Difference in 04+ GTP over 01 Buick Regal?

[TurboTPI]

So I'm about to pick up an 04 GTP. I have a ton of parts from my totaled 01 Regal I'd like to use on the GTP. What are the major differences between to two and tuning wise whats different? I know the 04+ cars have drive by wire, also returnless fuel systems. Whats that mean as far as putting my 340lph fuel pump in and hot wire and 60# injectors in it? And i assume the turbo setup from my regal should be a pretty simple swap into a 04 GTP right? Thanks guys, I've never owned or messed with any 04+ 3800's. I also have my front ATS Brembo's and rear GXP's. id like to put them on it too.

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[TurboTPI]

Here is the shitbox haha

 

[m_dogg]

Should've went to Green Bay!!
J/K
All I know about these is they don't rust as bad

 

[10sec]

Turbocharged400sbc

 

[TurboTPI]

Supposedly zero rust. Car was parked for winters besides this year. We’ll see. If it all checks out tomorrow I’ll be getting it.

 

[Turbocharged400sbc]

There is a carbon fiber Inferno hood for it on Grand Prix forums carbon fiber finish

 

[GTPpower]

04+ run constant fuel pressure instead of a boost reference regulator. I would be thinking about switching it to return style depending on how far you want to push the turbo.

I was never a fan of the dbw on the 04 gtp I had. It was just a lot more difficult to get a nice launch on street tires.

 

[SleeperLS]

I forget the years, but transmission range switches were external then went internal( or vice versa)

 

[Turbocharged400sbc]

if its an early or late 04 will mater.... check that it has 3 connections at the fuel filter (same place as 97-03, there's just two going into the filter inlet and one outlet for the in cannister FPR thats plumbed differently from the late 04/05+ with only the evap and single fuel pressure nipple on the cannister. both will take the pump. you may want to go to a return system or not. ifr tables are a little hinky compared to the older cars....FP does change in relation to the tank evap leak tests when the stystem draws the tank down under vac (since the FPR is in the tank its like connecting a vac line to an ext FPR.

so you will want to disable those tests for driving/datalogging to prevent erroneous data

be prepared for a new DBW TB or at least the pedal sensor, these cars fail/glitch really slowly and do so for quite some time before it wears out enough, you notice it actually stumble by this point youve probably knocked the hell out of it during all the glitches as the TAC and PCM do not diagnose the PPS/TPS traces....only circuit integrity. i have controlled the 90mm dbw with the 3800 TAC..

 

[Turbocharged400sbc]

I forget the years, but transmission range switches were external then went internal( or vice versa)

correct in 03+ they are reffered to as IMS Internal Mode Switch where the earlier cars had an external range switch or Neutral safety switch

also only use your knuckles to push buttons the oils in your fingerprints and your finger nails eat the thin rubber button coatings like fucking piranha's on a chicken leg....good luck ever finding a minty 5 button DIC

 

[Turbocharged400sbc]

since you have the inferno lip there (cant tell about the spoiler)....

Inferno Hood, Carbon Fiber, $600 obo

In 43612. It's been sitting in the sun for 5+ years so it's going to need a good polish and wax, or clear coat to look good, but it's not peeling or y

www.grandprixforums.com

 

[10sec]

Man that fits like shit, that would be a waste of $600

 

[1quick]

You can run that fuel pump in the stock configuration or add a return fitting to the top of the canister and convert it to return if you need more volume

 

[Turbocharged400sbc]

the 04 has a return fitting from that 3rd fuel filter nipple, but under the hat is where the in tank FPR is, the returned fuel is discharged into the canister

 

[TurboTPI]

No need for the hood. But I will have to figure out the fuel system. I pulled my entire fuel pump/sender assembly from my regal that I put a 340lph pump in. And the hot wire. Id like to use all that stuff if possible.

 

[Turbocharged400sbc]

You shouldn't have any problems

At most you may have some annoyances with the power steering cooler blinds in regards to the downpipe but that's about it

 

[10sec]

James don't you have an 04 comp G that you're out drag racing on the streets of Hangover Park??

 

[SaturdaysGS]

No need for the hood. But I will have to figure out the fuel system. I pulled my entire fuel pump/sender assembly from my regal that I put a 340lph pump in. And the hot wire. Id like to use all that stuff if possible.

I put the AEM e85 pump ZZP sold in my 04 with no issues with a Hotwire and a voltage booster, FWIW.

 

[v6buicks]

Is the hotwire a plug and play thing? They're really easy to make so modifying it should be ultra simple if necessary. I don't know if the fuel pump plugs are the same though.

 

[TurboTPI]

Yeah, im not sure about the connector, on my regal i bypassed the oem connector on the sending unit anyways. So no big deal.

 

[Turbocharged400sbc]

It will still have the 4 pin Square connector. Unless someone already replaced the sending unit and spliced in the 4 wire flat connector

 

[TurboTPI]

Do these cars have the fuel pump access panel like my Regal did? I havent looked yet

 

[Turbocharged400sbc]

04 and early 05 do.... after that is a negative they were able to cut costs buy a good amount deleting that panel and the associated work making it and installing it

 

[Turbocharged400sbc]

You can feel the tops of the studs and nuts through the carpet padding at the front most edge of the trunk if you crawl in there and feel around

 

[Turbocharged400sbc]

So do you own it yet or what?