GM Zeta platform
|GM Zeta platform|
|Also called||Global RWD Architecture|
|Body and chassis|
|Body style(s)||2-door coupe
2-door coupé utility
5-door Station wagon
|Predecessor||GM V platform (RWD)
GM F platform (for the Chevrolet Camaro)
Zeta was the original name for General Motors' full-size rear-wheel drive automobile platform. The architecture was engineered by Holden of Australia and was most recently referred to as the "Global RWD Architecture". The GM Zeta replaced the Australian V-body and was considered as the replacement for the North American W, H, and K platforms, but ultimately not used. Although the future of the Zeta program was in doubt during GM's financial troubles, as of May 21, 2009, development of a new form of the Zeta chassis, said to be lighter and more economical has begun, intended to replace existing Australian-produced models.  The Chevrolet Camaro, Pontiac G8 in North America (Canada), Vauxhall VXR8 in United Kindom and the Buick Park Avenue (China) which is based on the Holden WM Statesman/Caprice in Australia are the only Zeta platform models to go into production outside of Australia all other Zeta platform vehicles are manufactured in Australia by Holden.
Development was started in late 1999 by Holden of Australia in order to replace the aging V-body platform underpinning their Commodore VT-VZ platform after sister division Opel announced that the Opel Omega (on which the Commodore was based) would be discontinued. Principal development on the VE Commodore was completed by July 2004 at a cost approaching A$1 billion and the first testing mules underwent trials later that year. General Motors global corporate headquarters took notice of the VE design and began studies on the utilization of the underlying architecture (internally christened Zeta by GM engineers) for a range of future products on a global scale. The idea of Zeta as a global platform was officially revived when GM announced the future Camaro would use the Zeta platform.
The Zeta architecture is very flexible and can accommodate a wide variety of automotive design features such as wheelbase length, ride height, windshield rake and roof line. Zeta's suspension system is all wheel independent and utilizes a MacPherson strut coupled with a dual ball joint lower A-arm for the front and a four link independent setup for the rear wheels. The engine is mounted slightly behind the front axle giving improved weight distribution.
As of May 2009, development of a new form of the Zeta chassis has begun, said to be lighter and more economical and intended to replace existing Australian-produced models. GM imported the long wheelbase Zeta to North America as the Chevrolet Caprice Police vehicle in 2011. GM confirmed May 2012 that will be a "SS" performance model for civilians based on the Holden VF Commodore with it making its debut in the 2013 Daytona Shootout with the VF Commodore going on sale the same day in Australia. It will be made in a limited production. There are rumors of Buick and Cadillac flagship sedans being based on the platform.
Current vehicles using this platform:
- 2006-2013 Holden VE Commodore / 2006-2013 HSV E Series / 2007-2013 Vauxhall VXR8 / 2007-2011 Chevrolet Lumina / 2008-2009 Pontiac G8 / 2006 (2010) Chevrolet Omega
- 2006-2013 Holden WM Statesman/Caprice 2014–Present Holden WN Caprice/2007-2012 Bitter Vero/ 2007-Present Chevrolet Caprice / 2008-2010 Daewoo Veritas / 2007-Present Buick Park Avenue / 2006-2013 HSV E-Series Grange/ 2014-Present HSV F-Series Grange
- 2007–Present Holden Ute
- 2010–Present Chevrolet Camaro
- 2011–Present Chevrolet Caprice PPV police vehicle
- 2013–Present Holden VF Commodore / Chevrolet SS / HSV F Series
- "Camaro tops GM's rwd list; Buick Velite concept, Pontiac GTO and Impala also possibilities". AutoWeek. Retrieved January 16, 2006.
- "Moving Up? Impala goes back to rwd in '09". AutoWeek. Retrieved November 14, 2006.
- "GM to Build New Car Based on Zeta Platform". Detroit Free Press (via Automotive Blogs). Retrieved December 10, 2006.
- "It's official: Pontiac GTO will return!". Leftlanenews.
- "Holden cutbacks: Holden cuts design and engineering jobs as GM abandons global RWD projects". GoAutoNews Issue 449. 2008-09-03.