The Ultimate Pontiac G8 -- Just add a 7.0 LS7 Z06 engine - Pontiac G8 Forum: G8 Forums - G8Board.com
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post #1 of 23 (permalink) Old 12-18-2007, 01:36 PM Thread Starter
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The Ultimate Pontiac G8 -- Just add a 7.0 LS7 Z06 engine

http://www.motortrend.com/features/p...gts/index.html

My, how the badges lie. To anyone else on the road, this black Holden Commodore is a regular HSV GTS, the 6.0-liter V-8 sport sedan built by GM's Australian hot-shop, Holden Special Vehicles (HSV). With its 20-inch wheels, big brakes, and tied-down suspension, the HSV GTS previews the 425-hp Pontiac G8 GXP we'll see here sometime in late 2008.

Under the hood, though, is a little secret -- a 7.0-liter, 505-hp LS7 V-8 lifted straight out of the Corvette Z06. Yup, it basically bolts right in. And it's taken an outsider to do the operation many Aussie musclecar enthusiasts have been waiting for GM to perform. The work has been done by Corsa Specialized Vehicles (CSV) in Melbourne, Australia, a tuner with no small amount of experience in turning out some wicked Commodore-based projectiles over the last 15 years or so.

We've driven the car: Run it down the drag strip, through peak-hour traffic and out in the country, so can attest that the engineering, the finish and most of all the performance work beautifully. All it needs now is a new badge.



It's worth cutting straight to the chase and talking about acceleration. There's a six-speed automatic involved but experience on the road suggests that, even with a rubbered-up track surface, traction off the line won't just be difficult, it'll be virtually non-existent. Chevrolet's figures show the LS7 grunts out 470lb-ft, but this example, with a better intake and exhaust system, is certainly producing even more, so what chance do a pair of standard, 20-inch Bridgestones have when that lot is unleashed in anger?

Holden's traction and stability control is left to sort it out. Load up the torque converter, then... wham! The GTS stutters a bit on the software, then hooks up and catapults down the track. Manual shifting the 6L80E transmission seems to work best, but there's a few seconds of head scratching when the first-to-second gearshift hits the rev-limiter as the shift software finds it difficult to match the rapid escalation in revs. The answer is to leave it in Drive for that first shift, then change gates for manual shifting into third and fourth, using about 6500 of the available 7200rpm. Work that lot out, and each run is as repeatable and trouble free as the last.



The results? Pretty spectacular, for a sedan less than half the price of equivalent muscle from Germany. The 0-62mph time is 4.89 seconds; the standing 400 meters (14ft short of a quarter mile) takes 12.90 seconds at a terminal speed of 116.2 mph. But then there are a couple of other numbers to consider. The standing 125 mph -- a speed few cars are able to reach in less than 500 meters -- comes up in just 14.7 seconds, and the 7.0-liter GTS is still hauling hard. But then there's the elasticity afforded by all that torque, too. In third gear, the 50-75 mph overtaking increment is demolished in 3.2 seconds, but in sixth (the auto's manual shift mode allows no kick-down) the same speed range is covered in just 7.3 seconds.


I buy cats, dead or alive...
http://www.ls1tech.com/forums/showthread.php?t=712994
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post #2 of 23 (permalink) Old 12-18-2007, 03:59 PM
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CSV did this ......... it really means nothing for us at all. CSV is not a OEM level company like HSV.
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post #3 of 23 (permalink) Old 12-18-2007, 08:10 PM
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Fun but 4.9s 0-60? Meh. That engine is capable of much more in this car. They need to get real tires on it and at least get the traction control and shifting sorted out.
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post #4 of 23 (permalink) Old 12-18-2007, 08:43 PM
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Originally Posted by CTS-V View Post
Fun but 4.9s 0-60? Meh. That engine is capable of much more in this car. They need to get real tires on it and at least get the traction control and shifting sorted out.

i agree, with that motor, tuned right and with a good driver i would expect low 12's, and keeping traps close to 120 but not over bc of weight. just prediction, but i dont think im far off. great car non the less!

chrish

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post #5 of 23 (permalink) Old 12-19-2007, 06:34 PM
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They should have put the 6 speed manual instead of the auto. I heard some super charged LS2 VXR8's on you tube. They sound amazing. XD
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post #6 of 23 (permalink) Old 12-19-2007, 08:41 PM
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i agree, with that motor, tuned right and with a good driver i would expect low 12's, and keeping traps close to 120 but not over bc of weight. just prediction, but i dont think im far off. great car non the less!

chrish

What he said. I was expecting about 12.2-12.4 in the quarter.

