Upgrades

[WhiteDevil]

I would rather have enthusist review then something I read on a website or catalog.

Im interested in the pros and cons of re-mapping the computer, and whats the most productive one.

Same with suspension modifications and wheel fitment, mainly width, stock diameter is fine by me.

Thanks.

2007 Grand Prix Sedan
3.8 Series III
Auto

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[EmersonHart13]

I assume this is an NA motor since you didn't mention a supercharger?

 

[TonzKnock-G]

Nothing yet available for your PCM (computer)! Throw the Comp-G suspension on it or a GMPP Kit.

 

[EmersonHart13]

Nothing yet available for your PCM (computer)! Throw the Comp-G suspension on it or a GMPP Kit.

Agreed, suspension upgrades are huge for this car... Get a GXP suspension as well. Handles great.

 

[AlmightyBirdman]

Nothing yet available for your PCM (computer)! Throw the Comp-G suspension on it or a GMPP Kit.

Someone actually experimented with an 05 ZZP 1.0 PCM and it worked fine

http://www.gpona.com/forums/viewtopic.php?t=1570&postdays=0&postorder=asc&start=0

 

[02BlueGT]

for wheels most run 245width, 18s' and 45 aspect ratio.....05 and up should be the same, if you use a 05 pcm though, you may have issues if you bring it in for warranty work.........
Comp G suspension or:

http://www.heldmotorsports.com/WBody/Coilovers.htm

+

http://www.gmpartsdirect.com/results.cfm?perfPackages=1&pkgid=121
^both the one at the top, and the trailing arms at the bottom



about 2k for full suspension

Edit, you may need some things for the GMPP kit to work, cause the Swaybars bolt to the lower control arm, but in your car they bolt to the shock

 

[Bob Kazamakis]

helds are trash.

being a brand new car i would just look at getting some ssc springs as they give you a good drop without the harsh ride.

 

[Bob Kazamakis]

i would just leave the engine alone IMO. your not going to get a ton of performance with bolt-ons from the N/A and its supposed to be your family car.

you could get a nice set of headers and a cat-back if you want some more sound and better mpg (with the headers)

 

[Dasfinc]

X2 on warranty issues.

 

[TonzKnock-G]

Compg struts with some lowering springs. GXP struts are better but far more expensive. Then front and rear STB's for cheap! Its a good start and you will be happy! Some SPO exhaust tips if you have the ugly pig nose exhaust tips. SPO grills of any color if you like that kind of look.

Now that i think about it you have a single exhaust. never mind on the spo tips.

 

[Bru]

Suspension was the best upgrade on my car without a doubt. On an NA Grand Prix, however, I would just leave well enough alone. You could throw a nice intake setup, downpipe and catback for sound, and maybe gain a little extra mpg too.

With a new PCM, you'd likely have to run premium or 91 since I think most will advance the timing and such.

 

[WhiteDevil]

Its a family car but a little bit more power and a sportier ride would do this car some justice. Im thinking around 60hp tops and a little bit more torque. Im not turning it into a sleeper.

I run mid grade BP in it, its doesnt have a huffer.

The exhaust is single but thats not always a bad thing.

 

[EmersonHart13]

DP, Ubend removal, intake, colder plugs, 180 thermo, tune if you can get it, rockers and headers if you want to go crazy. And suspension as discussed above.

 

[TonzKnock-G]

The only way to add 60hp to that thing is a power adder or N20. Maybe if you did a cam, rockers, headers, tune you might get some nice power but idk about 60hp. crank yes Whp no. Without cam or power adder your not going to get 60hp more out of it.

 

[Bob Kazamakis]

DP, Ubend removal, intake, colder plugs, 180 thermo, tune if you can get it, rockers and headers if you want to go crazy. And suspension as discussed above.

04+ dont have a u-bend.

 

[Bru]

DIY turbo kit for an easy 60 hp and stock drivability

 

[WhiteDevil]

its that hard to get a measly 60horse increase, what the hell do you guys see in these motors then?

 

[AlmightyBirdman]

its that hard to get a measly 60horse increase, what the hell do you guys see in these motors then?

Most people with N/A motors do a top swap if they want more power.

 

[Bru]

Yeah, there aren't a whole lot of N/A guys making big power. As said above, most go forced induction.

 

[TonzKnock-G]

What do u expect from a N/a V6 putting down a whooping 200 (or 220?) HP? What N/A V6 is easy to get an extra 60HP out of it without major mods?

 

[Bob Kazamakis]

the supercharged cars take much better to mods. the fastest NA times are terrible in comparison.

go trade your car in for the supercharged version, theres your 60 more hp.

 

[Bru]

^^^^ That's about the gist of it. Although an 08 Pontiac has likely depreciated 50 percent already since the car was a fleet whore, is no longer made and, well, is a Pontiac.

 

[AlmightyBirdman]

The 97-03 N/A cars can make a DECENT amount of HP with the HV3, intake, exhaust, pcm, etc. but there isn't really much available for the 04+.

 

[Fish]

You wouldnt have to run more octane with a reprogrammed PCM per say. You could leave the stock WOT timing, but up the cruise timing for more reaction and a MPG bump. Ported manifolds and a DP should do you good enough for exhaust mods. A Home Depot intake with a cone is the best you can do for the money. Air boxes cost way too much IMO for what they do. A set of ER rockers will do your top end very well and is about a 2 hour bolt on taking your time.

FWIW, I ran high 14s with my old GT and another local guy ran low 14s. He was cammed and I was running rockers.

 

[skeezer]

i wish i had money to upgrade my car