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2008 Pontiac G8

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  • tayl0rdtayl0rd Posts: 1,938
    Why hasn't this been deleted yet??? It's too big! I'm mortified that I actually have to scroll left and right! :P :P
  • paisanpaisan Posts: 21,181
    A Subaru Liberty Wagon 2.0 litre turbo with the STI bits, nice.
    Funnily enough I was looking at getting the sedan version but $50k was
    a bit too much to pay, so settled on the VZ.


    Yah, it's actually a 2.5L over here. 243hp/243lbs torque, but added a few goodies (STi Pink Springs, Koni Struts, Group N front strut top mounts, SPT Exhaust, and a Cobb AP Chip/Tuner/Programmer) so I dynoed it at 212hp/243lbs torque at the wheels, with AWD that translates to roughly 280hp/320lbs torque at the flywheel.

    I'm looking at the G8 GXP as my Summer Daily Driver and keep the subie for the track and winter duties.

    -mike
    Motorsports and Modifications Host
  • holdenguyholdenguy Posts: 145
    Mate, it`s just the advert crap on the right gets in the way of the pic, then the writing gets buried as well.
    I would have edited my reply to Mike to make it fit better but the edit button got buried.
  • holdenguyholdenguy Posts: 145
    Ok, when you log straight in to the last page, the advert crap is there.
    Then you go back a page, then forward and the advert crap is not there.
    Very funny, I`ll know next time.
  • holdenguyholdenguy Posts: 145
    209 kw at the fly ain`t too bad mate.
    I`m working off hp divided by 1.34 .
    Is that the right calculation to use?
    Just wondering as down here they are
    184kw and 339Nm stock.

    Also, earlier question I had for you,
    What do they put the LS3 in over there?
  • Karen_CMKaren_CM Posts: 5,032
    ...has been removed.

    Community Manager If you have any questions or concerns about the Forums, send me an email, karen@edmunds.com, or click on my screen name to send a personal message.

  • paisanpaisan Posts: 21,181
    Also, earlier question I had for you,
    What do they put the LS3 in over there?


    Not sure, is that the 6.2L engine? If so the CTSV gets it and the ZR1 Corvette, both those are Supercharged versions. The GXP here will get the 6.2L NA engine with about 405hp/400lbs torque.

    -mike
    Motorsports and Modifications Host
  • holdenguyholdenguy Posts: 145
    Mike,
    Yep, the LS3 is a 6.2.
    The Vette is supercharged? wow, how much grunt and what type of blower?
    Also, you say that the GXP does 405hp, our version in the HSV`s puts out 425hp.
    When you get it, take it to a Tuner and get a custom tune done after you put a OTRCAI on it.
    That will fix it ;-)
    Does the Vette have OTRCAI? Because if you can`t get one, I know a few places here that have them.
    Here is one, scroll down the page for the pics.

    http://www.ls1.com.au/forum/showthread.php?t=88344

    Here is actual video of the OTRCAI.

    http://video.google.com.au/videosearch?q=LS3+HSV&hl=en&emb=0&aq=f#q=LS3%20HSV&hl- =en&emb=0&aq=f&start=10
  • paisanpaisan Posts: 21,181
    The CTS-V and the ZR1 both use Eaton SuperChargers on them. The ZR1 puts out about 600hp IIRC and the CTS 556hp.

    -mike
    Motorsports and Modifications Host
  • paisanpaisan Posts: 21,181
    Nice HSV. I'm hoping the GXP is very similar to that one.

    -mike
    Motorsports and Modifications Host
  • Was at the track yesterday and 2 very seasoned drivers put a '08 Jetta Wolfsburg 2.0T w/6pd auto against a '08 G8 6.2 auto on the 1/4 drag.

    The Jetta beat the G8 by just over 1/2 of a second. It looked like the G8 had the race from thee start, but I guess that was becuase of the Jetta's turbo lag. The Jetta pushed ahead by about half-way down the track for the win.

