Details of Holden Supercars parity rules change revealed

The Holden ZB Commodore has been allowed an extension to the front splitter and a change to the rear wing as part of the latest wave of Supercars parity adjustments

Details of Holden Supercars parity rules change revealed

The updated Holden aero package got a green light from the Supercars Commission last week, with all of the Commodores in the field set to run the new specification at Hidden Valley this weekend.

While Supercars has not publicly released any information regarding the update, Roland Dane, whose Triple Eight squad is the official Holden homologator, has confirmed that the changes affect the back of the front splitter and the maximum angle of the rear wing.

In theory, the car should now produce better front downforce numbers but have a slightly lower maximum rear downforce potential.

"There's a small change to what's called the extension on the back of the front splitter, to make it so that it's uniform with the other two cars in terms of its relationship with the ground," explained Dane.

"It's a very small tweak, it's quite difficult to see if it's measurable, but it's basically bringing all the cars into line in terms of that angle.

"They've got different sized splitter extensions, which hasn't changed, it's just that a subtly of an angle that's been made uniform across the three cars.

"The only other change with that is that the rear wing has had a reduction of one degree, from 19 and a half maximum to 18 and a half."

When asked why the changes were kept secret until teams arrived in Darwin, Dane added: "These things always come out sooner or later. You'd have to ask Supercars.

"To me, there's no point in making anything up around it, it is what it is."

The change is the latest chapter of an ongoing parity saga, which started with a mandated centre of gravity change before the Symmons Plains round that penalised Ford's Mustang significantly more than the Commodore.

More changes followed for the Perth round, with the Mustang forced to reduce its rear wing endplates and alter its front splitter amid concerns over its mid-corner downforce.

Having begrudgingly made its own changes earlier in the season, Tickford Racing boss and Supercars Commission member Tim Edwards said the two Ford teams accepted the Holden updates.

"I sit on the Commission and [DJR Team Penske boss] Ryan Story is also there, so we're involved in the decision-making process," said Edwards.

"With the evidence that was put in front of us, we agreed to the change."

Even with the parity changes, the new Ford has still won 13 of the 14 races held so far this season.

shares
comments
Recovery setback forces Stanaway out of Darwin Supercars round

Previous article

Recovery setback forces Stanaway out of Darwin Supercars round

Next article

Hidden Valley Supercars: Scott McLaughlin cruises to race one win

Hidden Valley Supercars: Scott McLaughlin cruises to race one win
Load comments
The well-travelled racer now Supercars' elder statesman Plus

The well-travelled racer now Supercars' elder statesman

James Courtney has been around the block in his motorsport career it's fair to say. After a single-seater career cut short, he's won everything there is to win in Supercars. Following a rocky ride recently in the Australian category, he's found a happy hunting ground with Tickford Racing, as Andrew van Leeuwen explains

Supercars
Oct 19, 2021
How taming his temper shaped Supercars' slow-burn star Plus

How taming his temper shaped Supercars' slow-burn star

His decision to leave Brad Jones Racing was the biggest shock of the Australian Supercars silly season so far. But for Nick Percat, it comes as the culmination of a personal journey that has made him into one of the most rounded drivers in the series, now in search of a seat that can make him a champion

Supercars
Sep 16, 2021
Why replacing Supercars' GOAT with a teenager is worth the risk for T8 Plus

Why replacing Supercars' GOAT with a teenager is worth the risk for T8

On the face of it, picking an 18-year-old rookie to replace arguably the greatest Supercars driver of all time is a risky move. But as Jamie Whincup takes up a team principal role and hands his car to Broc Feeney, it's one that he is confident will be rewarded in the fullness of time - time which wasn't afforded to Whincup in his early days

Supercars
Aug 31, 2021
How Randle went from fighting cancer to battling for Supercars contention Plus

How Randle went from fighting cancer to battling for Supercars contention

After his fledgling career was paused by a battle with testicular cancer, Thomas Randle then had to wrestle with finding a drive in Supercars after he got the all-clear. It's been a long road for the Melbourne native but, after two lengthy battles, he's finally got a full-time drive to look forward to

Supercars
Jun 25, 2021
How crisis talks over Supercars’ Gen3 future could leave it without a paddle Plus

How crisis talks over Supercars’ Gen3 future could leave it without a paddle

With Supercars’ Gen3 era on the horizon, a shift is set to take place – in more ways than one – but, as has become clear in recent weeks, the plan to bin the stick and use paddles with electronic assisted shift has been met with fierce opposition

Supercars
May 23, 2021
Can DJR still be a Supercars powerhouse after Penske? Plus

Can DJR still be a Supercars powerhouse after Penske?

OPINION: Roger Penske's operation helped lift Dick Johnson's faltering Ford team back to the top of Australian tin-tops. But, despite The Captain's departure, along with star driver Scott McLaughlin, there's no reason to expect an imminent decline from DJR

Supercars
Feb 26, 2021
Why Whincup's next move is no calculated gamble Plus

Why Whincup's next move is no calculated gamble

Supercars' most successful team of the past 15 years is set for a radical shakeup next year when Jamie Whincup retires from driving and takes over the reins at Triple Eight. But the team's outgoing boss Roland Dane has full faith that he'll be up to the task

Supercars
Feb 5, 2021
The top 10 Supercars drivers of 2020 Plus

The top 10 Supercars drivers of 2020

In a year of few constants, the Australian Supercars championship could be relied upon for its usual blend of rough and tumble racing with a V8 soundtrack. But who were its top performers in 2020?

Supercars
Dec 27, 2020