Thread: Original Tires/Spark Plugs

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  1. #1 Original Tires/Spark Plugs 
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    Anyone know what the orginal tires and spark plugs were for an '04 Pontiac Grand Prix GT 3800 Series 3?
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  2. #2 Re: Original Tires/Spark Plugs 
    GT Level Member starscream5000's Avatar
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    Spark plugs are iridium (read, expensive and a waste of money). The original wires are probably along the lines of AC Delco.

    You do not want to put original type spark plugs in the car anyway, the cars are prone to KR in stock form as it is. Do yourself a favor and get one step colder on the plugs.
    2005 GTP - AL 605's gapped at .055", SD headers, WAI with 9" cone air filter, 180 degree t-stat, green coolant, otherwise stock.
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  3. #3 Re: Original Tires/Spark Plugs 
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    Ok. So what should I go with for spark plugs? And should the gap stay at .060" with a different plug? Just curious about the tires.
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  4. #4 Re: Original Tires/Spark Plugs 
    The Blue One blueguy's Avatar
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    Tires should be whatever you feel comfortable running...but most of the time the factory tire size is 225/60/R16.

    As for plugs...old motor technology...use old spark plugs. Autolite 606's gapped @ .055".

    Done. For wires...get Duralast Lifetime warranty ones from AutoZone,
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
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  5. #5 Re: Original Tires/Spark Plugs 
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    AL 606's are one step colder, correct? I've got AL 104's and I know those are 2 steps colder.
    2005 GTP - AL 605's gapped at .055", SD headers, WAI with 9" cone air filter, 180 degree t-stat, green coolant, otherwise stock.
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  6. #6 Re: Original Tires/Spark Plugs 
    The Blue One blueguy's Avatar
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    No, AL606's are stock equivalent...605's are just a tad cooler.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
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  7. #7 Re: Original Tires/Spark Plugs 
    Poppin 'em thangs mechguy's Avatar
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    Is the OP aware the copper plugs have to be changed 8X as often as iridium plugs?
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  8. #8 Re: Original Tires/Spark Plugs 
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    Good information, thanks. I was thinking the same thing. Having to change them more often, as hard as the back ones are to get to, doesn't look fun. But I will take your advice and go with the Autolites. So, the concensus is AL 606 @ .055"?
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  9. #9 Re: Original Tires/Spark Plugs 
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    Quote Originally Posted by quickster View Post
    Good information, thanks. I was thinking the same thing. Having to change them more often, as hard as the back ones are to get to, doesn't look fun. But I will take your advice and go with the Autolites. So, the concensus is AL 606 @ .055"?
    Yes stick with the stock heat range you don't need colder plugs on a NA car.
    Durkz 04 Silver GT2
    DHP'd, Comp G'd, looking for more speed
    http://www.grandprixforums.net/zzps-new-website-2-53834.html#post678234


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  10. #10 Re: Original Tires/Spark Plugs 
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    The only plugs autozone and O'Reillys list are the irridium plugs. I googled and found there are different plugs, traditional, flat pack, copper-core. What should I ask for?
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  11. #11 Re: Original Tires/Spark Plugs 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    just walk up the counter and ask for autolite plugs. I dont think they list them on the internet on there website.

    SMGPFC Member #1
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  12. #12 Re: Original Tires/Spark Plugs 
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    Yeah, don't tell them what it's for, just say you need 6 autolite 606 copper plugs.
    2005 GTP - AL 605's gapped at .055", SD headers, WAI with 9" cone air filter, 180 degree t-stat, green coolant, otherwise stock.
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  13. #13 Re: Original Tires/Spark Plugs 
    GTX Level Member cerick08GP's Avatar
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    Quote Originally Posted by starscream5000 View Post
    Yeah, don't tell them what it's for, just say you need 6 autolite 606 copper plugs.
    That is exactly what I did at Advanced Auto.

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  14. #14 Re: Original Tires/Spark Plugs 
    SE Level Member ls1freek's Avatar
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    Ok, so I have an 05 GTP, 80k miles, probably a good idea to change them by now... What do you guys recommend I put in there? I'm new to the whole boost stuff... I've got lots of experience in N/A... Are the NGK TR55's cooler then my stockers? Or should I go TR6's? Or should I stay away from NGK's with boost? I'm running NGK TR55's in my Vette N/A.
    2005 Grand Prix GTP w/CompG
    - Stock
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  15. #15 Re: Original Tires/Spark Plugs 
    GTP Level Member 01gpgt01's Avatar
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    I ran tr6's in mine, I liked the plug. I got Less misfires at idle then with the autolight 103s, but alittle bit more KR. If your stock NGK TR55: 1 Heat Range Cooler. TR6=2 colder. Not sure of the stock heat range NGK plug, But there fine to run on boosted car Ls1freek
    2001 GT. A few here and there mods http://www.streetfire.net/video/2001...ynp_208097.htm

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  16. #16 Re: Original Tires/Spark Plugs 
    SE Level Member ls1freek's Avatar
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    Quote Originally Posted by 01gpgt01 View Post
    I ran tr6's in mine, I liked the plug. I got Less misfires at idle then with the autolight 103s, but alittle bit more KR. If your stock NGK TR55: 1 Heat Range Cooler. TR6=2 colder. Not sure of the stock heat range NGK plug, But there fine to run on boosted car Ls1freek
    Thanks man... Hmm, mabe I should be running a hotter plug in my Vette lol

    Oh BTW, how many miles will the TR's normally go?
    2005 Grand Prix GTP w/CompG
    - Stock
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  17. #17 Re: Original Tires/Spark Plugs 
    GTP Level Member 01gpgt01's Avatar
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    50K miles+. There Iriduim
    2001 GT. A few here and there mods http://www.streetfire.net/video/2001...ynp_208097.htm

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  18. #18 Re: Original Tires/Spark Plugs 
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    "TR6" is copper.

    "TR6IX" is iridium.

    "TR6GP" is platinum.

    see the trend yet?

    In the TR55, the first five is the heat range, the second one indicates its pre-gapped to .059".

    Never trust this as plugs ARE dropped between the manufacturer and your local store.

    NGK claims the 5 heat range is stock for our cars.
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  19. #19 Re: Original Tires/Spark Plugs 
    SE Level Member ls1freek's Avatar
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    Hmmm.....
    2005 Grand Prix GTP w/CompG
    - Stock
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  20. #20 Re: Original Tires/Spark Plugs 
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    T means its a 14 MM reach and the R means it has a resistor.
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