Vehicle lifts (high lift design and modification) – what’s allowed?

VSB14 provides the requirements for ‘lifting’ vehicles. Lifting can be achieved by increasing tyre size, increasing suspension height, body blocks or a combination of the three. The table below provides a summary of the specific requirements.

 

Your VehicleDoes not require VASS certificationRequires VASS Certification
Is your vehicle a pre-ESC vehicle?Lifts of up to 75mm in total do not need to be certified by a VASS engineer in cases where the suspension height has been increased by no more than 50mm, the tyre diameter has increased by no more than 25mm, and no body blocks have been used.

Alternatively, the suspension travel can be increased by up to 33% of the original suspension travel, (but no more than 50mm), if the tyre diameter does not increase more than 7.5mm and no body blocks are installed. This method limits your total lift to 50mm.
If you engage a VASS engineer, you can increase the overall lift to 150mm, however, the maximum limit for various elements are:
– increased suspension lift is no more than 75mm
– increased tyre diameter is no more than 25mm
– body blocks permitted up to 50mm in height.

If you choose to go down this path, you will need to have your VASS engineer perform a lane change test before the vehicle can be approved.
Does your vehicle have ESC?ESC provides significant challenges that can impact safety for aftermarket equipment manufacturers.

Lifts of up to 75mm in total do not need to be certified by a VASS engineer in cases where the suspension height has been increased by no more than 50mm, the tyre diameter has increased by no more than 25mm, no body blocks have been used and any suspension lift components have been purchased from a business that has developed the components specifically for your vehicle make, model and year. The installation of any suspension components must be accomplished in accordance with the manufacturer’s written instructions.

Alternatively, the suspension travel can be increased by up to 33% of the original suspension travel, (but no more than 50mm), if the tyre diameter does not increase at all and no body blocks are installed. This method limits your total lift to 50mm.
ESC provides significant challenges that can impact safety for aftermarket equipment manufacturers.

If you engage a VASS engineer, you can increase the overall lift to 150mm, however, the maximum limit for various elements are:
– increased suspension lift is no more than 75mm
– increased tyre diameter is no more than 25mm
– body blocks permitted up to 50mm in height.

If you chose to go down this path, you will need to have your VASS engineer perform a lane change test and an ADR ESC test before the vehicle can be approved.

ABMARC can perform these tests, however, we note that the costs are considerable.