“I’m not going to comment on what we were or weren’t running,” he told Supercars.com.
“Everyone seems to be focusing on the engine, but there’s plenty of other developments going on with our car, because you need to be able to brake late, you need to be able to get the power down well.
“If anything, probably the thing that really helped us was the ability to put the power down out of Turn 4 and Turn 11 was really strong.
“And that’s got nothing to do with how many mumbos you’ve got under the bonnet, that’s how well the car’s dialled in from a suspension point of view.
“If you have to have a strength, you would say it’s the ability to get off that last corner and the charge down the straight.”
Prodrive scored its maiden title with Winterbottom in 2015, but has won just five races since as the battle between the Red Bull Holden Racing Team and Shell V-Power Racing has taken centre stage.
Edwards said the team would be “super-aggressive” with its development program, but acknowledged it had learnt from being too ambitious with changes during the Hidden Valley round in June.
“We’re constantly developing the cars and it doesn’t always go to plan,” Edwards said.
“In Darwin this year we had a bit of a shocker, because we’re always putting new bits on the car, but we kind of overcooked it a bit there and put too many new bits on the car and it didn’t work, especially on the Sunday.
“It’s a constant balancing act. We don’t want to be chasing, we want to be winning, like we were at Sandown, we’re prepared to be super-aggressive with everything we do.
“There’s a whole host of areas on the car we’re looking to develop and are developing. And that’s the only way we’re going to stand on the top step more regularly.”