• May 12, 2008
Click above for a gallery of the turbocharged APS HSV Commodore.

APS is in the business of making power and that's exactly what they've done for the new Pontiac G8 GT and its Aussie-spec sibling, the Holden Commodore HSV. The tuner's Stealth Intercooled turbocharger setup uses two water-cooled turbos mounted deep into the engine bay, just ahead of the transmission, to ensure underhood temps are kept in check – road debris be damned. According to APS, the system is a straightforward, bolt-in affair, utilizing a right-sized, aluminum, air-to-air intercooler, seven pounds of boost and a pair of TIAL 38mm external wastegates to bleed off exhaust gases and optimize throttle response. While APS hasn't installed the system on a Pontiac G8 GT yet, they've strapped its own blown HSV (with a three-inch cat-back exhaust) onto the rollers of a Dyno Dynamics dyno and produced 557 hp and 583 lb.-ft. of torque while running 93-octane. Pricing hasn't been announced yet, but considering how impressed we were with the standard G8 GT, this setup has the potential to redefine the bang-for-the-buck quotient in the segment.



[Source: APS via FreshTarmac]


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  • 24 Comments
      • 6 Years Ago
      The HSV is the Vauxhall VXR
      • 6 Years Ago
      Such an odd location for the turbos. I can only imagine all the grit and grime that would bulid up around those turbos if you don't spray the underside of the car on a daily basis.
      • 6 Years Ago
      Impressive numbers! But the G8 still looks bland/boring... I rather have the HSV
        • 6 Years Ago
        No, the Vauxhall VXR8 Looks better. That's my opinion.
      • 6 Years Ago
      APS has always done good work. They were one of the few tuners to support the GTO network during its inception and even to this day. Thats particularly good considering they're half a world away.
      • 6 Years Ago
      I like the G8, but i'm really not all that impressed with the power output with twins on it.
      03/04 cobras with twin turbos would make short work of that.

        • 6 Years Ago
        Squeezing every last pony from an engine may be for some, but certainly not everyone. Drivability and using pump gas is important too.
        • 6 Years Ago
        I just checked their website. The turbos they're using are rated at 50lbs/min @18psi of boost, each.

        That dyno chart is the system only pushing 7psi, and probably about 30lbs/min of airflow per turbo. There's a LOT more power to be had. It'd probably be advisable to build the motor though :)
      • 6 Years Ago
      GXP + Twin Turbo = laughing at M5s on the autobahn as I drive by...with a setup like this, I won't have to worry about shelling out 60k for a CTS-V to enjoy beating a BMW.
        • 6 Years Ago
        I think some people need to do better research. This bolt-in TT setups are all old news (in Aus).

        For the best info on Holden VE (Pontiac G8) and HSV E-Series (Vauxhall VXR8/Pontiac GXP) check out http://www.ls1.com.au.

        This forum is the number 1 source for anything Holden and HSV (Hence G8, GXP and VXR8). If you check out the sponsors area you will notice many of the them already supply or have installed thoroughly tested CAIs, OTRs, single turbo, twin turbo, and superchargers for all the Holden and HSV V8s (and some V6s). If you check out the members rides you will be able to see first hand what the real life applications of these mods produce.

        My pick of the bunch is this HSV R8 TT from Marranos (pictures aplenty): http://www.ls1.com.au/forum/showthread.php?t=71011
      • 6 Years Ago
      This wouldn't be the GT, it would be the GXP. Either way, it would be a hell of a lot of fun.
      • 6 Years Ago
      With 557 HP this puts the G8/HSV in the M5 category of performance (M5 has 500 hp for those too lazy to look it up)

      Ooop there I go again, getting snookered into GM's clever marketing ploy.
        • 6 Years Ago
        The m5 straight line would be obliterated by this....It has more then 200hp extra and 300ft/lb
        • 6 Years Ago
        Uh, how is 557 200 more "then" 500? Something doesn't add up.
        • 6 Years Ago
        lets say 20% drive train loss cause its easy and generally accepted.

        557x0.2=110(estimate)----> 557+110=667hp

        667hp(g8)-500hp(m5)= 167hp. Sorry!
      • 6 Years Ago
      yeah this will only be like $15000

      they build really nice stuff. go check out the kit for the 350Z
      Carlos
      • 6 Years Ago
      I'd like to see APS come out with a twin turbo system for the V6 powered G8. I'd be more interested in that.
      • 6 Years Ago
      not bad, fairly impressive
      • 6 Years Ago
      7 lbs of boost? Call me when it hits 10. They'll have to lower the compression a bit to do so, but that's okay.
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