Engineering for lift

[rjvines]

There is something in the Vic rules about measuring suspension travel stock and post lift, if the lift doesn't increase travel by more than 1/3 of stock you are ok...I have no idea what stock travel is though

[xdefender]

Originally Posted by rjvines

Wow, i was hoping for 6-700, maybe 1k on the most, not looking good.

lol a friend of mine paid something like 7g to enginee his VL commodore.

[task82]

Originally Posted by MightyMouse

And to top it all off there's the ESP issues........ VSI 13.7

This is the biggest issue I've ran into when making enquiries with VASS accredited Engineers, all that I have spoken to have said no way because of the ESP and recommended getting an older 4be and it will be piece of p1ss to engineer

[Rock God]

Ok heard back from sandown and to hire the track is $6250 and the front straight only is $1100 which is what they would need to do there thing, so add the 2k for the test your looking at $3100 minumim to do a lane change. No find a way around that ESP.

Anyone in ausjeep land ever done this to a modern jeep?

[rjvines]

...be a lot cheaper to replace my 3" springs with 2"...

[Harley]

ok. I might be able to help here. The trick with ESP is to find an engineer who will complete the lane change and brake test, and have faith that those ADR standards/tests confirm the vehicle still performs to same standard as OEM. That is (at least in part) the purpose of the test in the first place: to confirm the vehicle is still stable under sudden braking and lane changes at certain speeds and distances). It is a test of the sum of the system.

If the engineer's line of thinking is that they need to somehow connect to the ESP and determine if the lift has affected performance somehow and measure/record and show evidence, then that would likely be a complex and costly exercise and I have heard some crazy costs for that....and for that reason many engineers would run away screaming from a modern vehicle with a lift/tyres and ESP.
From a cost point of view...the engineer will need to cover their own risk, insurance liability that they are carrying (given roads authorities are delegating engineering authority here), plus their time to conduct measurements, inspections and write reports (at least a day or more involved), plus a stretch of road with no other cars and sufficient distance and width to conduct the tests (i.e. a runway or race track). So no way could all that come in under a grand.

[rjvines]

so reading notes on 13.7, any lift or tyre size (and possibly type eg AT v's MT v's Hwy) change on any ESC equipped vehicle, including dealer fitted equipment, renders that vehicle unroadworthy unless there is evidence from the manufacturer that the ESC is unaffected

so even if i went back to 50mm or less the vehicle would still be unroadworthy