Thread: Upgrades for my 2003 Grand Prix

I have a 2003 grand prix SE with the 3.1L and I am in the process of adding some engine mods. I am adding a k n custom cold air intake, I am replacing the spark plugs, upgrading my wires to Taylor street thunder 8mm and I also purchased a throttle body from a 3400 series motor. this will give me another 4mm of intake as far as the throttle body goes. I am hoping this will help with the addition of the intake. Anyone see any problems with the upgrades or anything I could encounter pre/post installation????

Originally Posted by TLSheff

K&N intake kit is expensive and worth way less than its priced for.

Taylor wires are good. Money well spent

Throttlebody upgrade is nice, but its not really going to get you much more power, the motor won't be sucking in anymore air than it would with the factory throttlebody. Its a good supporting mod, but you won't see anything right now.

Truthfully there isn't much in the way of mods for the 3.1. Its not a big market. You'd be best doing research to see if a turbo kit off the older 3.1s would be able to work with your motor, if so that may be a good project for this car. Boost is always fun. But a big turbo kit would likely be too much for that motor.

One thing I do know if they are known for leaks at the intake manifold, just like our 3.8s. Make sure you look into that, could cause major problems if not addressed.

And btw

I actually bought a k n cone filter and I am going to build my own intake which will save me tons on money..

After reading enough threads I do get the idea I wont see any huge gains but in the end I am not looking for 75 horses plus on gains because that will probably get me in trouble lol

Should everything from my stock throttle body switch over nicely to the 3400 upgrade?

Originally Posted by EJOUIE

MMS 3100/3400/3500 Grand Am/N-body Turbo Kit - Milzy Motorsports

That may work with a little fab. Just make sure to check the 4t65 box.

What should I do checking the 4t65 box? and what do you mean by fab??

Originally Posted by EJOUIE

I mean that the kit is for the 3100, and you can option it for the 4t65 transmission. Which is the same combo found in your car. The catch is that it was designed for a grand am so there may be some small fitment issues, hence the possible fabrication.

I say go for it because then you can have a powerful grand prix and have it sound nice.











...powerful grand prix and sound nice....

rolls off the tongue kinda funny.

Alright Thanks for the input!

Sorry bud best bet would be to buy a GTP motor harness and computer and put it in you would notice more gains that way my dads Lumina has a 3100 in it and I dread driving it everytime. I lost to a ford escort on the street lol.

Grand Prix se <3

Originally Posted by blueguy91

Dispite the music...

v6z24.com seems to have tons of info on the turbo 3100/3400...might look there if you want to boost it.

See: Turbo 3400 swap z24 - YouTube

and...

V6Z24.com :: View topic - turbo 3100 dyno :: 320hp/320tq at 11 psi

Granted, that's the gen previous to yours...but most of everything should still be somewhat the same.

Alright thanks a lot man

Originally Posted by blueguy91

Dispite the music...

v6z24.com seems to have tons of info on the turbo 3100/3400...might look there if you want to boost it.

See: Turbo 3400 swap z24 - YouTube

and...

V6Z24.com :: View topic - turbo 3100 dyno :: 320hp/320tq at 11 psi

Granted, that's the gen previous to yours...but most of everything should still be somewhat the same.

The problem with that is if you look at the weight differnce between the vehicles it.makes more sense to just do a whole engine. All that work and money will get you further with a 3.8.

Update on the ride. I put in a 56mm throttle body, new taylor wires and performance iridium plugs and my own custom pieced CAI. From 4000 rpm on it sounds like a 454! she roars when i hit the pedal hard. I also have noticed much better gas milage, AND I gained just under 2 seconds for my 0 to 60 and 1/4 mile time. Incredible considering what I did really wasn't anything huge. More than satisfied and proved everyone wrong who didnt think it would do anything. Pretty sweet

Will do when I get the chance! Does anyone know what a larger Plenum would yield ontop of the intake I have put in... Plus I will be customizing an exhaust system too. Gotta get everything all straightend out.

Does anyone know the bolt to bolt diameter on my exhaust manifold that connects with the downpipe???