    I later drove both cars on the auto course and I really liked the initial power of the G8, but the handling of the Jetta to me made it the better driver. The Germans really do make nice cars. I'd say a stiffer suspension in the G8 would be a must do for any road course work. Nice car though for V8 American power.
  • rayainswrayainsw Posts: 2,576
    Hmmmmm . . .

    http://www.motortrend.com/roadtests/hatchbacks/112_0808_2008_volkswagen_gti_firs- - t_look/index.html

    “The 16-valve turbo churns out 200 hp at 5100 rpm and 207 lb-ft of torque from 1800 rpm up to 5000, with a 6500-rpm redline. All that boosted power is good for 0-to-60 sprints in 6.1 sec and a quarter mile of 14.7 sec at 94.2 mph in our test car.”

    http://www.motortrend.com/roadtests/sedans/112_0806_four_cylinder_midsize_sedan_- - comparison/altima_camry_passat_specs.html

    “15.0 sec @ 93.4 mph”

    Curb weight: 3413 lb
    200 HP \ 207 TQ - A6 trans.

    = = =

    G8 GT test ( also Motor Trend ) shows:

    http://www.motortrend.com/roadtests/sedans/112_0804_2008_pontiac_g8_vs_2008_dodg- - e_charger

    13.8 @ 102.8

    That is such a large difference that my ** GUESS ** is this particular VW’s turbo 4 had been ‘chipped’ – and was producing well over the stock HP \ TQ numbers . . .

    - Ray
  • It very well could have been chipped, I can't say with 100% certainty that it wasn't. Only that the owner said the car was all stock. Could also have been track conditions as well.

    But for the road course, I'll stand behind those comments.
  • paisanpaisan Posts: 21,181
    Definitely chipped, could still be "stock parts" but with a chip on a turbo you can get A LOT more HP/Torque.

    As for the G8, just an FYI, the 08 is a 6.0L the 6.2L doesn't come out til 09 and only in the GXP which will get a 6MT option and upgraded brakes and suspension.

    As for Auto-x having done it for 6+ years, any light car will beat a heavy RWD sedan!

    -mike
    Motorsports and Modifications Host
  • rayainswrayainsw Posts: 2,576
    With the new incentives just announced, a dealer with a 2009 G8 GT in the color I’d buy & with the options & packages I’d want says the selling price would now be approx. $2K below invoice.
    MSRP $34.1K ( approx. )
    Sell $30.1K ( approx. )

    - Ray
    Worth a 20 minute drive to look & drive & investigate a possible ‘deal’ sometime very soon. . .
  • Weight is no where near as important as suspension setup and weight distribution. In the old days a total weight made a big difference because the added weight per a square inch of rubber contact did not add enough traction to compensate for the additional overhead of breaking or making directional changes on a vehicle that has more weight/momentum to resist change. That said, huge improvements in tire technology have changed this phenomena. For example, a dodge viper weights 3400 lbs and handles pretty good.The first thing taught in racing school is how to keep the weight even as possible on all four wheels for optimal handling. I own a 09 G8GT and a vette. The G8 GT is a balance vehicle which handles good not great. It is an excellent compromise between handling and ride. When I get out of the g8 and get into the vette the difference between the two is huge. For me personally, I would prefer a stiffer suspension and heaver sway bars. Most average drivers would not want to make the trade off since the ride will deteriorate. GM is smart to offer the GXP which will most likely provide a better package for me. Comparing a RWD car that has 50/50 weight distribution to a FWD vehicle that has 60% of the weight on the front tires is crazy. FWD cars never feel balanced and are boring to drive. You can't change the angle of the car when negotiating corners, weight transfer during takoff kill traction, torque steer, rear tire liftoff during hard breaking are all bummers on any FWD car. The FWD design is [non-permissible content removed] backwards.
  • rayainswrayainsw Posts: 2,576
    "I own a 09 G8GT and a vette. The G8 GT is a balance vehicle which handles good not great. It is an excellent compromise between handling and ride. When I get out of the g8 and get into the vette the difference between the two is huge"

    Can you elaborate a bit?
    My current 'ride' is a 2007 Corvette Coupe...
    Thanks,
    - Ray
    Driven 2 2008 G8 GTs - and off to drive a 2009 tomorrow,
    if the planets align.....
  • When you jerk the steering wheel back and forth on the vette going say 40MPH it is obvious that the car is two inches off the ground and there is virtually no sway in the suspension. Feels real crisp. When you do the same in the G8 there is some sway and give initially. That said, when you drive on a twisty washboard road with the vette the impact of the washboard surface is harshly transmitted into the cabin. It also bounces around a bit. They probably don't have much rubber to isolate the suspension, sway bars, etc. Furthermore, the vette takes a bit more attention to drive since wider tires follow road surfaces easier, etc.

