litton wrote:
Would you give a real quick summary of what the kit does. I know it was covered in detail in a prior thread but a recap may be useful. I would be more interested in a plug an play version over a kit.
tks
In Turbo Tim's words...
The ORM circuit is an electrical equivalent of the two controlling valves (EGR & AFC), this all fed by the MAF, to keep the computer happy, while none of the real components work, thus keeping the intake clean. Now I want to point out that this is strictly for off road testing only and that I never would suggest anyone else do something they shouldn't.
The circuit that I am currently working on is a great sprinkler timer modification, but it could possibly fool the EGR requirements for the CRD too.
The problems from what I have gleaned from all the posts is how the resistors were added in between the MAF and CPU. The problem is the MAF drives an analog voltage to the CPU. The input side of the CPU usually has a pull down resistor so it can detect if the wire breaks. The input usually goes to an analog-to-digital converter to feed the processor. The problem is/was that by adding resistors to lower the voltage, it changes the input impedance and throws the scaling off. I plan on using a few OP-Amps so that the loading/scaling stays the same until the EGR & AFC signals start to have their input effect.
The other problem with using relays on this line is that when it switches from one resistor to another, for a short time, this line goes open, thus upsetting the CPU (open is a fault condition).
No guarantees here, just a lot of analyzing that needs to be done first before the actual install.
The other thing that needs to be done is to simulate the load of the EGR & AFC so the CPU thinks they are still hooked up.
For more in depth info please see the ORM Circuit thread.
Dennis
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2005 CRD Limited
1.5/2.0 Daystar Lift
V6 Airbox
SEGR ala TurboTim
255/70/16 Big O on Rubis minor trimming required
87k+ miles=3 factory TC's, 2 front pumps, 1 turbo, & drivers side wheel bearing/hub
Suncoast TC and Transgo Snake oil-41k
New Front Drive shaft-30K
Stage 2 InMotion Tune-54k, makes me go
B&M Tranny Cooler