: I'm a mechanic, not a lawyer!!!
I offer this as general advice to my friends on this forum.
Consult your relevant state authorities for legal advice.
Originally Posted by photojeep
Qld is currently chasing modified 4wd's
Best to make sure your 4wd is within the legal specs. Some reasonable info from member at 4x4earth:
The following information provides some general guidance about raising a vehicle’s height
A vehicle lift up to and including 75mm combining both suspension lift and tyre diameter increase (maximum suspension lift 50mm, maximum tyre diameter increase 50mm) is acceptable under self-certification.
A vehicle lift between 76mm and 125mm inclusive, combining a suspension lift, a tyre diameter increase and a body lift (maximum suspension lift 50mm, maximum tyre diameter increase 50mm, maximum body lift 50mm) requires certification and testing by an Approved Person.
A suspension lift up to and including 50mm is acceptable under self-certification. A vehicle lift over 50 mm or due to a combination of any other lift (tyres, or body blocks) requires certification and testing by an Approved Person.
Please Note: The above mentioned maximum tyre diameter tyre increase is for 4WD off-road vehicles. A passenger car or passenger car derivatives must not increase their tyre diameter by more than 15mm.
General guidance is great, if you want the in's and out's read on ...
Australia Design Rules (ADR's) are enforceable by State Registration Authorities.
As this thread started with Electronic Stability Controls (ESC) we are referring to ADR 88/00.
A guide to modifications is titled National Code of Practice. (NCOP)
In Qld the guide to modifying our vehicles comes under Vehicle Standards Bulletins. (VSB)
VSB's are also enforceable by state authorities.
I have just downloaded VSB14 on 08/09/2018 to ensure I was reading the current rules.
The timestamp indicates VSB14 has not been modified since November 2015.
This is obviously a crock of shit because ADR 88/00 was enacted 25th August 2017,
by the Minister for Urban Infrastructure = Paul Fletcher
Just to highlight the insanity of all this, ADR 88/00 complies with;
United Nations paragraph 7.7 of UN R 140/00, and Annexes 3 to 5 of UN R 140/00.
Yes folks, it goes all the way to the UN
When any modification is made to a vehicle with ESC,
it needs to be re-evaluated, under specific conditions,
as laid out in ADR 88/00. Read it at your peril.
"7.3. The lateral displacement of the vehicle centre of gravity with respect to
its initial straight path shall be at least 1.83 m for vehicles with a GVM of
3,500 kg or less, and 1.52 m for vehicles with a maximum mass greater than
3,500 kg when computed 1.07 seconds after the Beginning of Steer (BOS).
BOS is defined in paragraph 9.11.6."
Back to our issue.
photojeep's quote is correct for Australia, not just Qld.
Any vehicle with ESC can only be raised 50mm under NCOP.
It does not matter where this 50mm comes from.
It can be a combination of either; suspension, tyres, or body lift.
A lift of between 50 to 150mm needs to be certified by an authorised person under LS7 of the NCOP.
And the only people who can certify according to LS7 are the Original Manufacturers or
engineers with a ton of software and sensors who can test according to ADR 88/00.
And perform tests as required in Example 7.3
None of this was an issue until 25th August 2017 !!
So the general rule of thumb about three inches of lift only applies to vehicles without ESC.
What this means to me is my lift kit and tyre size mods will need to be reassessed due to the stroke of a pen.
All because some bureaucrat in Canberra hates modified vehicles