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2004 Pontiac Bonneville GXP (LD8)
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14 Posts
Discussion Starter · #1 ·
This 2004 Bonneville GXP was owned most recently by Erik (Rocket88), and previously by the talented Jake (97EldoCoupe) of Northstar Performance.

Erik had gotten a new company car (2010 300C) late last year and needed to get rid of the Bonne - and this is where I stepped in. It replaced my beloved but aging 1995 SSEi with Series 1 L67.

From my understanding, when Jake took ownership at 120,000km the LD8 had suffered some sort of major failure (broken valve spring?) and was rescued with the stud kit, new heads, one piston, and intake. I'm not sure if anything else was done (porting?) while Jake was in there performance-wise, but the motor most certainly pulls VERY strong and runs amazingly well at the 145,000km that the car is at now.

The underbody and chassis is amazingly clean, but some of the interior gadgetry has seen a few better days.. burnt out gauge cluster bulbs and dead coolant gauge. Those will be longer term fixes.

I currently have 17" winter rubber on (had a heck of time finding a 17 that would clear the 12.6" front brakes and calipers shared with the 05+ STS), but can't wait to get the GXP 18's back on.

Some pics:



(yes, that dealer badge WILL go away soon)







and my old SSEi:



 

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'08 DTS Lux III Blk Cherry, '89 Brougham d'Elegance Dip Blue
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4,847 Posts
The GXP is a sharp car, but I really love the styling on the SSEi. The exterior is just aggressive enough and the interior is well laid out with nice seats, great instrumentation, and more buttons than you can shake a stick at. Damn, now I want one again.
 

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1992 STS / 2005 MB G500 / 2003 STS / 2006 XLR-V
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11,694 Posts
I may like your "winter" wheels even more than the factory ones! Great choice.

Get that coolant temp gauge fixed! Never know when you might need it.
 

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02 Escalade | 02 Corvette "Goldilocks" | 03 Blazer 4x4 | 92 Caprice Wagon LS1/T56
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19,764 Posts
Love those wheels. Sharp car. :)
 

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2004 Pontiac Bonneville GXP (LD8)
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14 Posts
Discussion Starter · #6 ·
Thanks guys! For some reason I still like the stockers better, I took this photo at a Bonne meet last year - I didn't realize that it would eventually be mine! Would be great if I can find four chrome Grand Prix GXP rims instead.



Coolant gauge will also be fixed with an Aeroforce Interceptor scangauge. This way I'll have access to hard numbers and a ton of other parameters too.

As for my SSEi, it sadly is no more. A week after I sold it, a careless driver rear-ended the new owners. Totalled. :crying2:

40-120 km/h (25-75mph) pull:
The GXP seems to be a bit of an oddball in that it has the LD8, but the 3.71 gears?
 

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02 Escalade | 02 Corvette "Goldilocks" | 03 Blazer 4x4 | 92 Caprice Wagon LS1/T56
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19,764 Posts
Okay - that N* sounds damn good in there.

:drool:
 

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2004 Pontiac Bonneville GXP (LD8)
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14 Posts
Discussion Starter · #8 ·
From the outside... the stock exhaust seems to be tuned to be louder than the Cadillacs!

 

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2004 Pontiac Bonneville GXP (LD8)
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14 Posts
Discussion Starter · #10 ·
You better believe it :D

It does sound quite good and is decently loud, but I'm still debating on whether or not to replace the mufflers with something else in search of a deeper tone.
 

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1992 Town Car Cartier & 2014 Accord LX MTX
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34,087 Posts
A couple of nice looking Bonnies you've got there! I really like those winter wheels on the GXP, and the SSEi looks more badass than ever, thanks to those American Racing wheels. How do you like the Northstar v. the Supercharged 3800?
 

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1992 Town Car Cartier & 2014 Accord LX MTX
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34,087 Posts
The Northstar is really a very impressive sounding engine.
 

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2004 Pontiac Bonneville GXP (LD8)
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14 Posts
Discussion Starter · #16 ·
A couple of nice looking Bonnies you've got there! I really like those winter wheels on the GXP, and the SSEi looks more badass than ever, thanks to those American Racing wheels. How do you like the Northstar v. the Supercharged 3800?
Thanks :) Those AR Torq Thrust style wheels are actually OE 2005+ Ford Mustang 17x8's, with blank centre caps instead of the Ford ones. They have a FWD offset, and as long as the balance is good and they're torqued up properly (5x114.3 vs. 5x115), they're perfect!

The supercharged 3800 and the Northstar feel like COMPLETELY different beasts. It's an even bigger difference because of the Series 1 SC from 1992-1995 model years. It makes its torque at way lower RPM than the Series 2 - countless times passengers will wonder if I'm going WOT when I'm in fact "only" making a 3000rpm pull in 2nd gear. Unfortunately it totally runs out of breath at anything past that. Relatively speaking, the LD8 is a torqueless wonder and the SSEi should have no problem taking it from a stop - but once that Northstar winds up past 4000rpm, watch out :D

Given the choice, I would go with the Northstar. Much more refinement for a daily driver and overall higher performance, stock for stock. It does have less moddability, but I don't plan on increasing current power levels any.

Track run, 15.57 @ 88.7:
 

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2004 Pontiac Bonneville GXP (LD8)
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Discussion Starter · #18 ·
Yup... GXP are rarer then hen's teeth here so I'm not so sure how to fix that without spending an arm and a leg (ie, buying new). These cars were only made in 2004 and 2005 and in Canada 232 were sold in 04 and a whopping 94 sold in 05. So I won't find any in scrapyards!

Mostly everything else on the car is GM parts bin, fortunately.
 

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97 ETC x2, 04 GXP, 04 STS x2, 97 ESC, 99 Deville, 05 SRX
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2,608 Posts
I miss that car sooooo much. I wish I never had to sell it at the time. It was my daily driver for a while and it moved like a Northstar should. It's all factory under the hood except for the studs, 2002 cylinder heads (brand new set, factory GM heads).

I have to get back to work. Just to let everyone know- 10 stud kits shipped yesterday and I've worked pretty much all night- sorry if anyone's tried to get ahold of me and couldn't-

The guages- I was going to have N*Caddy do an LED conversion but he did a lot for me already and he was busy too, also the temp guage is an easy fix for someone who has the time, a soldering iron, and buys some cheap stepper motors off ebay. I think if you buy enough at a time they're like $3.00 each.
 

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1992 Town Car Cartier & 2014 Accord LX MTX
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34,087 Posts
What's the difference in quarter mile times between the SSEi and GXP?
 
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