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Old 06-25-2007, 12:17 AM   #1
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hey yall, my plugs are starting to go, so i figured id put on a 3.5" pulley and fwi at the same time and get colder plugs. but im confused. on NGK'* website and at advance auto parts, they both said the stock plug for my car was a tr55. in the spark plug thread, it says the tr55 is one heatrange colder.
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Old 06-25-2007, 07:56 AM   #2
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I don't know if it'* any help but I went with Autolite 104'*. They're two heat ranges colder than stock and Intense recommends them for 6 to 12 lbs of boost. With my MPS and FWI I can peg the boost gauge at WOT.

If you have stock wires, make sure you have access to a new set. I was careful and broke the boot off 2. Number 6 is a PITA!
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Old 06-25-2007, 02:25 PM   #3
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im gonna put on some belden wires from napa at the same time. they cant be harder than my eltee juan was, i did only half and paid somebody else to do the other side, i couldnt even get to those. if the tr55'* are the stock ones, ill probly go with one heatrange cooler, the tr6. im just wanting to confirm that the tr55s are stock first, because that conflicts with the spark plug data on here.
edit:and im also going to try and find a spark plug boot puller, i tried yankin one of the back ones off, it didnt budge.
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Old 06-25-2007, 04:45 PM   #4
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I couldn't find a boot puller that would work in the tight area behind the engine. They are a PITA to get off, especially if original. When I finally got my set off the first time, there was this yellowish brown sticky stuff all over it, almost like a glue that was holding them on. Lots of twisting, turning, pulling, in conjunction with a few well chosen words, got 'em off.
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Old 06-25-2007, 07:24 PM   #5
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Rogue recommends removing the rear engine hoist bracket. I didn't and it was a witch! The next time I'm gonna try and remove the two bolts and take the bracket off.


If you remove the bracket, lemme know how bad number 6 is.
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Old 06-26-2007, 01:56 AM   #6
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Quote:
Originally Posted by Archon
few well chosen words, got 'em off.
alright! i can practice my imitation of the bartender off of Boondock Saints?! sweet. thanks for the advice, fellas.
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Old 06-26-2007, 07:19 AM   #7
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Quote:
Originally Posted by 95seand78z28
Rogue recommends removing the rear engine hoist bracket.
That'* what I did and couldn't have gotten the back plugs out without doing so. On mine there was an electrical coupling attached to the bracket that had to be unattached first.
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Old 06-26-2007, 08:46 AM   #8
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Quote:
Originally Posted by 95seand78z28
I don't know if it'* any help but I went with Autolite 104'*. They're two heat ranges colder than stock and Intense recommends them for 6 to 12 lbs of boost. With my MPS and FWI I can peg the boost gauge at WOT.

If you have stock wires, make sure you have access to a new set. I was careful and broke the boot off 2. Number 6 is a PITA!
Too cold for a 3.4 or 3.5, Karl. Those are going to foul on you. You want ONE colder, not two. Too cold is just as bad as too hot.
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Old 06-26-2007, 08:51 AM   #9
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Quote:
Originally Posted by willwren
Too cold for a 3.4 or 3.5, Karl. Those are going to foul on you. You want ONE colder, not two. Too cold is just as bad as too hot.
Bill, I'm seeing 9 to 10 lbs boost at WOT. Why does Intense list the 104 like this?

Quote:
Use Autolite® 104 spark plugs (two heat ranges colder than stock) if you have a 3800 Series II or III engine with 6 to 12 pounds of boost. At this level, we recommend reducing the spark plug gap to .050", or .035" with nitrous oxide.
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Old 06-26-2007, 08:58 AM   #10
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Karl, that'* just a general range. 95% of the people running 3.4'* run one heatrange colder than stock to the best of my knowledge. And I know from personal experience what too cold does to plugs. They foul out quickly.

I run one heatrange colder than stock at over 10psi with 2.5'* on both of my cars.
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