Speedy's Ride.......2005 Pontiac Grand Prix GTP Comp G

[speedy_2]

Well I'm not on here much, but I think the last time I was regularly on here I had a '98 Seville STS. Which has been gone for like 4 years. After that I had a '98 Z28, but didn't keep it long once I met my wife. Sold that, shared her car for awhile. This past April, we've bought a car that's worth sharing lol. I'll also get to mod it a little, which should turn it into a pretty peppy family sedan. lol Since these pics I've had it tinted and I have a Cold Air Intake sitting in the garage that I'll be installed soon.


2005 Pontiac Grand Prix GTP Comp G

48K Miles
Sunroof
HUD
But, cloth interior. Actually perfect since it is going to be a family car.
100% Stock.

Plans:

3.4 pulley
Tune
Headers
CAI

Bought a buffer. Pic after the buff job..

 

[socomplayer2]

Looks clean man!

Look forward to the updates on the modifications .

 

[CDailey]

I remember your STS. Too bad it's gone. The GTP is a nice car. Pretty quick too from what I've read. The color is great too. 👍

 

[YSSMAN]

All things considered, they are pretty quick cars given their age and relative barbarism in comparison to the current crop of Epsilon II cars. I thought the GTP/CG was an interesting car, but it's a shame it never really compared to the concept cars Pontiac kept rolling out at the time. I'd swap the wheels out if I were you, probably going for something similar to what they had on the G-Force concept:

 

[Omnis]

I clicked this thread expecting some kind of mech.

 

[Space Dynamics]

Nice dude, have you taken it to the 1/4 mile strip yet? I have a 97 GTP that got a 14.6 with a intake. Your car is exactly where I want mine.

 

[speedy_2]

All things considered, they are pretty quick cars given their age and relative barbarism in comparison to the current crop of Epsilon II cars. I thought the GTP/CG was an interesting car, but it's a shame it never really compared to the concept cars Pontiac kept rolling out at the time. I'd swap the wheels out if I were you, probably going for something similar to what they had on the G-Force concept:

I agree. I mean, yeah, no DOHC...no variable valve timing...etc. But who cares. I can work on it myself. Parts are cheap. It looks great. Rides great. Modifying is easy and cheap as well. And, since it's in such great condition and low miles, I see myself getting a lot of life out of it.

By the way, a set of stainless steel headers and piping all the way to the cat is only $205 shipped. A Tuned PCM another $200 or so. The smaller pulley I'm getting for $20 used. All the other things are small...cooler plugs, wires, fluid changes, etc. Cars modded like I have planned are seeing ~13.9 in the 1/4 mile.

 

[Eric.]

That trans won't last long if you beat on it.

 

[Jim Prower]

What was the "comp G," anyway?

 

[speedy_2]

What was the "comp G," anyway?

http://www.clubgp.com/newforum/tm.asp?m=3409269&p=1&tmode=1&smode=1

 

[Rotary Junkie]

Modded 3800SCs certainly are quick...

I prefer the 97-03 body in a coupe (interior as well), but even so, very nice car. Good to see it's got a leather wrapped wheel too, GM's "base" wheel is just bleh.

 

[Space Dynamics]

Cars modded like I have planned are seeing ~13.9 in the 1/4 mile.

Theres a guy on the Grand Prix forum running 13.6 with headers, intake, tune plugs, Tstat and fat tires on the front. I think you should expect better then 13.9 with that 3.4 you got on there.

 

[Adamgp]

Nice car. I got a '97 GTP myself.

As stated above be careful of the trans. I've heard they were maxed out from the factory.

 

[JCE]

That trans won't last long if you beat on it.

Neither will the headgasket. 👍

 

[Space Dynamics]

Now who told you that JCE? I've never heard of those going out on these.

 

[Nicksfix]

Nice ride 👍

I know a few people that have these Pontiac's and they all swear good by them.

Good luck with yours.

 

[speedy_2]

Yeah 3800's just eat head gaskets. lol. Ok...

Anyway. . . . Installed a CAI the other day.

Videos

http://www.youtube.com/watch?v=iTbluDIEiyo&hd=1

http://www.youtube.com/watch?v=Pla985Dqg8g&hd=1

 

[Rotary Junkie]

Neither will the headgasket. 👍

Intake gasket is the problem, not the headgasket.

And IIRC it's not a problem on the 3800SC. L67BBQ is though.

 

[xXSilencerXx]

Nice car man! Those 3800 can be made fast. Seen 500 HP buicks with that motor and blower.

 

[speedy_2]

Another short vid. 50-125mph. Definitely NOT a beast on top end lol.

http://www.youtube.com/watch?v=VEvzZ9o5e9M&hd=1

 

[Adamgp]

Definately not. They are poor performers on the top end unless you have a nice cam or swap the supercharger for a turbo setup.

Mine pulls like crazy until about ~70-80mph, then it falls flat. Still pulls, just not strong.

 

[speedy_2]

Yeah. Hopefully a pulley swap in the near future, but not really worried about going over 100 that often anyway.

 

[Adamgp]

Mine has a pretty average 3.4" pulley setup. TOG headers, Borla exhaust, Wizair intake, SLP 1.8 roller rockers.

Even with that it still doesn't like to go over 70-80mph. Not that I do that regularly.

Rockers do help a bit, cheaper and easier than a cam if money is an object.

 

[speedy_2]

Cool. I'm thinking about a 3.4" setup. Nothing insane, but I want to make sure I don't have any KR. Headers, rockers, tune, and maybe an intercooler.

 

[Keef]

Part of the reason is the supercharger, part because the stock flow parts are like breathing through straws as seems typical of older GM engines, and part because the automatic is geared for intergalactic travel. So, besides having an engine that doesn't breath well at high rpm, you're also stuck there forever because 3rd gear spans a whole 45 miles per hour, which is stupendous.

I'd suspect the basic intake/header/exhaust combo would shop a serious chunk off that same acceleration run, but it's still going to take forever with the stock 4-speed's gearing. Get a final drive that's about triple the stock one and maybe 4th gear will actually matter. Actually, that might be the most effective thing of all! Do some math and get a drive that cuts 3rd gear's top end from 125 to...100 or so. That's still taller than most manual transmissions. Highway economy in 4th shouldn't suffer too awful much because you'll still be cruising at about 800rpm instead of 350 and kick-downs to pass would be less common because of the increased torque. That would make it much more drivable I think.

 

[Adamgp]

Cool. I'm thinking about a 3.4" setup. Nothing insane, but I want to make sure I don't have any KR. Headers, rockers, tune, and maybe an intercooler.

I forgot to add I got a DHP PCM also.

As far as the gearing, you should be good with the Comp G, which I believe came with a 3:29 final. My '97 only has a 2:93 gear in it.

I never felt the need for a gear swap. The engine produces enough torque that I can pass cars and go up hills without having to downshift.

If I do need more power, I just tap the performance shift button and punch the accelerator and I get a 3-1 downshift. Which is alot of fun until the day my trans goes kablooey.

 

[speedy_2]

Cool. I do have the 3:29 final gear. I would love for the trans to skip a gear when down shifting. So annoying for it to go to 2nd for a split-second and then to 3rd.

 

[Adamgp]

You would need a PCM upgrade to do that. Either a DHP or Intense. Or tune the stock pcm if you know how. I didn't want to mess with it and got the DHP.

In addition to the 3-1 downshift, it boosts line pressure so shifts are faster and firmer.

Not sure if newer gp's had a performance shift button or not, but mine turns off the DHP functions when I don't want them.