Thread: 20" rim D4 on Border Track, SA

The different size tyre would have caused the ABS ecu to detect a steering angle/wheel speed discrepancy fault to which the suspension ecu responds by lowering to safe height (access height, not the bump-stops) and issue the 50 kph max speed message. As already mentioned, driving at high speed with 1 smaller wheel can cause mechanical damage so the warning was appropriate, as was having it trucked. Driving at the safe/access height at speed is also dangerous as the vehicle will bounce badly over bumps, possibly resulting in loss of control.

Edit: Could the compressor have sustained damage from the trucking?

I use same tyres/rims and have been a few times on Strabroke and Fraser Island, no issue on sand. But ran at 18-20 psi. What pressure were you using when you were on sand?

The other thing, did you turn DSC off when in sand? These vehicles are brilliant but...I have dragged D3/4 out of sand where driver had tyres at road pressure, DSC on, didn't know where recovery points were, and were in normal road mode. They really require driver to know how to use them for different situations. Unlike a Colorado

Originally Posted by Fatso

Watched an episode of Top Gear where Captain Slow put a full fat RR through the wilds of Canada over rocks water and sand on big rims with standard road tyres against a large Army 6x6 , went places I would not go and did not seem to have a problem . As said earlier take your time .
I Think its up to the driver how good things go or don't go .

But what you did not see were the numerous punctures the RR had on that shoot.From memory it was around 6 or 8.

Originally Posted by DIS4

I suppose you might listen to anyone who have more experience than a rookie, but apparently they don't have good understanding about D4. is Air compressor under Driver side with a plastic cover? I will have a good look in the morning, make sure that is not physical damage. Once a stage, I thought about to get a defender in order to have good clearance, will LLAMS, GOE ROD resolve most of clearence issue?



Thanks for all.





Gary

The compressor is passenger side below rear door between sill and chassis rail.

I would strongly suggest Llams - yes it will solve clearance issues and is fully accessible from drivers seat with the benefit of on-the-fly selection...

On outback trips I use it extensively, normal height on fast sections and +30 on rough but moderately quick then up to +50 for the fun stuff.

Without the +30 on the Maralinga run I would have done damage on the fast undulating surface.

Originally Posted by DIS4

I will have a good look in the morning, make sure that is not physical damage.

So what are the symptoms/problem that make you concerned about the compressor? The 50km/h message and other errors were due to the wrong size wheel fitted as Graeme described. Is there something else happening?

Scott

I often have the suspension vibration noise, I presumed it is from compressor.

Originally Posted by DIS4

I often have the suspension vibration noise, I presumed it is from compressor.

Ok, so the noise is the same as before the incident with driving the small wheel?

If so, it could be the normal noise of the compressor working. You can hear it when it's running.

Scott