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post #7 of 23 (permalink) Old 12-20-2007, 10:22 AM
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Originally Posted by OLD_GOAT View Post
What he said. I was expecting about 12.2-12.4 in the quarter.
Keep in mind though, the LS7 was purely designed to go into a 3200 pound Corvette, not a 4000 pound sedan. It's geared and tuned for a lightweight car. You'd need to change ratios and modify the tune to boost power in the low end for a heavier car to get similar results.
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post #8 of 23 (permalink) Old 12-20-2007, 07:10 PM
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Do you mean maybe cammed for a lighter car? I do not think they changed the trans or diff so the gearing should be fine for the car. Sure enough though to be best optimized for the extra weight you'd want a different cam profile and ECU tune.

Even so it should do better than this just with correct tires. The fact that it has trouble hooking up says the gearing is not too far off (it would bog if the gearing were set for a lighter car), it just needs enough tire to match the huge hp and torque bump.

Last edited by CTS-V; 12-21-2007 at 02:01 PM.
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post #9 of 23 (permalink) Old 12-20-2007, 10:16 PM
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why would the general put the soon to be obsolete LS7 in a upcoming car. i believe that last production of the ls7 would be 09/10. i honestly believe this

G8v6= 3.6 DOCH 2xx?= Camaro
G8GT = L76 362 hp = Z28
G8GXP = LS3 425??= SS

the LS9 S/C = 620 will only be available on the ZR1

Last edited by RaptorGXP; 12-21-2007 at 04:20 PM.
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post #10 of 23 (permalink) Old 12-21-2007, 12:37 AM
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Awesome article. Thanks.

As cool as it would be to do an engine swap to put the LS7 in a G8 GXP, it'll be a lot cheaper modifying the LS3 or whatever comes in the GXP.
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post #11 of 23 (permalink) Old 12-21-2007, 07:29 AM
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Can't wait to see who first gets hold of teh new LS9, 6.2 liters will bolt right in, 620 hp will pin you to the back seat upon takeoff.!
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post #12 of 23 (permalink) Old 12-21-2007, 08:41 AM
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Can't wait to see who first gets hold of teh new LS9, 6.2 liters will bolt right in, 620 hp will pin you to the back seat upon takeoff.!
I don't know how easy that one will bolt right in. It's a little taller and uses 2 different fuel maps...one for low RPM and one for high RPM. It didn't sound like it would be too easy.

With the LS7 costing around $17k (I think that is what the article said), I can't imagine what the LS9 would set a person back.
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post #13 of 23 (permalink) Old 12-21-2007, 02:02 PM
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I bet an LSA SC would be cheaper.
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post #14 of 23 (permalink) Old 12-21-2007, 03:17 PM
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They should have put the 6 speed manual instead of the auto. I heard some super charged LS2 VXR8's on you tube. They sound amazing. XD

Linky, linky please.
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post #15 of 23 (permalink) Old 12-21-2007, 04:33 PM
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post #16 of 23 (permalink) Old 12-30-2007, 03:01 PM
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Originally Posted by GregKJ View Post
Awesome article. Thanks.

As cool as it would be to do an engine swap to put the LS7 in a G8 GXP, it'll be a lot cheaper modifying the LS3 or whatever comes in the GXP.
Yea, but the sound of the LS7 is like no other.
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post #17 of 23 (permalink) Old 12-30-2007, 04:36 PM
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This article first appeared in the Australian magazine "Wheels". The times were recorded by their normal test drivers who while very capable, are more akin to putting Camrys and Kias through their paces. It probably also includes some rounding from the conversion from metric. I will check my copy and see if the numbers are accurate.

CSV (Corsa Specialized Vehicles http://www.csvaustralia.com/ ) are a tuning company in Melbourne who tried to complete with HSV but failed, so became a specialist tuner.
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post #18 of 23 (permalink) Old 09-30-2016, 10:55 AM
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If you ever wondered what the GXP refresh could have been:

HSV Planning LS9-Powered Swan Song for Commodore - Motor Trend
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post #19 of 23 (permalink) Old 09-30-2016, 12:06 PM
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Originally Posted by G8>550i View Post
If you ever wondered what the GXP refresh could have been:

HSV Planning LS9-Powered Swan Song for Commodore - Motor Trend
Damn I've been wondering about this since I was 16 years old back in 2007.. when this thread was made

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post #20 of 23 (permalink) Old 09-30-2016, 12:18 PM
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If it's auto = 2.9 rear end?

If so, that's probably too tall for a really quick 0-62 time
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