Mitsubishi Evo's FAQ's Pt2
What do I need to be aware of when preparing an Evo 7 with the ACD system?
The steering wheel if changed must be mounted on a boss with a drive ring feature to engage with the steering wheel sensor. We can supply a boss with the required feature
- The steering wheel sensor is orientation sensitive relative to the steering wheel boss. Three pegs drive the sensor, one of which is a master peg offset to the other pair. If using the special boss with a Momo or OMP steering wheel, ensure that the boss is assembled with the “TOP” mark aligned correctly relative to the steering wheel.
- The ACD pump assembly must be protected with a cover particularly for gravel events to stop damage. Under GpN regulations it cannot be moved from it’s original position – which means it and the reservoir are vulnerable to side impact damage. We produce a thick Kevlar protection box, which if multiple fixings are used to retain it to the body, is designed to protect the pump in side impacts.
- The ACD system is sensitive to dirt. To achieve a high efficiency level the clearances in the pressure control valve are relatively small. Dust and dirt must be kept out of the system. Parts removed during car build or for service requirements and Spare parts must have closure plugs fitted to hydraulic pipe connections. Pipes and voids must be clean prior to connection, and dust dirt must be cleaned from the reservoir cap and oil bottle before filling the system. Technicians that dare ignore good working practices during build and maintenance works will be the most likely reason for failure of the hydraulic side of the ACD system. We have a carbon enclosure available into which the ACD reservoir can be fitted, this has been produced specifically to keep dirt out of the system during dusty events as well as isolating the fluid from the trunk area to comply with GpN rules.
- If you propose to replace the standard oil line of the ACD system, the fitting of Quick release self sealing unions is recommended on all joints that may have to be broken for maintenance purposes. The initial expense would be easily outweighed if a single pump failure is avoided by stopping the ingress of dirt.
How do I know if the ACD system is working?
All 3 mode lights on the dashboard will light if a fault were detected by the ACD electronic control unit on board diagnostics. On the road car a MUT2 dealer service computer is used for service works to “interrogate” the system. This is not available to non-Mitsubishi dealers and is an extremely high cost item even if you could purchase it. For road or Motorsport vehicles, a parts kit is now available to fit 2 pressure gauges into the production car system for monitoring purposes. This comprises 2 VDO 25 bar pressure sensors, pressure gauge a switch and an adaptors union kit as well as a wiring diagram. This allows the checking of the health of the oil pump, motor pressure limit switch and pressure relief valve as a “system pressure” The ACD differential itself is monitored as “ACD pressure”. The driver or technician can use a dashboard-mounted switch to check each via a single pressure gauge.