Hadley system 450LXi

[dentmac]

RE: Hadley system 450LXi
Hi Hish,
The solenoid and the wires are the only visible change but it is not correct that de-activating the solenoid will restore the system to pre-modification. The ECU (computer) was changed and the individual height sensors are used in a different way. De-activating the solenoid is possibly dangerous and affects sway minimally.
The ECU is at the rear of the Hadley manifold and accessible by removing 4 screws. It is labled "For use only with the Hadley crossover solenoid" and has a software change date and number-- Apr 2008)

Consider for example that the airbags have 100 psi each side-- when driving in a corner, the outside wheel will compress.
1. with the solenoid working and the sides plumbed together, the airbag pressures stay at 100 on each side and the body tips
2. cutting the wire and therefore separate airbag pressure-- the outside airbag compresses and the pressure rises some-because the sides are no longer kept equal pressure.- the body tips but not as much as in 1.
3. In original system-- outside wheel compresses and air is ADDED to the outside airbag and removed from the other wheel-- body stays flat. There is no need of anti sway bars in this type of Active air systems. (As David has indicated, the exhausting of the inside wheel can be faster then the adding air so the front of the coach may go down a little temporarily. (similar to HWH system)

There is a risk of significant side to side airbag pressure (and therefore wheel load) discrepancy by de-activating the solenoid without flashing the ECU.(discussed in previous post)

The Hadley was changed to keep the front side loads equal since moving the genset lightened only the RIGHT front by 500#. And with the "Active Air" in a corner, the opposite side tire ,wheel and suspension was overloaded.
The other 350# of steel removed in front of the axle was structural/protective and for towing and had no imbalance effect

Ross

quote='Hisham Amaral' pid='50407' dateline='1382140034']
Ross
All you have to do is to restore the system to original configuration is remove the ground wire to the solenoid you will be able to look in the first bay and you see what was changed to the Hadley ECU. I thing the solenoid is installed on number one height control.
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Ross
You can look at the system you will find what changed. BB added a solenoid to the Hadley ECU. You can look up in bay one street side and you will find the change, it is very much an after thought, wire are rigged to that solenoid, you can't miss the change.
Hish
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