Monday, Jul 25, 2011 at 16:39
vehicles standardsrta modifcation standards compliance pages
this is direct from the pdf:
Suspension
Besides assuring a comfortable ride, a vehicle’s
suspension system controls wheel movement for handling and road
holding. Manufacturers conduct extensive
test programs to develop suitable
suspension settings. Adjustments, such
as lowering the vehicle, can upset the
suspension characteristics and cause unpredictable handling. Generally, roll
stabilizer bars, axle locating rods, upgraded shock absorbers or upgraded springs may be used provided they are
suitable for the vehicle and are properly fitted. However, the following
suspension modifications are not acceptable:
?? Welding forged components such as stub axles or control arms.
?? Fitting longer, non-standard shackles to leaf springs.
?? Fitting any additional components or altering the
suspension so that the wheels or tyres may contact any
component under the full range of
suspension and steering travel.
?? Fitting any additional components or altering the
suspension ride height so that any part of the vehicle other
than a wheel or tyre can contact the road in the event of a tyre deflation.
If major changes to the
suspension (such as substitution of a non standard front cross member) are carried out, they
should be done under the strict guidance of an engineering signatory.
Vehicle standards information / No. 6 / Rev. 2.1 / Published 1 November 2007 4
Wheels and tyres
Refer to VSI No.9 Guidelines for alternative wheels and tyres.
Steering
As with
suspension systems, a vehicle’s steering system is vital for safety and vehicle manufacturers make considerable
efforts to develop suitable steering geometry. Where any non standard part is used, owners are advised to seek the
assistance of an engineering signatory to assess the structural integrity of the steering system and the adequacy of the
steering geometry under all conditions of steering and
suspension movement.
Steering components are fundamental to vehicle safety. Always avoid cutting, welding (or otherwise hot working) any
forged steering components such as pitman arms, drag links or steering knuckles.
Where ADRs 10A, 10B, 10/00 or 10/01 apply, the vehicle’s steering column and steering wheel are designed to
minimise injury to the driver during a crash. In the case of replacement steering wheels (including aftermarket steering
wheels fitted with airbags), owners should seek assurance from the supplier or an engineering signatory that the
vehicle continues to comply with these requirements.
The diameter of the steering wheel affects the driver’s control of the vehicle. A reduction in the steering wheel
diameter will result in increased steering effort and ‘kick back’ from road bumps.
Vehicle Standards Bulletin No. 4 issued by the Department of Transport & Regional
Services (DOTARS) covers
conversion requirements for left hand to right hand drive. This publication is available from DOTARS, PO Box 594,
Canberra ACT 2601, T (02) 6274 7111.
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