Thread: 2004 Pontiac Grand Prix GTP

Originally Posted by bandook

If you are dropping pulleys copper in a colder heat range such as AL104 or AL 103's are recommended. If not stock plugs will work fine. You CAN use copper, but you will be changing them much more often.

What's "copper"? Is it a brand, type, or what?

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Originally Posted by bandook

If you are dropping pulleys copper in a colder heat range such as AL104 or AL 103's are recommended. If not stock plugs will work fine. You CAN use copper, but you will be changing them much more often.

I just want BETTER mileage!

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I want to give a huge TY to those who have given their comments/suggestions to me on this sparkplug/wire issue I'm having. There was no shortage of those on last forum I was on though, a few more would be appreciated here though!

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I found this, but I'm still wanting your stuff!
http://m.advanceautoparts.com/mt/sho...rk-plug-basics

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Originally Posted by turbo96

I found this, but I'm still wanting your stuff!
http://m.advanceautoparts.com/mt/sho...rk-plug-basics

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This too:
http://allaboutautomotive.com/blog/h...lugs-replaced/

Originally Posted by bandook

If you are dropping pulleys copper in a colder heat range such as AL104 or AL 103's are recommended. If not stock plugs will work fine. You CAN use copper, but you will be changing them much more often.

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Copper is simply more conductive and will give the most reliable spark. The downside is it wears much faster than iridium or platinum. The copper is most advantageous when running smaller pulleys which create more boost and more turbulence in the cylinder. The spark is less likely to be blown out. If you are using stock pulley it is perfectly fine to run stock plugs. You can certainly use copper plugs just be prepared to change them every 15k miles or so.

Once you have done plugs, wires, fluid changes, etc there is not a whole lot more you can do to get better mileage. The air filter should help. Make sure your car is aligned and keep tires at proper pressure. Some even over inflate them a couple psi to get better mileage. Make sure your brake calipers are in good shape and pads aren't dragging. Bad wheel bearings can hurt mpg.

But after all that the #1 mod for better mpg is the right foot mod. Stay out of the gas, keep rpms down and drive like a grandma. Or just enjoy your car and accept the fact that you aren't driving a Prius

Originally Posted by bandook

Copper is simply more conductive and will give the most reliable spark. The downside is it wears much faster than iridium or platinum. The copper is most advantageous when running smaller pulleys which create more boost and more turbulence in the cylinder. The spark is less likely to be blown out. If you are using stock pulley it is perfectly fine to run stock plugs. You can certainly use copper plugs just be prepared to change them every 15k miles or so.

Once you have done plugs, wires, fluid changes, etc there is not a whole lot more you can do to get better mileage. The air filter should help. Make sure your car is aligned and keep tires at proper pressure. Some even over inflate them a couple psi to get better mileage. Make sure your brake calipers are in good shape and pads aren't dragging. Bad wheel bearings can hurt mpg.

But after all that the #1 mod for better mpg is the right foot mod. Stay out of the gas, keep rpms down and drive like a grandma. Or just enjoy your car and accept the fact that you aren't driving a Prius

That's what I was wanting! All in 1 email too. Tyvm!

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Originally Posted by bandook

Right now I'm getting 14mpg with a fat tune on e85 and plenty of WOT runs. If you are staying mostly stock just put stock plugs and wires in.

So I shouldn't be complaining Chris about my mpg of ~25mpg?!

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Originally Posted by turbo96

So I shouldn't be complaining Chris about my mpg of ~25mpg?!

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I filled it up w/ 87 octane last time, but I've been advised by this forum to only use 91+ octane, correct?

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I wouldn't. I'm averaging 14.5 right now lol.

Originally Posted by turbo96

I filled it up w/ 85 octane last time, but I've been advised by this forum to only use 91+ octane, correct?

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Originally Posted by bandook

I wouldn't. I'm averaging 14.5 right now lol.

You wouldn't go to 91+ octane?

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I'm running E85. Mileage is not my end goal lol. Would hope I can improve it eventually though.

Yes, use what your manual tells you to. You have a big hot air maker bolted to the top of your car. Engines don't like over heated air in the cylinders. Too hot and you get pre detonation. Too much of that and bye bye engine. 91+ octane helps combat that.

If you want to run 85 octane then talk to Overkill about a custom tune. You will lose power but it can be done. Or....buy a Prius.

I meant 85 octane petrol.

I wasn't given a manual with the car. So 91+ octane it is. TYVM!

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Just curious, if I was driving down the interstate with the CC on @ 70 or 75 mph how much better of gas mileage should I expect to get with my new air filter installed?

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Probably wouldn't notice a increase, you should of saved your money n just made your own simple fwi intake.


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