Thread: Engineering Sign Off for 32s

I have been engineered for 34x11.5, 4" lift etc but we're playing a different game to you.

No D2s came out with anything other than 29" tyres.

But, what may help you regarding heights, is that the vast majority of D2's that I/we measured when new were delivered at the lowest end of the correct ride height tolerance. When you calculate you increase in ride height you can use the highest tolerance as your base level, so it will give some extra manouverability with the end result in relation to approval. Spexs are in RAVE.

As a starting point, try Rod Styles (somewhere in the Carlisle/Redcliffe area I think)
Experience
He was very good doing a compliance plate for me when I changed the detroit diesel engine in my bus. If he cant help, he will be able to give you some contacts.

There is an amendment to vsb14....the 4wd council negotiated a 50 mm lift and 50 mm in tyre size giving a total of 75 mm total lift.
The problems with 32s is that they are over the 50mm increase from the 29s.

That means tyres up to 31s are ok with a 50mm lift. This does not have to be signed off or examined.

32 s have to be examined regardless of how much lift or even if you don't get a lift......yes you can run 32s without a lift.

I have some details I will find regarding this subject that may help. (for WA only).
Actually it was you that gave me the contact for an engineer you spoke to about this and he was receptive, what's changed?

Originally Posted by gavinwibrow

As a starting point, try Rod Styles (somewhere in the Carlisle/Redcliffe area I think)
Experience
He was very good doing a compliance plate for me when I changed the detroit diesel engine in my bus. If he cant help, he will be able to give you some contacts.

Thanks Gavin, had a chat with Rod yesterday so good to know you've had a good experience with him.

Originally Posted by TD50WA

There is an amendment to vsb14....the 4wd council negotiated a 50 mm lift and 50 mm in tyre size giving a total of 75 mm total lift.
The problems with 32s is that they are over the 50mm increase from the 29s.

That means tyres up to 31s are ok with a 50mm lift. This does not have to be signed off or examined.

32 s have to be examined regardless of how much lift or even if you don't get a lift......yes you can run 32s without a lift.

I have some details I will find regarding this subject that may help. (for WA only).
Actually it was you that gave me the contact for an engineer you spoke to about this and he was receptive, what's changed?

Thanks - I got my letter back from DoT saying I need a lane change test and the engineer needs to suggest tyres but it sounded like he was saying 235s were too big, I'll have another chat with him once I've sent him my documents.

If you could dig out the 75mm in total amendment that would be great please, all I seem to be able to find is the 50mm total in VSB14 without sign off.

I am currently very slowly going through this process. You can see some of my other threads in the Modification Section on the forum.

Basically, I'm looking at having 285/75R16 tyres which are approximately 33" approved for use.

The issue that I currently have is my 3" suspension lift and covering the wide tyres. I am going to reduce the suspension back down to 2" and fit the Les Richmond Automotive flares (I have them in the garage, but haven't had a chance to fit them). Once this is done, I will have a suspension lift that doesn't need to be engineered (as 50mm or less) and the tyres will be properly covered. We found that with less than 3" suspension lift the tyres hit the guards, but with the Les Richmond flares taking out some of the material they should clear. Also with a suspension lift above 2" there were far too many other hoops and issues to resolve.

The approach that the engineer is taking is based on the similarities with the Defender which comes out with 31" tyres standard. Basically a Defender can go up to 33" with no engineering, and as they are similar (debatable I know) a Discovery can therefore too. This approach was originally suggested by Bill Malkoutzis from Talk Torque Automotive ( Certified Engineer ) who has done the engineering work for a few vehicles modified by Les Richmond Automotive.

Originally Posted by Shakey

If you could dig out the 75mm in total amendment that would be great please, all I seem to be able to find is the 50mm total in VSB14 without sign off.

I haven't been able to find much official about the amendment, but here are a few links which discuss it:

4WD Modification Legalities - under the heading of 'Vehicle Lifts'

The Australian 4WD Industry Council

For Victoria - this thread has links: http://www.4x4earth.com.au/forum/gen...uirements.html

It seems that while VSB 14 was a national initiative, some States have adopted other policies which override it in some ways. So some states may allow a lift beyond that which VSB14 allows.

You could probably contact them directly at The Australian 4WD Industry Council and ask which States have adopted their 75mm total lift recommendation.