2007 GXP vs 2008 GXP ...Differences? - Pontiac Solstice Forum
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post #1 of 29 (permalink) Old 03-28-2012, 08:03 PM Thread Starter
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2007 GXP vs 2008 GXP ...Differences?

Hi all, I was just wondering what the differences/changes were from the 2007 GXP to the 2008 GXP ...is there a big reason to buy the 2008 over the 2007??
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post #2 of 29 (permalink) Old 03-28-2012, 08:19 PM
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08 has TPMS. boo hiss
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post #3 of 29 (permalink) Old 03-28-2012, 08:31 PM Thread Starter
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is this desirable or not, lol =]
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post #4 of 29 (permalink) Old 03-28-2012, 09:03 PM
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'08 has TPMS. boo hiss
Yup, another Federal Mandate to protect those too dumb to check their tires.

t In hoc signo vinces.
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post #5 of 29 (permalink) Old 03-28-2012, 09:10 PM Thread Starter
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im guessing people are not very fond of it?
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post #6 of 29 (permalink) Old 03-28-2012, 09:27 PM
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TPMS (government mandatory, but while I detest government meddling and control, I like the TPMS. See my tag line.)
Electric seat height adjustment
OnStar mandatory (booo!)
Engine control chip (different, but I don't know the differences.)

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'Mysti' - '08 Mysterious 5-spd GXP, Custom HP tune, Hahn I/C, K&N filter, DDM ProBeam & Backbone, splash guards, Z0K Sway bars, poly bushings & BC Coilovers, Magnaflow catback..

One by one, our government is chipping away at our individual liberties. Don't let it happen.

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post #7 of 29 (permalink) Old 03-28-2012, 10:00 PM
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Most 07s (but not all) have electric seat height adjustment. Mine does.
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post #8 of 29 (permalink) Old 03-28-2012, 10:02 PM
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Didn't the '08s have some issue that needed to be resolved regarding the new vacuum assisted brake booster or was that only on the '08 Skys?
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post #9 of 29 (permalink) Old 03-29-2012, 06:14 AM
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Didn't the '08s have some issue that needed to be resolved regarding the new vacuum assisted brake booster or was that only on the '08 Skys?
Some early model-year '08s had the change, mine was one. There was an ECM re-program that apparently cured the issues and I certainly had not had any lack-of-boost issues on mine. Later 08s went back to the old way.

Owner of "Campbelle", a Brazen 2008 GXP ... with mods piling up...
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post #10 of 29 (permalink) Old 03-29-2012, 09:31 AM
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yep, 07 with electric seat height...

I like the idea of TPMS when it is applied correctly. My G8 tells me what each tire pressure is. Some do not to the extent, the TPMS warning dings telling you to check all tires. If one is flat it is not a big deal, but when its 30 degrees in the morning and one tire is probably a pound or 2 low, I would rather see it than search for it.

As I do not have TPMS, how is it applied or monitored in the 08s?

09 G8GT, Stryker, sport/prem
08 GXP, Mean, Auto
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94 Bronco XLT, 5.8L, very rusty and 35s
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post #11 of 29 (permalink) Old 03-29-2012, 09:45 AM
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The TPMS has been useful. Our version is very accurate and gives you the the pressure for each tire. The DIC displays them in pairs, First the fronts then the rears.

I personally like it.

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post #12 of 29 (permalink) Old 03-29-2012, 10:15 AM
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TPMS is more electronics outside the car in an extreme environment to go wrong. And you have to pay when swapping wheels, etc. Cars have been fine without TPMS for 100 years. Just my opinion.

FWIW the 08 cars have some running updates that you won't see in literature. For example, I remember that the top frame inflection points were updated from metal ends to plastic because the hard-edged metal was ripping the top. There was a big thread on this here years ago. I had my solstice updated to the new parts under warranty based on this info. Search for it if interested.
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post #13 of 29 (permalink) Old 03-29-2012, 11:23 AM
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I like being able to see what the tire pressure is while I am in the car.
No need to carry a separate gauge.

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post #14 of 29 (permalink) Old 03-29-2012, 02:43 PM
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08's have the accustic headliner as standard. On 07's it's available but you gotta be sure yours has it. Should help a lot with road noise while the top is up (if the top is ever up).

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post #15 of 29 (permalink) Old 03-29-2012, 03:02 PM
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Functionally they are identical. I have an 07 and an 08. The only visible difference is that the 08 has TPMS that displays in the DIC. The fact that it has TPMS means that you must reprogram the location of each sensor when you rotate the tires, or you can just ignore it and remember which is front and which is rear. Also if you buy new wheels, you will need to purchase wheel sensors and it’s something else to go wrong. I prefer the car without them because I maintain my car and know what the pressures are the old fashioned way.

Early 08s had a running design change that eliminated the electronic vacuum pump. If you look on the side of the block under the intake manifold (drivers side) you will see no electric pump mounted. There was a big fuss made about this and some drivers claimed it was a significant issue for them. My personal experience is that occasionally after the car has been sitting for several days, there will be no stored vacuum to assist the braking. This results in increased brake pedal travel and pulsing of the brake pedal as the on board hydraulic brake assist provides the force needed to activate the service brakes. There are two levels of fix for this issue. First is a software update that modifies the engine code during warm-up. The baseline is designed to warm up the cat. The changed code is designed to create vacuum on startup. If the software fix does not satisfy the owner, he can ask for the hardware fix. There is a kit that a dealer can install that retrofits the electric vacuum pump to bring the car back to 07 and 09 standards. About half way through the production run of the 08s, the design was changed back to the old baseline that included the electric vacuum pump.

The convertible tops had issues initially that were addressed in the 07 production. However the early 07 production had plastic fittings that mated with ball joints which failed prematurely. They were replaced with metal ball joints in later production. If you have one of these ball joints fail, you can replace it with the metal one. There are type 1 tops and type 2 tops. The latter have had all the upgrades built into them.

The acoustic liner was optional in 07 and became standard in later years.
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