SLS or EAS, lifts and the law.

**Tins** · 6th May 2021, 02:20 PM

The following is a quote from pp26/7 of https://www.infrastructure.gov.au/ve...ov_2015_v4.pdf

Raising the height of the vehicle may be performed without certification providing the overallincrease in vehicle height is not more than 50mm. This may be achieved as a singlemodification such as the installation of a 50mm lift kit, or by a combination of smaller lifts asdescribed below: the fitting of body blocks or lift kits (50mm maximum if no other modifications resultingin a change of vehicle height are performed); suspension modification, (50mm maximum if no other modifications resulting in achange of vehicle height are performed); changes to tyre size (maximum change in tyre size diameter of 50mm); or a combination of the above that results in a change of vehicle height not exceeding50mm.

Simple question then. If maximum height increase without engineering is 50mm, where is the body height taken as being on a D2? Most of us are familiar with this:
IMG_2575.jpg
It suggests that body height can be increased by 75mm, or 35mm if the std body height is 1980, by the operator as a standard feature and must therefore be considered 'factory'. This label also seems to be present in non SLS vehicles.

Please, I am not looking for a way around having a lift or bigger tyres being engineered, and would discuss this with my VASS engineer when I can get down there, but I am curious.

**onebob** · 7th May 2021, 10:06 AM

Originally Posted by Tins

The following is a quote from pp26/7 of https://www.infrastructure.gov.au/ve...ov_2015_v4.pdf

Simple question then. If maximum height increase without engineering is 50mm, where is the body height taken as being on a D2? Most of us are familiar with this:
IMG_2575.jpg
It suggests that body height can be increased by 75mm, or 35mm if the std body height is 1980, by the operator as a standard feature and must therefore be considered 'factory'. This label also seems to be present in non SLS vehicles.

Please, I am not looking for a way around having a lift or bigger tyres being engineered, and would discuss this with my VASS engineer when I can get down there, but I am curious.

For a Discovery Series 2 the body height is measured in a vertical line to the highest point of the wheel arch opening. I cannot remember if it is measured overall from the ground or from the wheel centre with standard tyres. There is a spec for the front axle and another for the rear axle. I don’t have the info at hand (I’m at work) but I will post it this evening.

**ramblingboy42** · 7th May 2021, 08:37 PM

If I recall somewhere , D2 suspension height is from centre of wheel to underside of wheel arch. That was how I determined mine some time ago. Open to lot of variables.

tyre size makes no difference to this measurement.

**onebob** · 7th May 2021, 10:55 PM

From RAVE
FRONT AXLE - the nominal height from hub centre to wheel arch (not liner) is 500+/- 15mm

REAR AXLE > coil spring - the nominal height from hub centre to wheel arch (not liner) is 483+/- 15mm

REAR AXLE > airspring - the nominal height from hub centre to wheel arch (not liner) is 473+/- 15mm

Measurements apply with vehicle at unladen weight

NB: years ago I did come across another published document that was related to the VASS re vehicle modifications that contained tables of all “ADR approved vehicles” stating their vehicle heights and kerb weights, and regarding the D2 spec, I do remember that it did not agree with the Land Rover’s spec.

**Slunnie** · 8th May 2021, 09:23 AM

Originally Posted by onebob

NB: years ago I did come across another published document that was related to the VASS re vehicle modifications that contained tables of all “ADR approved vehicles” stating their vehicle heights and kerb weights, and regarding the D2 spec, I do remember that it did not agree with the Land Rover’s spec.

It's probably because pretty much all of the Disco2's have been delivered at the very bottom of the suspension ride height tolerances. When I was going through the engineering process I was able to use the very upper tolerance as the base spec and then lift from that measurement. The engineer was happy with this. I would also say that most 2" lifts are so close to being within LR factory specs also.

**Tins** · 8th May 2021, 12:19 PM

Originally Posted by Slunnie

It's probably because pretty much all of the Disco2's have been delivered at the very bottom of the suspension ride height tolerances. When I was going through the engineering process I was able to use the very upper tolerance as the base spec and then lift from that measurement. The engineer was happy with this. I would also say that most 2" lifts are so close to being within LR factory specs also.

I suspect that you have posted your D2's specs before, but could you please post your wheel/tyre size and your suspension lift for me?