    I tested quite a lot of the new cars prior to buying the G8. The G8 is by far the best bang for the buck. I liked the CTS too but interior space is superior in the G8.

    The g8 rides more like a 5 series BMW or Mercedes than a Maxima or Accura. Torque from the V8 is also a big plus.
  • rayainswrayainsw Posts: 2,576
    Hm.
    I appreciate that - is your Corvette a Z06?
    If not, is it Z51?
    or 'Base' \ F55?
    Thanks,
    - Ray
    Base Coupe...
  • paisanpaisan Posts: 21,181
    Weight is no where near as important as suspension setup and weight distribution. In the old days a total weight made a big difference because the added weight per a square inch of rubber contact did not add enough traction to compensate for the additional overhead of breaking or making directional changes on a vehicle that has more weight/momentum to resist change. That said, huge improvements in tire technology have changed this phenomena. For example, a dodge viper weights 3400 lbs and handles pretty good.The first thing taught in racing school is how to keep the weight even as possible on all four wheels for optimal handling. I own a 09 G8GT and a vette. The G8 GT is a balance vehicle which handles good not great. It is an excellent compromise between handling and ride. When I get out of the g8 and get into the vette the difference between the two is huge. For me personally, I would prefer a stiffer suspension and heaver sway bars. Most average drivers would not want to make the trade off since the ride will deteriorate. GM is smart to offer the GXP which will most likely provide a better package for me. Comparing a RWD car that has 50/50 weight distribution to a FWD vehicle that has 60% of the weight on the front tires is crazy. FWD cars never feel balanced and are boring to drive. You can't change the angle of the car when negotiating corners, weight transfer during takoff kill traction, torque steer, rear tire liftoff during hard breaking are all bummers on any FWD car. The FWD design is [non-permissible content removed] backwards.

    While you may be right about suspension setup and tire technology, given 2 cars, same power, same size tires, and one weighs in at 3300lbs and the other 4000lbs, the one that weighs in at 3300lbs is the one who is going to handle better.

    I agree with the ideas of FWD v. RWD, however you CAN tune a FWD suspension to handle and feel good. For instance, I'd put any FWD race car up against a stock G8 and the race car will feel better, handle better and turn better lap times.

    In most racing organizations for road race, they actually decide on what class you are based on HP to Weight Ratios. Not FWD v. RWD v. AWD. Show up with the Dyno Sheet and put your car on the scales...

    To that end, for a street car, the G8 is a great compromise of size, ride, and handling. I don't expect the suspension upgrades on the GXP to be anything earth shattering. Nothing you couldn't get from Konis + Bushings + Spring + Sway Upgrades on a G8 GT. The GXP really is giving you the 6.2L engine, and the 6MT as the significant items that can't be had in the aftermarket.

    Suspension and Brembos both are easy aftermarket bolt ons as far as I'm concerned.

    -mike
    Motorsports and Modifications Host
  • rayainswrayainsw Posts: 2,576
    "Suspension and Brembos both are easy aftermarket bolt ons
    as far as I'm concerned."

    Easy - perhaps.
    For those more mechanically adept than I.
    Not typically 'cheap'....
  • rayainswrayainsw Posts: 2,576
    So – I drove a 2009. The current incentives bring the actual transaction price of a G8 GT ( Premium, Sport, Roof ) to approx. $2K below invoice. Just over $30K, on this ‘old invoice’ 2009.

    Executive summary:

    I do like the G8 GT – a lot.

    Background:

    I currently drive a Corvette Coupe with A6 \ 6L80 trans. – driveline is very similar to the G8 GT. I have driven 2 2008 G8 GTs. And posted my impressions here – several months ago.

    I waited for the 2009 for 3 primary reasons:
    1 = A [ model ] year of US production. In case there were any significant issues.
    2 = XM.
    3 = A color I really wanted = Silver.

    I was also hoping [ expecting? ] that GM \ Pontiac \ Holden would address the few issues I had with the drivelive.

    Impressions:

    Compared to my Corvette, the G8 GT [ even with the Sport Package & 19” wheels \ relatively low profile tires ] is a much less ‘intense’ riding car than my Corvette. Understandably so. Yet I was still pleasantly surprised that the ride \ handling compromise is so close to what I would consider ideal – for a 4DR high-performance sedan. Well controlled & well damped.

    The interior is somewhat ‘plain’, one could argue – and the missing “Atari Gauges”, with only a very small rubber shelf & not even a raised lip seems a rather odd solution to THAT issue. Oh, well.

