2008 G8 GT - G88 589 - "Build Thread" - LS1TECH



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2008 G8 GT - G88 589 - "Build Thread"

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Old 08-05-2014, 11:26 AM   #1
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Default 2008 G8 GT - G88 589 - "Build Thread"

Last updated 8/29/16 post 67...
_____________________________________

Long story short: decided to go from a three-car household down to two so as to put money aside for a larger home. Sold my wife's '12 Malibu and my '02 Camaro and picked up the '08 G8 you see here. For comparison sake, it had 82,5xx when I picked it up last week for $16,500. G88 #589 for those that care.

I'd like to add an intake, headers, and a tune, but my main priority is getting the AFM deleted (electronically for now). I honestly never paid much attention to the L76 engines, but I'm pleasantly surprised to have learned they have the L92 heads and LS3 intake.

I'd love to see this section get more action (and that is certainly a goal of mine as a mod), but in the mean time, is there a preference between G8Board and Grrrr8? Any nuances or whatnot that you'd suggest I pay attention to with the car would be helpful as well.

I'll be updating this thread as time progresses just as I did with my Camaro thread: 2002 Camaro SS #7146 build thread

Anyone who followed my Camaro build thread knows I document everything in detail. This includes listing anything that is not as it came from GM. Even things as insignificant as wipers will be listed if they are not GM/ACDelco replacements.

Feel free to comment about anything!

-Steve
________________________________________

Currently making 390rwhp/385rwtq with LS3 cam, headers, vararam, UDP, ported TB, and tune

Modificiations

UMI Performance trailing arms
UMI Performance toe arms
UMI Performance tunnel brace
AFM delete w/LS3 cam
Domin8 tune
Manzo headers
VMax ported throttle body
Vararam intake
Power Bond 25% underdrive pulley (w/Dayco Poly Rib belts)
Hawk HPS front pads
Prothane front sway bar bushings
Whiteline steering rack bushing
Whiteline rear sway bar bushings
Whiteline rear cradle bushing inserts
Moog sway bar endlinks
SPC Performance rear alignment kit
Removed acoustic cover
Removed engine cover
Painted calipers (on car when purchased)
50%? front/30%? rear tint (on car when purchased)
________________________________________













First "mod" was getting rid of the engine cover!


Last edited by demonspeed; 10-17-2016 at 09:23 AM. Reason: Updated mod list
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Old 08-06-2014, 07:22 AM   #2
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Subbed. Good luck with this one. I'm sure that car seat fits a little better than in the Camaro.
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Old 08-06-2014, 07:33 AM   #3
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Looks good. I will be putting up my car for sale within the next year. I will be looking into one as well. Keep us posted on how well the car runs and drives!!!! Whats gonna be the first performance mod? and as far as exhaust check out this one...
http://solo-performance.com/pe-ponti...horty-balanced
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Old 08-06-2014, 08:49 AM   #4
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I am going to try and get AFM tuned out very soon so as to avoid any lift issues. I'd like to add Vararam, long tubes, and a street tune by next spring. The problem is that I promised my wife I would not make this any louder. This is why I want to keep my stock mid pipe/resonator and the stock axle back. I'm likely just going to get a pair of cutouts to run right off the collectors and then install a pair of converters after those. I'm still learning more about this engine/platform, so who knows what may change.
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Old 08-06-2014, 09:35 AM   #5
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Congrats on the G8.

As far as boards, I cannot truly help. I normally just poke around on g8board.com, but have on the other one as well from time to time. Now, get to modding!
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Old 08-06-2014, 01:45 PM   #6
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Quote:
Originally Posted by demonspeed View Post
I'd like to add Vararam, long tubes, and a street tune by next spring. The problem is that I promised my wife I would not make this any louder.
You'd be surprised how quiet a good longtube header/exhaust combo is with these cars. Look into Solo Performance exhaust. I have Kooks longtubes and their Mach Shorty system with high flow cats. (Although different now since I'm cammed,) the cabin noise is pretty calm when you're just cruising under normal throttle, but it screams under hard throttle. Best of both worlds.
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Old 08-06-2014, 06:51 PM   #7
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Can't make the sound crazy, and money is of course an issue BUT!!.... The wifey has to understand that need for savageness that is in your DNA.
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Old 08-07-2014, 01:24 PM   #8
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I'm thinking I settled on Kooks mid-length 1-7/8"/cats combo while also adding a pair of QTP cutouts
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Old 08-08-2014, 02:10 AM   #9
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Not only is that engine cover installed from the factory, but there is also this smaller, insulated cover on top of the manifold to help with NVH from the AFM. That got yanked tonight since I couldn't sleep:



I figured I'll add a pic of the Yokohama AS530's and the calipers the previous owner had painted. At first I did not like the red calipers, but my wife does, so...

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Old 08-08-2014, 11:35 AM   #10
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Happy wife = Happy life.

Miserable Wife = Stone Cold Misery!!!

LOL
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Old 08-11-2014, 08:30 AM   #11
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After pulling the acoustic cover off the other night, my OCD kicked in due to the funk that had gathered under the covers from the previous owner assumingly being "out of sight, out of mind" with everything under the heat traps. Much nicer, but I still need to pull the TB and manifold to clean it out (which I'll do when I install Vararam).




Interestingly, I found some USA-sourced stuff on the Holden




I'll also add that it is truly a pleasure to be working on an engine that's not half under the cowl
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Old 08-11-2014, 12:16 PM   #12
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Much better, I didnt want to say anything earlier but that engine was pretty dusty and dirty looking. Looks like those covers acted as dirt traps.
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Old 08-11-2014, 12:58 PM   #13
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I'm not easily offended, so feel free to speak up next time!
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Old 08-11-2014, 06:05 PM   #14
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Gotcha. Didn't want to rain your parade, new car and all.
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Old 08-11-2014, 06:45 PM   #15
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Subd. My brothers G8 just got a texas speed cam but needs intake and exhaust.
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Old 08-11-2014, 09:40 PM   #16
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Back in the early days of this forum, GRRRR8 was widely advocated because of politics and control freak stuff on G8Board. So I belong to the former, not the latter.

I've periodically considered taking over my wife's G8, selling one of my Formulas, and getting her an SUV. She's agreeable, but although I've come to really like the car, I still prefer my f-bodies.
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Old 08-12-2014, 05:41 AM   #17
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sub'd
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Old 08-12-2014, 02:48 PM   #18
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Yay, Brendan made a post on LS1tech

Oh, and when did you get stainless works exhaust
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Old 08-13-2014, 11:35 AM   #19
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Got it when i cut ties with an overrated dealership with poor customer service.
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Old 08-17-2014, 10:07 PM   #20
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Nice G8 you have there. I've had mine 6 years and I love it, best car I ever had. I'm also thinking about the Kooks mids, let me know how you like them if you pull the trigger.

I have Solo axlebacks (which are straight pipes) with the factory mid muffler and it sounds good. Kooks long tubes with catted mid pipes would be too loud with the Solo axlebacks since I'd have to eliminate the mid muffler.
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