I just spoke to my engineer today who is doing my bike
This is in NSW
He advised me that the adjustable coil overs are okay if they are made for that model car and that they can meet the manufacturers minimum recommended height level between center of wheel to top of wheel lip arch apex
so for example if in the Mr2 it is a factory distance of 355mm standard and they say it should not go lower than 330 that means the coil overs must be able to be set at a height of 330 -- they can be able to be set lower for racing but then the onus is on you to raise it up for street level
adjustable tops are not an issue
this is my bike it has no rear suspension
ADR’s and Suspension Modification This information has been extracted from the NSW RTA Code of Practice for Light Vehicle Modifications. Lovells Copy No. 753 - issued 1996. Requirements vary from state to state.
2.4.1. Precedence of ADRs and manufacturer's guidelinesIt is important to note that the requirements of the ADRs and the original manufacturer's modification guidelines take precedence over the Code of Practice. Persons modifying or certifying modifications to light vehicles must ensure that any relevant manufacturer's recommendations are complied with and that no ADR compliance is invalidated, even as an unintended result of complying with the Code of Practice.
Vehicles Manufactured:- 1934 - 31/12/1960:
- These vehicles are not covered by regulation.
- 1/1/1961 - to introduction of ADR 13 - Introduced 1973 - 9/1991
- Minimum Head Light Height: 600 mm.
- Maximum Head Light Height: 1400 mm
- 10/91 - to date:
- Minimum Head Light Height: 500 mm
- Maximum Head Light Height: 1200 mm
***Measurements taken from the ground to the centre of the headlight***
3.5.2 Certification of suspension modifications Certification of suspension modifications shall be treated as follows:
Minor modifications can be treated as owner certified. These are modifications which do not affect the basic geometry or load carrying members of the suspension. Examples are:
- additional or uprated anti roll bars;
- uprated shock absorbers and/or springs;
- altered vehicle ride height by no more than one third of the manufacturers suspension travel in the direction of the ride height change; fitting of suspension assemblies which were options from the original manufacturer for the particular make/model.
Major modifications are to be certified by an engineering signatory. These are modifications to suspension components, systems or installations which affect the major load carrying components of the suspension and which were not options available from the original manufacturer for the particular make/model, Examples are:
- replacement of the original suspension (front or rear) with a system of a different design eg: from another model vehicle;
- changes to suspension components such as changing the front cross member to accommodate an engine change;
- substantially altering the mass of the vehicle.
3.5.3 Australian Design Rules While no ADR is involved directly with suspension systems, the following are examples of ADRs which may be affected indirectly by a suspension modification:
- ADR 7/- Brake hoses
- ADR 13/- Installation of lighting devices - eg: height
- ADR 14/- Rear vision mirrors - eg: altitude change
- ADR 31/- Brake systems - eg: partial failure
- ADR 43/- Vehicle configuration and dimensions
3.5.4.11 Changes to ride height Changes to ride height are limited to one third of the working travel of the suspension from kerb mass height to metal to metal bump or rebound positions as specified by the manufacturer. Such modifications must comply with the following:
- altered spring free lengths are acceptable providing the spring seat load is maintained at full rebound and material stresses are not exceeded;
- the use of extended spring shackle plates is not permitted;
- the suspension ride height of a coil spring suspension shall not be lowered by cutting off a section of the spring coils. New coil springs with increased spring rate specifications to provide for the reduced travel of the suspension shall be fitted.
3.5.5 Road testing The completed vehicle must be evaluated under a range of road operating conditions to establish that ride, handling and steering characteristics are appropriate for the vehicle character and proposed type of operation. While some of these aspects are subjective, the vehicle must not behave in an unpredictable manner under any circumstances and its general behaviour must not be significantly different from the majority of vehicles available at the time of road test. The vehicle must be suitable for subsequent sale to persons of average driving ability.
post edited by RHOK - 2015/04/20 14:48:51