    I find the seats comfortable & supportive, the visibility good. The ergonomics are generally OK. Nothing fancy here – but very functional.

    I will certainly miss the HUD, and particularly the ability to display the MPH, RPM and the current gear selected a whole lot closer to my line-of-sight than the DIC. Again – oh, well.

    The trans. appears better sorted \ tuned \ programmed than the 2 2008s I drove some time back. Upshifts and downshifts were quick & well-managed. Downshifts in particular were smoother than in those 2008s. I will miss the paddle shifters on my Corvette. One more time: Oh, well.

    Think, think, ponder ponder . . .

    - Ray

    F.Y.I.
    Here are my trans. comments from a test drive of a 2008 G8 GT.

    The trans. downshift behavior still concerns me a bit. I currently drive a GM V8 with the 6L80 trans. Corvette Coupe. With 2007 calibrations & hardware version. For 2008 the 6L80 version in the Corvette was substantially revised & updated ( hardware & software ) to quicken both the upshifts and downshifts – and to do a better job ( by some reports ) on the “rev match on downshift”. My 2007 does not do this at all ( or does it so poorly as not to be worthy of the name ) on 3 – 2 or 2 –1 downshifts.

    Sadly, though, both of the 2 G8 GTs I have now driven seem to do a reasonably good job when manually commanded to downshift from 6 – 5, 5 – 4, and 4 – 3 ( the relatively “easy” ones ), but - I was ** NOT ** impressed with the 3 – 2 or 2 – 1 downshifts I tried. And I tried several.

    These were not at all extreme downshifts – not 3 – 2 at 60 or 2 –1 at 35, for example. More like 3 – 2, while slowing through 30 or 25 MPH and about to accelerate – requiring a ‘blip’ to something like 2500 RPM. To me, these downshifts felt more like someone driving a manual trans, downshifting, and abruptly letting out the clutch – without a throttle blip. Seems to accomplish the actual downshift a bit more quickly than mine – and responds a bit more quickly – meaning: command to beginning of shift execution seems a bit quicker. But not nearly what I had hoped for, however, after reading the 2008 Corvette technical data & reviews.

    Somewhat disappointing. Probably not a deal-breaker, for me.

    Note: The trans. ** DOES ** perform ( in several respects important to me ) much better then the 6L50 in a 2008 Caddy CTS I rented & drove a couple of hundred miles last month . . .
  • Excellent post "paisan". No matter what, I would still always prefer RWD. I love the feeling of power sliding a RWD car. Also there is the challenge of shifting as much weight as possible to the rear wheels during takeoff. Although, with the G8 Auto this is not an issue (accept in the rain), it barely lays rubber during acceleration. No FWD vehicle can provide me with such enjoyment. Then there is the torque steer issue. Every time read an article about a FWD sport sedan, the first thing stated "torque steer is virtually eliminated". That's when I know the author owns a FWD.

    As far as after market parts, etc, those days are done. I have gone as far to weld on custom stabilizer bars, etc on some of my past dinosaurs. I purchased the G8 for a daily driver vehicle for my wife and a family car for both of us. As such it blew away the competition. Maxima, Avalon, Taurus, Accura products, Chrysler products, etc. The interior is spacious, plus it feels very confident in both in the twisties and at high speeds on the highway.

    The only other comment about the weight/suspension issue that was not mentioned was size of vehicle. I bet there are tracks where you can get a midget FWD car to beat a Viper. Just make the turns tight enough to make the Viper feel huge. Yet on a huge oval track a super small lightweight vehicle would not be ideal.

    Larger size/longer wheel base aids in tracking. For example, I own a F150 and it is a no brainier to drive on the highway. It is like having laser steering. The G8 tracks awesome on the highway especially at speeds above 80MPH
  • eliaselias Posts: 1,941
    Great to hear about the testdrives & incentives on the G8s. Combining with GM card can make it an even lower price. Maybe GM card roundups will happen in a month?

