The 2005 Australian GT Championship was an Australian motor racing competition for "closed production based sports cars".[1] It was sanctioned by the Confederation of Australian Motor Sport (CAMS) as a "National Championship".[1]
It was the ninth Australian GT Championship and the first to be held since 1985.[2] CAMS revived the GT Championship after the demise of the Australian Nations Cup Championship at the end of 2004.
The championship was won by Bryce Washington driving a Porsche 911 GT3 Cup.
| Entrant | Car | No. | Driver | Rounds |
|---|---|---|---|---|
| Brennanit | Porsche 996 GT2 R | 3 |  David Stevens | 3 |
| Crickcars.com.au | Dodge Viper GTS ACR | Greg Crick | 5 | |
| Consolidated Chemicals Co. | Ferrari 360 GT | 4 | Ted Hulgin | All |
| Team Lamborghini Australia | Lamborghini Diablo GTR | 5 | Peter Hackett | All |
| 6 | Rusty French | 1 | ||
| Darcy Russell | Dodge Viper GTS ACR | 7 | Darcy Russell | 4 |
| Simon Middleton | Porsche 911 GT3 | 8 | Simon Middleton | 1–4 |
| Geoff Munday | Ford Mustang Cobra R | 10 | Geoff Munday | 4 |
| Don Tryhorn | Porsche 964 Carrera | 11 | Don Tryhorn | All |
| Mark Eddy | Porsche 911 GT3 R | 12 | Mark Eddy | 1, 3–5 |
| Greg Ward Racing | Porsche 911 GT3 Cup Car | 14 | Greg Ward | 1, 3 |
| CAF Nautilus | Porsche 911 GT3 Cup Car | 17 | Rob McMillan | 3 |
| Max Twigg Racing | Porsche 993 RSR | 18 | Max Twigg | 2–4 |
| Team Mongrel | Honda NSX | 20 | Ian Palmer | All |
| CGA Bryson Developments | Ferrari 360 Challenge | 25 | Neil Bryson | 2–5 |
| Paul Stuart | Porsche 993 RSR | 27 | Paul Stuart | 1 |
| Claudie Giorgi | Porsche 911 GT3 | 29 | Claudie Giorgi | 1–3 |
| Lynn's Building Materials | Porsche 911 GT3 | 32 | Malcolm Lynn | 2–5 |
| Anthony R Moodie | Porsche 911 Carrera | 37 | Anthony R Moodie | 1, 4 |
| Porsche 993 RSCS | 38 | Matthew Jones | 4 | |
| Sedgman Pty Ltd | Porsche 911 GT3 | 40 | Russell Kempnich | 2, 4 |
| Song Zu | Porsche 993 RSCS | 41 | Matt Humphreys | 2–3 |
| Travelplan Ski Holidays | Porsche 911 GT3 | 46 | Anthony Skinner | 3 |
| Wiffens Fruit & Veg | Porsche 993 RSCS | 48 | David Giugni | 3, 5 |
| Trevor John | Porsche 944 Turbo | 49 | Trevor John | 1, 3–4 |
| Bryce Washington | Porsche 911 GT3 Cup Car | 54 | Bryce Washington | All |
| Dean Savage | Ferrari 360 Challenge | 57 | Dean Savage | 2 |
| Kevin Miller | Porsche 911 GT3 | 58 | Kevin Miller | 4 |
| Garth Rainsbury | Porsche 911 GT3 | Garth Rainsbury | 1, 4 | |
| Speed Energy Drinks | Ferrari 360 Challenge | 66 | Ross Lilley | 5 |
| J.K Burke | Porsche 911 GT3 | 68 | Kim Burke | 3 |
| John Kaias | Porsche 911 GT3 | 77 | John Kaias | All |
| Assetval P/L | Porsche 911 GT3 RS | 81 | Phillip Holzberger | 2 |
| John Teulan | Ferrari 360 Challenge | 88 | John Teulan | 1–4 |
The title was contested over a five-round series with three races per round.[3]
| Round | Circuit | State | Date | Round winner | Car | |
| 1 | Phillip Island | Victoria | 21–22 May | Peter Hackett | Lamborghini Diablo GTR | |
| 2 | Queensland Raceway | Queensland | 2–3 July | Ian Palmer | Honda NSX | |
| 3 | Eastern Creek | New South Wales | 22–24 July | Peter Hackett | Lamborghini Diablo GTR | |
| 4 | Phillip Island | Victoria | 20–21 August | Peter Hackett | Lamborghini Diablo GTR | |
| 5 | Wakefield Park | New South Wales | 12–13 November | Greg Crick | Dodge Viper GTS ACR |
Championship points were awarded on a 38-32-28-25-23-21-19-18-17-16-15-14-13-12-11-10-9-8-7-6-5-4-3-2-1 basis to the first 25 classified finishers in each race.[1] An additional 3 points were awarded to the fastest qualifier at each round.[1]
| Position | Driver | No.[4] | Car | Entrant | Phi | Que | Eas | Phi | Wak | Total | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Bryce Washington | 54 | Porsche 911 GT3 Cup | Adrad Radiators | 92 | 70 | 99 | 99 | 102 | 462 | |
| 2 | Peter Hackett | 5 | Lamborghini Diablo GTR | Team Lamborghini Australia | 117 | 79 | 114 | 104 | - | 414 | |
| 3 | Ian Palmer | 20 | Honda NSX | Instant Foundation | 28 | 87 | 84 | 78 | - | 277 | |
| 4 | John Teulan | 88 | Ferrari 360 Challenge | Industry Central - Stahlwille | 69 | 77 | 73 | 44 | - | 263 | |
| 5 | Neil Bryson | 25 | Ferrari 360 Challenge | CGA Bryson Developments | - | 71 | 63 | 76 | - | 210 | |
| 6 | Claude Giorgi | 27 | Porsche 996 GT3 | Claude Giorgi | 61 | 71 | 69 | - | - | 201 | |
| 7 | Ted Huglin | 4 | Ferrari 360 GT | Consolidated Chemicals Co | 36 | 59 | 59 | - | - | 154 | |
| 8 | Greg Crick | 3 | Dodge Viper GTS ACR | Crickcars.Com.Au | - | - | - | - | 111 | 111 | |
| 9 | Dean Savage | 57 | Ferrari 360 Challenge | Dean Savage | 42 | 47 | - | - | - | 89 | |
| 10 | Mark Eddy | 12 | Porsche 996 GT3 R | Mark Eddy | 78 | - | - | - | - | 78 | |
| 11 | Geoff Munday | 10 | Ford Mustang Cobra RA | Jim Beam Racing | - | 18 | - | 58 | - | 76 | |
| 12 | Ross Lilley | 66 | Ferrari 360 Challenge | Speed Energy Drinks | - | - | - | - | 65 | 65 | |
| 13 | Garth Rainsbury | 66 | Ferrari 360 Challenge | Garth Rainsbury | - | - | - | 63 | - | 63 | |
| 14 | Rusty French | 6 | Lamborghini Diablo GTR | Team Lamborghini Australia | 55 | - | - | - | - | 55 | |
| 15 | D'Arcy Russell | 7 | Dodge Viper GTS ACR | D'Arcy Russell | - | - | - | 38 | - | 38 |
The Australian Porsche Drivers Challenge, which was run concurrently with the Australian GT Championship, was won by Bryce Washington.[3]