and the only plugs I have ever used

Old Jul 20, 2011, 08:43 AM
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I'd go with some BPR8ES's and be done with it.

-Josh
Old Jul 20, 2011, 11:16 AM
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Thanks Josh. I ordered a set of BPR as recommended. Has anyone tried a motor vac service where they have to disconnect the fuel pump to run the chemicals
Old Jul 20, 2011, 05:29 PM
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Originally Posted by TopSpeed
I'd go with some BPR8ES's and be done with it.

-Josh
Stupid question, but are these marked for marine only or can we run those? Making sure there is a set for marine, and automotive.
Old Jul 20, 2011, 05:36 PM
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I ran the 7s and then switched to 8s. The 7s lasted longer but the 8s made the car run better but foul pout quicker. At least on my setup
Old Aug 24, 2011, 12:32 PM
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So i bought the BPR8ES. What should i gap them at? I have no power adders other than exhaust and intake
Old Aug 24, 2011, 12:39 PM
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I gap mine at .022. You should gap yours at .024.
Old Aug 24, 2011, 12:51 PM
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Have always gaped my plugs to .026. Never a hiccup
Old Aug 24, 2011, 12:54 PM
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I gap the BPR8ES at .022"
Old Aug 25, 2011, 05:57 PM
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Thanks fellas
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