# Group 3J Improved Production Cars

Group 3J Improved Production Cars is an Australian motor racing category for modified road cars.
The category is defined by Motorsport Australia as being for race vehicles derived from registered production automobiles, with limited modifications to improve performance and reliability. Cars must be mass-produced touring cars, the model of which has been:
* homologated by the FIA in Group A or
* commercially available in Australia as a new car through a manufacturer’s dealer network, with at least 200 examples having been registered for road use in Australia or
* otherwise recognised by MA for Group 3J
Modifications to engines, brakes and suspension are permitted and a different engine, from the same manufacturer as the body shell, may be utilised. Cars may be fitted with wheel arch flares, front air dams and rear deck spoilers.
Improved Production Cars compete in one of four of engine capacity classes:
* 0 – 1600 cc
* 1600 – 2000 cc
* 2000 – 3000 cc
* 3000 – 6000 cc
The Improved Production Racing Association of Australia (IPRA) is recognised by MA as the sole entity representing competitors in the category. State championships are conducted in every Australian State and the Northern Territory and the Australian Improved Production Nationals are held annually on a state rotational basis.
The category was formerly known as 3J Club Cars. The name Group 3J Club Cars was used up to the year 2000, and Group 3J Improved Production Cars from 2001.

## Australian Improved Production Nationals

| Year | Winning driver | Car | Circuit | State | Date |
| 1991 | Terry Lewis | Mazda RX-3 | Winton Raceway | Victoria | |
| 1992 | Phil Morriss | Datsun 1600 | Winton Raceway | Victoria | |
| 1993 | Andrew Brown | Mazda RX-3 | Eastern Creek International Raceway | New South Wales | |
| 1994 | Ken Douglas | Mazda RX-7 | Phillip Island Grand Prix Circuit | Victoria | |
| 1995 | Ken Douglas | Mazda RX-7 | Mallala Motor Sport Park | South Australia | |
| 1996 | Roger Hurd | Holden LX Torana | Baskerville Raceway | Tasmania | |
| 1997 | Roger Hurd | Holden LX Torana | Lakeside International Raceway | Queensland | 30 November |
| 1998 | Noel McFarlane | Mazda RX-3 | Eastern Creek International Raceway | New South Wales | 29 November |
| 1999 | Andrew Brown | Mazda RX-7 | Phillip Island Grand Prix Circuit | Victoria | |
| 2000 | Roger Hurd | Holden LX Torana | Mallala Motor Sport Park | South Australia | 10 September |
| 2001 | Roger Hurd | Holden LX Torana | Symmons Plains International Raceway | Tasmania | 24–25 November |
| 2002 | Ken Douglas | Mazda RX-7 | Queensland Raceway | Queensland | 3 November |
| 2003 | Wayne Wakefield | Mazda 808 | Oran Park Grand Prix Circuit | New South Wales | 31 August |
| 2004 | Ray Hislop | Ford EB Falcon GT | Phillip Island Grand Prix Circuit | Victoria | 2 May |
| 2005 | Adam Allan | Datsun 1200 | Mallala Motor Sport Park | South Australia | 13 November |
| 2006 | Scott Fleming | Mazda RX-7 | Baskerville Raceway | Tasmania | 15 October |
| 2007 | David Loftus | Nissan Skyline R32 | Morgan Park Raceway | Queensland | 30 September |
| 2008 | Justin Keys | Mazda RX-3 | Oran Park Grand Prix Circuit | New South Wales | 9 November |
| 2009 | James Atkinson | Holden VX Commodore | Phillip Island Grand Prix Circuit | Victoria | 22 November |
| 2010 | Kevin Ledger | Subaru Impreza | Barbagallo Raceway | Western Australia | 17 October |
| 2011 | Tony Wallis | Mazda 808 | Mallala Motor Sport Park | South Australia | 20 November |
| 2012 | Ray Hislop | Ford BF Falcon | Baskerville Raceway | Tasmania | 11 November |
| 2013 | Over 2 litre: Ray Hislop Under 2 litre: Bob Jowett | Ford BF Falcon Honda Civic | Morgan Park Raceway | Queensland | 29 September |
| 2014 | Over 2 litre: Kevin Ledger Under 2 litre: Andrew Tendli | Subaru Impreza Honda Civic | Wakefield Park Raceway | New South Wales | 9 November |
| 2015 | Over 2 litre: Ray Hislop Under 2 litre: James McKinnell | Ford BF Falcon Honda Integra | Hidden Valley Raceway | Northern Territory | 12 July |
| 2016 | Over 2 litre: Ray Hislop Under 2 litre: Graeme Cox | Ford BF Falcon Honda Civic | Phillip Island | Victoria | 26–27 November |
| 2017 | Over 2 litre: Ray Hislop Under 2 litre: David Waldon | Ford BF Falcon Mazda RX-3 | Barbagallo Raceway | Western Australia | 21–22 October |
| 2018 | Over 2 litre: Ray Hislop Under 2 litre: David Waldon | Ford BF Falcon Mazda RX-3 | The Bend Motorsport Park | South Australia | 9–11 November |
| 2019 | Ray Hislop | Ford BF Falcon | Baskerville Raceway | Tasmania | 16–17 November |
| 2020 – 2021 | Not held | Not held | Not held | Not held | Not held |
| 2022 | Over 2 litre: Zak Hudson Under 2 litre: Kurt Macready | Mazda RX-7 Nissan Silvia | Morgan Park Raceway | Queensland | 1–2 October |
| 2023 | Over 2 litre: Adam Poole Under 2 litre: Kurt Macready | Holden Monaro Nissan Silvia | Sydney Motorsport Park | New South Wales | 16–18 June |
| 2024 | Over 2 litre: Matt Cherry Under 2 litre: Kurt Macready | Holden Monaro Nissan Silvia | Hidden Valley Raceway | Northern Territory | 19–21 July |
Note: The title was contested as the Club Car Nationals prior to 2001.