    I see so many comments about the auto trans which make me think some of you peeps are REALLY going to rave when you drive the G8 with V8 & stickshift...
    There's probably no way i'd trade vehicles now since I have an 'optimal' pair of used vehicles, but if I were to trade 2 used for 1 new, it's fun to at least consider:

    G8 GXP...
    09 camaro SS (the v6 starts under $23k!)
    09 base vette 6-spd, (recent-year/used more likely)
    08 or 09 saab 9-3 6-spd wagon (a pal just bought 08 new under $24k with all options!)
    vw tdi 6-spd wagon. (similar price to the saab)

    I would probably like that wonderful G8-El-Camino monstrosity that Holden was going send to USA before GM ran out of money for any additional outrigger-canoes to transport the cars from Australia.
  • What a car!? This just came up on my rader after doing some car shopping. I have read about it and today I went and checked it out. How GM has improved. I went out and did some shopping for a new 09 Maxima SV and after not getting the deal I wanted did more searching. I looked at the 09 Acura TL, 08 Infiniti M35 great cars but have to pony up a bunch of cash. The M35 was the most fun with a great exhaust note and RWD, but it came down for bang for my buck. I think I am now in love with the Pontiac G8.

    With the MSRP and great incentives, I think it would a great buy compared to the others out there.

    Today I sat behind the wheel and just soaked it all in. What a nice vehicle. With a small family, I cant justify spending money on a BMW but with the Vette engine and 4 doors, I think the G8 could work. The seats were great, great plastics and dash, yet a bit more style is needed. GM has a winner with this but they need to give us a bit more style.

    First of all, the center caps on the 19 rims look like a matchbox toy's plastic center. Give us more Rim options. The gauges could use some silver rims around them and some two tone color. Homelink and those cool GXP gauges. And a 8 way power seat.

    I read about the updates to the 2009.5 with Bluetooth, rear cupholders are coming which make better sense.

    Any of you that have driven a GXP prototype think it could pass as a family hauler or would it be too much vehicle?

    This vehicle is so close to stealing the show from the others in its category, even a few higher ups. Why not drive a great priced four door sports cars? This family man wants it!
  • eliaselias Posts: 1,941
    mach speed 1, dude, I use an 05 GTO as a family-hauler and am considering (fantasizing) about a G8GXP for that . I think there will be great GM-card round-up offers just before GM becomes nationalized and/[or acquired by Citroen, maybe later this year or next year! :|

    My GTO would be better for family-haulin it had 4 doors and a good snow-wheel/tire solution. 100% of adults who sit in the back of the GTO comment about how they are surprised how comfortable it is.

    GXP has bigger brakes than G8-GT? I am wondering about possible snowtire solution for both G8 GT as well as G8 GXP, will browse around tirerack to fantasize about wheels/tires for my imaginary G8 GT, probably they don't have the GXP info on there yet.
  • paisanpaisan Posts: 21,181
    The GXP gets 4-piston Brembos. They are larger and probably lighter than stock.

    -mike
  • From my experience, the g8 auto is best left in sport mode when racing around. I have driven several (foreign and American) vehicles with the manual shift feature and they never seem to produce crisp accurate down or up shifts (my daily driver is a vette w/6 speed manual). Timing is critical during when horsing around. I wouldn't want to see a Maxima blow by me while I wait for a manual gear change. I don't see why they can't seem to get the Auto to shift instantaneously. Automatics if implemented correctly can provide benefits over a standard. For example, power to the rear wheels is lost when you shift a standard.

    In regular mode, the G8 auto seems to change gears with economy in mind. Sport mode seems to keep the engine in the power band. The transmission works decently in sport mode.

    I do know that todays autos are totally controlled via firmware (embedded software). I have a 05 F150 that had weird shift points and manual control was impossible at best. I made a complaint to ford and they updated the software. The transmission now shifts totally differently and manual control is much more precise. I am hoping GM will issue a firmware upgrade for the G8.

    One other oddity I see with the G8 is that the engine does not provide much breaking power when down shifting. Maybe the cylinders are deactivated (valves open) when down shifting. I think it is a joke when auto writers complain about the fact that pushing the shift lever forward instead of backwards produces up shifts. This is more intuitive to me since it is the same way I shifted bikes/floor autos all my live.
  • rayainswrayainsw Posts: 2,576
    This ** MAY ** help:

    Here is the text of a bulletin [ TSB ] including the VIN breakpoint.

    #08-07-30-036: Automatic Transmission Delayed Downshift,Lack of Acceleration, Flat Spot (Reprogram TCM)- (Aug 13,2008)
    Subject: Automatic transmission delayed downshift,lack of acceleration,flat spot(reprogram TCM)
    Models: 2008-2009 Pontiac G8 GT with automatic transmission(RPO MYC) built prior to VIN breakpoint 9L210304
This discussion has been closed.