Filed under: Aftermarket, Tuners, Sedans/Saloons, Pontiac, Holden, HSV
APS builds 557 hp twin-turbo setup for Pontiac G8 GT
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.
Gallery: First Drive: Pontiac G8
[Source: APS via FreshTarmac]
Reader Comments (Page 1 of 2)
rouse42 2:40PM (5/12/2008)
yeah this will only be like $15000
they build really nice stuff. go check out the kit for the 350Z
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The Mac Junkie 2:40PM (5/12/2008)
Impressive numbers! But the G8 still looks bland/boring... I rather have the HSV
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Larico Brown 3:13PM (5/12/2008)
No, the Vauxhall VXR8 Looks better. That's my opinion.
chris 8:09PM (5/12/2008)
Larico Brownm, you do realise the VXR8 is simply a Clubsport R8 with different badges yes? It looks identical...
Yar 2:42PM (5/12/2008)
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.
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Josiah 2:53PM (5/12/2008)
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.
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pmiddle5 3:11PM (5/12/2008)
The m5 straight line would be obliterated by this....It has more then 200hp extra and 300ft/lb
Val 5:16PM (5/12/2008)
Uh, how is 557 200 more "then" 500? Something doesn't add up.
pmiddle5 5:58PM (5/12/2008)
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!
bakka 2:55PM (5/12/2008)
BBRRRRRRRRRRRRRAAAAAAAAAAAAATTTTTTT
BBBBBBLLLLLLLLLAAAAATATTTTTTTAATATATA
RRRRRRRRRRRRAAAAAAAAAA
I just outran a Bug!
I want one of these kits for my G8.
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nashchevy 4:57PM (6/11/2008)
I don't think this kit could be for the GT, perhaps the GTP. The HSV Commodore has an ls3 v8 with no cylinder deactivation. The G8 GT has "active fuel management". I haven't seen anyone do any forced induction with these motors.
Paul 2:58PM (5/12/2008)
not bad, fairly impressive
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Garythepowers 3:11PM (5/12/2008)
Imagine a kit like this on the G8 GXP. Hello, 600hp Pontiac!
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jcar302 3:12PM (5/12/2008)
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.
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spdracerut 3:42PM (5/12/2008)
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 :)
Guenther 3:52PM (5/12/2008)
Squeezing every last pony from an engine may be for some, but certainly not everyone. Drivability and using pump gas is important too.
Nick 3:23PM (5/12/2008)
This wouldn't be the GT, it would be the GXP. Either way, it would be a hell of a lot of fun.
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Carlos 3:25PM (5/12/2008)
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.
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danms6 3:37PM (5/12/2008)
Honestly, you'd probably be the only person interested in that. The GT V8 puts out 100+ hp over the V6 for a couple grand extra and is a much better engine overall. Anyone who plans on building up a G8 on this scale is going to start with the V8 in the first place.
why not the LS2LS7? 3:42PM (5/12/2008)
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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