UZZ32 Suspension

Full-Fledged Active Control Suspension

• A hydro-pneumatic active-control suspension without coil springs has been introduced: a first for a mass-produced car.

• This system reduces posture changes, such as car body vibration and roll, caused by driving conditions and uneven road surfaces. The system also provides a high degree of handling, stability, and comfort.

Source: Toyota press release

Suspension Features

Mechanical

Independent suspension on all four wheels

Hydraulics

Oil ('special' Toyota fluid) with Nitrogen

Electronics

Suspension Computer

Pressures

Once the oil pressure is released the floating piston rises to the top of the bottom accumulator. It is now ready for recharging. The fronts have to be recharged to 1750 kpa (254 psi) and the rears to 1500 kpa (218 psi) - common pressures for a car. Source: http://planetsoarer.com/nitrogen/nitrogen.htm

However: the gas pressure will increase considerably when the suspension strut is compressed. Thus, any refill valve being added will need to be rated for pressures well above these.

Taplin recommends using less pressure (220 and 180) to keep the piston centred and more suitable for (bad) Australian roads.

Source:

• http://alscforum.com/cgi-bin/discus/show.cgi?10801/27175

Height Settings

The UZZ32 suspension offers two height settings , Normal and High.

Test Mode

Other uses for test mode

The suspension test mode can be used as a quick way to raise the vehicle and provide access for eg, oil change, ATF fluid change

Rebuild options

Re-gas the accumulators

http://planetsoarer.com/nitrogen/nitrogen.htm http://activesuspensionsystems.com/lelx470susy.html http://www.soarerworld.com/forum/showthread.php?7206-Re-gassing-the-legs-on-a-UZZ32&highlight=Uzz32 http://www.planetsoarer.com/UZZ32/uzz32struts.htm

Suspension Pump rebuild

http://www.soarerworld.com/forum/showthread.php?5017-Active-suspension-pump-re-build/page3&highlight=Uzz32

New valves in existing fill ports

M5x0.8 screw. Allen key head. Re-gas with needle.

Possible suppliers include (?):

• http://www.shocktreatment.com.au/gastools.html
• http://www.bmsc.com.au/forums/rallying-technical/17490-diy-bilstein-shock-rebuilding.html (SOS a Suspension)
• http://www.promecha.com.au/myths_misconceptions.htm

New valves AND internal seals

Suppliers include Peter Taplin

strut removal

http://soarercentral.com/sc-forum/messages/30604/331320.html

diagnostics

http://www.soarerworld.com/forum/showthread.php?28928-How-to-do-a-diagnostic-check

shock absorber handbook

http://books.google.com.au/books?id=gIRHd5R_UoMC&pg=PA181&lpg=PA181&dq=gas+pressure+shock+absorber&source=bl&ots=_gNZ_9jbAE&sig=Gm4GQ0w3ULX1uzhqh488qipkUBc&hl=en&sa=X&ei=M-ENU77nL8ypkgW_1IHoAw&ved=0CCcQ6AEwATgU#v=onepage&q=gas%20pressure%20shock%20absorber&f=false