Ok been looking onto this for a long time...check on the net for your local motor reg regulations, the following relates to South Australia (and my interpretation
) but I believe its pretty much universal these days so cars are compliant as they drive between states....
the basic info from the S.A site
Code:
Acceptable 'eyebrow heights' (the measurement from the centre of the wheel vertically upward to the edge of the mudguard)
or 'bump rubber clearance heights' (the clearance between the bump rubber and corresponding contact point) for most passenger
vehicles can be found on the Passenger Car Track List for 1970 and later vehicles .
Other requirements for lowering a vehicle include:
either front or rear, the suspension travel must not be reduced by more than one third of that specified by the vehicle manufacturer
the vehicle must also retain 100mm ground clearance which is measured between any part of the vehicle and the ground
all measurements must be carried out with the vehicle on level ground in its normal operating but unladen state
coil springs must not be shortened by cutting, and no suspension component is to be subjected to heating
lowering blocks may be used on leaf spring suspensions provided they are manufactured from steel, aluminium, or metal
and to be positively located to the axle spigot hole and the spring centre bolt. Note: the axle mounting 'U' bolts are not permitted
to be below the lower rim height.
Now the fun thing is it says the travel cant be dropped by more the 1 third, so if we take the fronts
min allowed eyebrow height for a VR of 346mm, 1/2 that give us in theory 1/3 of the travel which is 173mm.
Now if we add the min eyebrow height(346mm) with 173mm we should get what is deemed the full travel of 519mm...lol Ive seen 4wd with less, the only way your getting that figure is if you jack the car up with all the weight of the car...
My stock front eyebrow is 375mm so Im thinking factory fresh its prob 380mm or so.IF we take the stock eyebrow of 380mm with a 1/3 drop comes out assuming my maths is right
to 254mm,
that should make the wheels nice and tucked under the guard
anyway sorry for rambling
Im just being cautious with my planed lowering as there has been a lots of VR/VS super low springs and defected cars for to low on gumtree late last year.....
