Thread: Ikea 6X6D - anyone have an allen key?

Hi I've purchased the later Defender stub axles which will correct the track difference. My Defender already has the narrow bearing spacing so there won't be any change in bearings. Was talking to Barry Ward at Hi-Tough Engineering (Maxi-Drive axles) and we may be able to make up any halfshaft differences with special or maybe even the HTE-X flanges.

Have also decided to use ventilated rotors on all axles so my mounting plates will be different and by using aftermarket callipers I can get the front rear bias correct.

Any progress on this.

It's a cool beast. Hate to see it fade away.

I.

the holdup is the MSA transmission and the fact that I'm spending weekends moving the last of my toys off the now sold farm.

Originally Posted by blackrangie

From the research i have done thus far:
<snip>
But intelliride might be the go becuase they are used on trucks and busses with 3 axles im sure and very customizable (windows based)

From the investigation in the US, the suggestions have been to place sensors on one of the rear axles, probably the 3rd and have it managed as a single bag.

When off road, lock the sensors out of the system so they don't start reacting to the axle movements over terrain with the processor command outputs as if its a flat road.

AFAIK, the big problem (and its the same for bogy trucks) is that the air transfer between bags is not instantaneous so the bags are reacting to terrain events that have already passed.

Joining the bags together is the only way to get some form of load sharing, otherwise, on coils when climbing over steps, the entire load can be on a single axle and diff with the other suspended without traction.

Originally Posted by Lotz-A-Landies

From the investigation in the US, the suggestions have been to place sensors on one of the rear axles, probably the 3rd and have it managed as a single bag.

When off road, lock the sensors out of the system so they don't start reacting to the axle movements over terrain with the processor command outputs as if its a flat road.

AFAIK, the big problem (and its the same for bogy trucks) is that the air transfer between bags is not instantaneous so the bags are reacting to terrain events that have already passed.

Joining the bags together is the only way to get some form of load sharing, otherwise, on coils when climbing over steps, the entire load can be on a single axle and diff with the other suspended without traction.

The system should only attempt to level when stationary. Not when moving.
So it shouldn't be reacting to terrain at all.

However with EAS doesn't it also activate in an anti roll situarion when cornering? i.e. when cornering at speed the weight goes to the outside (centrifugal force) depressing the bags on that side , the sensor detects the vehicle low on one side of the axle, so increases pressure on that bag reducing the body roll. After the corner the excess weight on the outside wheel dissipates and the sensor detects high on that side so reduces pressure in the bag till the sensor registers the normal height.

Originally Posted by Lotz-A-Landies

However with EAS doesn't it also activate in an anti roll situarion when cornering? i.e. when cornering at speed the weight goes to the outside (centrifugal force) depressing the bags on that side , the sensor detects the vehicle low on one side of the axle, so increases pressure on that bag reducing the body roll. After the corner the excess weight on the outside wheel dissipates and the sensor detects high on that side so reduces pressure in the bag till the sensor registers the normal height.

**** no.
That's getting into the realm of active suspension where any incorrect instruction can make the vehicles completely unstable. This is PID control of servo-pneumatics, it's a seriously complicated field and not something you'd ever get into as a retrofit.

Simon (mechanical engineer from X-Eng) in the UK did have a tinker about 10 years ago and then gave up. You can read his exploits here: Sproklegrommet - The Unorthodox Engineers

Notice the comments about having to pull power from the controller when it went unstable during tuning!

As well as the instability and safety issues there are also massive air consumption associated with trying to run active air suspension on the fly. The only things EAS will do on the fly is raise to ride height (from access or low-profile mode) or drop to low-profile height. The height adjustment is far too slow to be completed around the average corner.