• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

2004 Pontiac Grand Prix GTP

bandook said:
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.
Click to expand...
What's "copper"? Is it a brand, type, or what?

Sent from my SAMSUNG-SM-G870A using Tapatalk
 


bandook said:
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.
Click to expand...
I just want BETTER mileage!

Sent from my SAMSUNG-SM-G870A using Tapatalk
 
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!

Sent from my SAMSUNG-SM-G870A using Tapatalk
 
turbo96 said:
I found this, but I'm still wanting your stuff!
http://m.advanceautoparts.com/mt/shop.advanceautoparts.com/o/article-spark-plug-basics

Sent from my SAMSUNG-SM-G870A using Tapatalk
Click to expand...
This too:
http://allaboutautomotive.com/blog/how-often-should-i-have-my-spark-plugs-replaced/
bandook said:
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.
Click to expand...


Sent from my SAMSUNG-SM-G870A using Tapatalk
 
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:)
 


bandook said:
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:)
Click to expand...
That's what I was wanting! All in 1 email too. Tyvm!

Sent from my SAMSUNG-SM-G870A using Tapatalk
 
bandook said:
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.
Click to expand...
So I shouldn't be complaining Chris about my mpg of ~25mpg?!:D

Sent from my SAMSUNG-SM-G870A using Tapatalk
 
turbo96 said:
So I shouldn't be complaining Chris about my mpg of ~25mpg?!:D

Sent from my SAMSUNG-SM-G870A using Tapatalk
Click to expand...
I filled it up w/ 87 octane last time, but I've been advised by this forum to only use 91+ octane, correct?

Sent from my SAMSUNG-SM-G870A using Tapatalk
 
Last edited:


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.
 
Last edited:
If he's running e 85 then it's over 91+ octane.
E85 is an ethanol/gasoline blend (85/15) not an octane rating.
 
I wasn't given a manual with the car. So 91+ octane it is. TYVM!

Sent from my SAMSUNG-SM-G870A using Tapatalk
 


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?
5e942496eae57aff3fe84a06aca7adfd.jpg


Sent from my SAMSUNG-SM-G870A using Tapatalk
 
Last edited:
Probably wouldn't notice a increase, you should of saved your money n just made your own simple fwi intake.


Sent from my iPhone using Tapatalk
 
No need on the 91 octane , you can run regular 87 Octane if you want to just drive the car, and not race it. If you look at the manual for the 2004 GTP you will find that is states that you can run regular fuel in it. I owned a 2004 Grand Prix GTP and ran regular fuel in it and it ran fine. If you want performance then yeah run the higher octane. The Series III engine is very nice, I had no issues with it and the gas mileage was very good if you just wanted to drive it like a normal Car. The aftermarket air filter is very good for the engine to breath better, it helped mine a lot. I sold my car as Wife wanted a newer one so mine went down the road.
 
You must log in or register to reply here.
Back
Top