**Slunnie** · 8th May 2021, 01:37 PM

Originally Posted by onebob

From RAVE
FRONT AXLE - the nominal height from hub centre to wheel arch (not liner) is 500+/- 15mm

REAR AXLE > coil spring - the nominal height from hub centre to wheel arch (not liner) is 483+/- 15mm

REAR AXLE > airspring - the nominal height from hub centre to wheel arch (not liner) is 473+/- 15mm

Measurements apply with vehicle at unladen weight

NB: years ago I did come across another published document that was related to the VASS re vehicle modifications that contained tables of all “ADR approved vehicles” stating their vehicle heights and kerb weights, and regarding the D2 spec, I do remember that it did not agree with the Land Rover’s spec.

Originally Posted by Tins

I suspect that you have posted your D2's specs before, but could you please post your wheel/tyre size and your suspension lift for me?

When setup as new my front H2G was 585mm, Rear H2G is 595mm. The 4WD is heavier now so doesn't sit quite at that height anymore. The suspension I developed with Lovells and Bilstein.

Wheels are all factory P38 16x8

Tyres are 285/75-16 Goodyear MTR and Pirelli ATR,
and 34x11.5-16 Simex Jungle Trekker 2 which come up at 35.2x300 wide. The guards are trimmed back to fit these tyres.

**Roverlord off road spares** · 9th May 2021, 08:09 AM

JOHN , BIGGER TYRES , HEIGHT YOU MIGHT BE BETTER OFF WITH ONE OF THESE.
OKA.jpg

PS l've been trying to you.

**Tins** · 9th May 2021, 09:37 AM

Originally Posted by Roverlord off road spares

JOHN , BIGGER TYRES , HEIGHT YOU MIGHT BE BETTER OFF WITH ONE OF THESE.
OKA.jpg

PS l've been trying to you.

An OKA figures largely in my future if I can find the right one. I'd love one of the new ones Dean is building, but they're beyond my reach. However, I don't see one as a daily driver.

My mobile is playing up, Mario. Reception is dreadful up here. I can call you a bit later.

**AK83** · 12th May 2021, 08:11 PM

Originally Posted by Tins

.... Most of us are familiar with this:
IMG_2575.jpg
It suggests that body height can be increased by 75mm, or 35mm if the std body height is 1980, by the operator as a standard feature and must therefore be considered 'factory'. This label also seems to be present in non SLS vehicles.

Please, I am not looking for a way around having a lift or bigger tyres being engineered, and would discuss this with my VASS engineer when I can get down there, but I am curious.

Better familiarise yourself with the diagram a bit better.

Carefully check where the arrows point too for the various 'ride heights' you are referring too.

They indicate the various high points possible on the D2 in it's various accessory and trim levels.

So the max height of a D2 with a tilting/raising rear sunroof is the 2015mm value when the rear sunroof is raised upwards(not when raised with SLS in OffRoadMode)
I have a D2 with rear sunroof, but it doesn't tilt up(only slides back).
The 1980 mm mark is pointing to the roof rack bars that D2's came with as an option .. once again not an indication of lift available in the SLS equipped models.

From RAVE, the difference between normal ride height mode and off road mode(ORM) .. is 38.5mm(lift), and obviously only at the rear too.

That is(again from RAVE).. normal ride height mode is measured from bump stop to axle at 61.5mm.
ORM setting with the SLS is then set to a 100mm bump stop clearance.

I can't tell 'ya if ORM is an allowable value for ADR specs, but for the sake of keeping it legal, I reckon you'd be safer to go by 'nominal' height quoted in RAVE.

So if yours is SLS, and you want to get absolute maximum lift possible, then using onebobs listed values from RAVE, and the allowances made too ... you could lift it so that the centre of the hub to wheel arch height could be 473mm(nominal) + 15mm(allowance)+ 50mm allowable by ADR laws .. ie. you could lift it to have 533mm from centre of the hub to the wheel arch at the rear.

Would it be legal if you lifted it by (say) 88.5mm(50mm + the 38.5mm lift that SLS supposed to give you in ORMode)??? ... will the person doing the checking know that D2 with SLS has this OffRoadMode?

Front would be 500mm + 15mm + your 50mm lift .. ie. 565mm hub to arch distance.

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