The winner of the rally that cost the life of Peter Brock says the Australian motor sport legend's death may prompt a change in the way such road races are run.

Veteran racer Ross Dunkerton won the three-day Targa West rally near Perth, which on Friday claimed Brock's life.

The motor racing legend lost control of his car and slammed into a gum tree on a section of bush road he had not had a chance to inspect beforehand.

Several motor sport figures have called for an end to tarmac rallies run on closed off roads, saying they are too dangerous.

Mr Dunkerton believes fatigue and lack of preparation may have played a part in the fatal accident because Brock had only flown into Perth on the eve of the race and did not have time to do a preliminary drive of the route.

"That particular road I'd been on over 10 times," Dunkerton told ABC Radio.

"Peter really didn't do enough reconnaissance, he was too tired.

"I think probably one thing that will come out of this is that competitors will not be allowed to compete unless they have done reconnaissance."

Dunkerton said the stretch of road where Brock died was "quite tricky" and he had taken note of the potential dangers there, particularly if it was wet.

The Confederation of Australian Motor Sport (CAMS) president Colin Osborne said CAMS was reviewing the rally incident.

But Mr Osborne would not speculate on the outcome.

"I clearly have a healthy respect for Ross's opinions and his achievements," Mr Osborne said.

"But it would be inappropriate for me to speculate about the outcome of a review at this point."

A West Australian police spokesman said an autopsy was carried out on Monday on Brock's body, which was expected to be released so his family could take him back to Victoria.

"I do believe that he will either go tonight or tomorrow," the spokesman said.

Brock's publicist Tim Pemberton said the racing star could be honoured with a public memorial service, possibly at Sandown Raceway, the scene of many of his most famous victories.

"Sandown is a possibility, we will know tomorrow, there are all sorts of options," Mr Pemberton told AAP.

Brock's family had yet to make a decision on the Victorian government's offer of a state funeral, he said.

They wanted both a private and a public recognition service, he said.

Police retrieved a "black box" from the wreckage of Brock's Daytona Coupe to find out why it slammed into a tree killing him and injuring his co-driver, Mick Hone.

The box will be sent to Victoria where its data - including speed, braking and steering - will be audited for the WA police probe.

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