Engineering for lift

[037981]

Originally Posted by timbotrog

A lift "kit" can be engineered to fit the same model or models of vehicle at it's maximum weight capacity.

It's the kit itself that is getting ticked off. You can go out and buy exactly the same components from another supplier/s and fit it to exactly the same vehicle weighing exactly the same but those components from that supplier or suppliers have not been signed off and certified buy an engineer. It is the company, in this case JeepKonnection, that have spent the money and time having their lift "kits" engineered.

The thing I found the most amazing about all the responses on the orignial question is why no other company purporting to be "Jeep Specialists" have even bothered to make an effort to have their supposed "kits" engineer legally.

And the really stupid thing is if you want the largest tyres you can legally run without being engineer, buy a JK Overland! They come with 255/70/18 as standard. A 50mm increaese means they can run 35" tyres with not changes.

I'm off to change the tyre placard sticker on my Rubicon.....

no 34" not 35" tyres .
255/70/18 = 32.1in +2"= 34.1

[Thommoed]

im enjoying some of the comments coming out here lol.

ive enquired at suppliers before and as soon as you mention compliance it all goes quiet. there isn't much that is their responsibility but if they could offer a compliance service as well, boy would that work in their favour. I think 4wd usa was o the track to doing this here in wa before eddie passed, I rember reading some minutes from old dpi meetings he was involved in.

then there is the biggest problem of all with this whole discussion. the wife. try to convince her that you need to spend another 10 or whatever thousand because you need those big tyres and big lift and now you are worried about compliance...

the dpi guys should really hold information sessions and make the information a bit more readily available for everyone, and maybe just put a bit of this in when you are going for your licence in the first place so you at least know where to look....

wooo the joys of a jeep

[MightyMouse]

Another interesting challenge, is that in Victoria at least, if the vehicle is fitted with ESC the engineer needs to prove that its operation hasn't been affected by the vehicle modifications.... Needless to say lifting a vehicle changes its dynamics so ESC is frequently a problem

Apparently unlike the alternative brake and lane change tests VicRoads haven't "ticked" an alternate ESC test, meaning your left with the full ADR test... tens of thousands of $$, no guarantee that you will pass and of course its per vehicle if done through VASS. Just reading the ADR is an exercise in scary.... steering robots, tenth order phaseless Butterborth filtering... WTF !

Obviously ( hopefully ) there must be a loophole somewhere in the system.

Something I also read for NSW at least, replacement wheels can not exceed 25mm width more than oem in other words 8.5" is max. AND they need to be same offset from oem which I find odd. So I suspect nearly all of replacement wheels which I've seen are not compliant unless you can correct me.
Also can I ask - if you have same oem diameter wheel/tyre combination but only 3"/75mm lift is that legal without engineering? Thanks for all info so far



Sent from my Jeep

[SeaComms]

In QLD its the offset that can be up to 25mm more for a solid axle (12.5mm more independent suspension). Rims are up to 50% wider, however since you can not increase the offset by more than 25mm and you cant really go any further toward the suspension on most modern vehicles this one is fairly irrelevant. I am pretty sure NSW is the same.

As for lift, unfortunately all components are looked at individually.

[rjvines]

Originally Posted by Harley

2 inch lift. No additional tyre increase as that would exceed 50 mm allowable total. 50 mm wheel track increase for 4wds. So 2 inches up and 2 inches out.

There are very few aftermarket wheels for JKs that remain inside that sort of track increase. 1 inch each side. You could technically go all tyres and no lift.

My understanding was that track changes are measured from the centre point of wheels not tyres, so anything you can fit on stock tyres, or without using spacers is all good.

[Thommoed]

Originally Posted by rjvines

My understanding was that track changes are measured from the centre point of wheels not tyres, so anything you can fit on stock tyres, or without using spacers is all good.

I thought track change was the distance between the 2 outside edges of the tyres?