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Pontiac Grand Prix Performance Modifications

34 messages,  Last post on Sep 20, 2011 at 5:56 AM

You are in the Pontiac Grand Prix Forum.

What is this discussion about? Pontiac Grand Prix, Performance Mods, Sedan

Messages Page 2 of 4

#5 of 34 Additive and Pads by rmozol

May 15, 2006 (11:03 am)

As far as the additive, it's kind of a wash for price. Unless you can get it VERY cheaply, it costs more actually. Figure $6 for a bottle, and 17 gallons, and that works out to an extra 35 cents a gallon. Around here, premium doesn't have the 10 cent jump like regular to mid-grade. It's only about 13 to 15 cents a gallon more than regular. I found pads I'm getting too. EBC makes a "red" series for our cars. They bill them for "fast street driving and heavy braking" which MIGHT fit! They are said to reduce brake dust a LOT, according to the manufacturer. They're only $80 a front set, including shipping. I just ordered a set!

#6 of 34 Re: Additive and Pads [rmozol] by eagle75

May 16, 2006 (1:37 pm)

Replying to: rmozol (May 15, 2006 11:03 am)
Be interested to hear how the pads work out for you. The original front pads on my former '04 Bonneville GXP were replaced by the dealer at 30k miles (they were about worn out) with ceramic pads, and that eliminated 90% of the brake dust. I should have done that early on.

#7 of 34 GXP Computer Chip by smallegan

Jul 17, 2006 (7:22 am)

Has anyone has their computer chip reprogrammed. I am interested in getting the rev limiter removed and possibly tweaking some of the other programs. I found a place where you can buy the programmer for the 05 GXP online but I have an 06. Will this work for me?
 
Also has anyone modified their exhaust? I love the low end idle rumble but my GXP seems to lose it roar at higher speeds...
 
And what about the potential of a supercharger or turbo? I have read that there is a possibility that the transmition can only handle the stock engine. Any thoughts?
 
Lastly I asked before but got no answer...do we have anyone here who has put in aftermarket car audio equipment?
 
Thanks,
Ryan

#8 of 34 Re: GXP Computer Chip [smallegan] by erichthecatt

Jul 17, 2006 (11:54 am)

Replying to: smallegan (Jul 17, 2006 7:22 am)
(Also has anyone modified their exhaust? I love the low end idle rumble but my GXP seems to lose it roar at higher speeds(
 
I took the stock mufflers off of my 05 bonneville gxp, and put on the flowmaster "hush power 2" Wow, what a differance. Has a great low rumble tone, and a great sound on take-off, depending on how heavy your foot is. Ive had people back off at a green light, and i know its the intimidation of the growl. check out their website, and you can actually hear the mufflers. I was really surprised because the sound was pretty much identical to the way mine sounds. GAry

#9 of 34 Re: GXP Computer Chip [smallegan] by tlauro

Jul 17, 2006 (3:05 pm)

Replying to: smallegan (Jul 17, 2006 7:22 am)
I would caution you against any after market chip reprogramers for the LS4 as I've yet to see any real results from them So far the only two companies doing any program tweaking have to have the original PCM's and they reprogram them from there. Both have worked very well and result in about a 15hp increase and of course tranny shifting and limiter changes/removal. Basically the LS4 runs a bitch rich and of course lean is mean as they say.
 
No one to date has had any issues and we're looking at some with 8mos of use and many track miles on them. Feel free to email me for pointers to other boards that will allow you to study this more.
 
Tranny wise, you won't have a problem. Not sure if the tranny will handle the constant power, but IMO, I'd go turbo. Better gains, more power and easier on the tranny in terms of power delivery.
 
Exhaust wise, the best results I've seen while not turing it too loud is the removal of the resonator. Deeper growl and throatier up top. Here's a sound clip of a friend with it removed. http://www.unr.nevada.edu/~yuichiro/movies/wot.wmv

#10 of 34 Re: GXP Computer Chip [tlauro] by smallegan

Jul 17, 2006 (3:45 pm)

Replying to: tlauro (Jul 17, 2006 3:05 pm)
Thanks for all of the information! I am a bit confused regarding the the chip reprogramming. You said you would caution against them but they do work and put out an additional 15HP? One of the main things I would like to do is remove the rev limit, it annoys the hell out of me!
 
I watched that movie and loved the way that sounds. How hard is it removing the resonator on the GXP?
 
Also you said you know of some other boards that discuss these types of mods please feel free to shoot me a list I am looking for all of the info I can get.
 
-Ryan

#11 of 34 Re: GXP Computer Chip [erichthecatt] by smallegan

Jul 17, 2006 (3:46 pm)

Replying to: erichthecatt (Jul 17, 2006 11:54 am)
hmm sounds nice, does the Bonnie GXP have a rev limiter?
 
-Ryan

#12 of 34 Re: GXP Computer Chip [smallegan] by erichthecatt

Jul 19, 2006 (1:52 pm)

Replying to: smallegan (Jul 17, 2006 3:46 pm)
My 05 bonneville gxp has the rev limiter. I dont mind it being there though. My bonneville just had the two mufflers at the rear that i switched out for the "hush power" muffs. Is there somehow an internal resonator thats removable from the muffler? I kept my original muff's so maybe ill dig them out of the garage and see whats there....

#13 of 34 Re: GXP Computer Chip [erichthecatt] by smallegan

Jul 19, 2006 (3:22 pm)

Replying to: erichthecatt (Jul 19, 2006 1:52 pm)
I haven't been able to get fully underneath the GXP but the way I understand it there is a resonator that is a piece of the pipe on the GP GXP's I am not sure if the same resonator exists on the Bonneville.
 
I went down and asked the the local exhaust shop what it would take to remove it and he said he would just patch it straight through for about $50.
 
Also regarding the rev limiter, I had my dealer talk to his service team about removing it and they said it would void the warranty...Rats...

#14 of 34 Aftermarket car equipment by gpgt1

Jan 12, 2007 (11:53 pm)

Replying to: smallegan (Jul 17, 2006 7:22 am)
I have installed alot of aftermarket car equipment. What questions do you have if you still have any?

Messages Page 2 of 4

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