He went off at one of the fastest corners and slid into a concrete wall at about 180km/h.
"The first contact bent the steering which sent me sideways across the track into the wall on the opposite side as well," Forster said.
He managed to get the ailing car safely off the track.
He said apart from the damaged steering the major damage was to the panels so the repairs were able to be sorted without too many issues and he was able to get back on the starting grid for last weekend's round.
"It was a pretty good return," he said, adding his concerns about the car's handling in the wake of the big Pukekohe impact soon disappeared as he grabbed the third place and followed it up with the brace of wins.
With two more rounds in the championships to go, at Hampton Downs and Taupo, he is sitting in second place.
"I'm a little way behind first after the Pukekohe crash but I'll be pushing hard at the next two rounds to get back as many points as I can."