EVO IX owners... Spark plug gap ?

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Oct 20, 2010 | 03:25 PM

#31

Anarchy99

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From: Orlando/ Kissimmee

Quote:

Originally Posted by mitsuevo803

So I pulled my plugs a few weeks ago and found the previous owner had been using BKR7EIX gapped to .026...but the plugs are 7.5mm shorter than the OEM plugs!! The car was tuned by TTP at 26psi with no knock on those shorter plugs. Then I switched to the OEM plugs gapped at .024 and I started knocking. I am looking at the LFR7AIX plugs but if I was running fine with the shorter ones, I was thinking about just buying those again even though they're shorter but as long as the car runs fine I guess that won't hurt is what I'm thinking. Any opinions?

You shouldn't use Evo 8 plugs in an Evo 9. From the sounds of it the previous owner put in Evo 8 plugs.

Oct 20, 2010 | 04:03 PM

#32

17579EVO9MR

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Okay, heres a brain buster lol. Evo 9 tuned at 35 psi on e85? I put in ngk br8eix gapped to .22 or .24, and the car dont even idle right? So I am getting my car tuned again probally this saturday. I will have stock stock plugs as well. I am going to try the stock, since they seemed to be better at idle. What gap on stock for 35 psi?

Oct 20, 2010 | 04:14 PM

#33

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e\/olution

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arnt those plugs for the 8 as well^^

Oct 20, 2010 | 04:22 PM

#34

sLUg_

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.025 with an hta green at 30psi. e85. no problems at all.

Oct 20, 2010 | 04:31 PM

#35

one4

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From: southern cali

Quote:

Originally Posted by 17579EVO9MR

Those are evo 8 plugs... thats the prob.

Mine are gapped at .022 stock turbo 24psi on 91oct

Oct 20, 2010 | 05:02 PM

#36

17579EVO9MR

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From: Strasburg, P.A.

Those are 8 plugs, oh man does that ever suck. I was recomended these plugs by some very reliable sources.

Oct 20, 2010 | 05:04 PM

#37

17579EVO9MR

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So for the 9, what would be the plug I should think of using. Should I stay with the oem, for now?

Oct 20, 2010 | 08:06 PM

#38

one4

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From: southern cali

denso plugs-

IKH24 - 1 Step Colder
IKH27 - 2 Steps Colder

ngk plugs-

R7437-8 - 1 Step Colder

with your setup i would run 1 or 2 steps colder.

Oct 21, 2010 | 10:02 AM

#39

Anarchy99

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From: Orlando/ Kissimmee

Colder plugs are a fad. For one, they are not needed on the IX as they are a longer reach plug that remove more heat from the head. Number 2, you are using ethanol fuel which is colder. You definitely don't want a cold fuel with cold plugs as that will be a recipe for misfiring.