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Board index » 1997-2008 Grand Prix Discussion » Supercharged 3800 L67/L32

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Seed65
 Post subject: Spark Plug
PostPosted: Wed Sep 01, 2010 3:27 pm 
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Good day,

I will be changing my plugs from stock to Autolite 104s (and new stock wires), once I install the 3" catted DP and 180 deg tstat. I have been reading the people have used .54 gap for these plugs. Is this the recommendation for a lightly modded GTP Comp G?

Thanks.

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AjL227
 Post subject: Re: Spark Plug
PostPosted: Fri Sep 03, 2010 2:33 pm 
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Until you drop to at least a 3.6" pulley, I advise you stick with OEM stock heat range plugs. You will just be replacing your plugs at shorter intervals since cold plugs foul out sooner. Use a DMM and measure the resistance of your plug wires, chances are they are still good and replacements are unnecessary.

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z3r0
 Post subject: Re: Spark Plug
PostPosted: Fri Sep 03, 2010 2:45 pm 
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605's would be good in knocking down some kr since it is only 1 heat range from stock

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Seed65
 Post subject: Re: Spark Plug
PostPosted: Fri Sep 03, 2010 3:26 pm 
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Hey there!

I ended up using the Autolite Xp 104s - Iridiums. I figured that the copper 104s would need replacing every 10K or so....and they are a pain to change! :)

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bud659
 Post subject: Re: Spark Plug
PostPosted: Mon Sep 06, 2010 6:20 am 
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Seed65 wrote:
I ended up using the Autolite Xp 104s - Iridiums.


Curious to why not AC-Delco Iridiums. I am trying to locate the part# for the next range down
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Seed65
 Post subject: Re: Spark Plug
PostPosted: Mon Sep 06, 2010 11:57 am 
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Good day,

I chose the Autolites since many people on this forum use Autolites. I chose the Iridiums since they last a lot longer than the copper 104s.

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thelongone13
 Post subject: Re: Spark Plug
PostPosted: Mon Sep 06, 2010 3:03 pm 
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^^^ Problem, if you're running boost, the Iridium plugs stay hot for longer after firing. This can cause detonation, which essentially is KR. My AL104s last me about 2 years on average. Haven't had them die early.

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Seed65
 Post subject: Re: Spark Plug
PostPosted: Mon Sep 06, 2010 5:45 pm 
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Hmmm...dang.

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