Possible?

Jarrett

 

Sure, anything's possible. I still haven't found an S5 wiring diagram yet, but it looks like there are only 4 steps, so if you can figure out the reference (rpm prob.) & figure out how to hook it into your system and control it, you're set. Ha, it's probably controlled by the ECU so the problem would be................Hell, I'm not that good with electronics.

Nobody's tried it before? I'm lazy and didn't search 1st.

 

No.

The S5 MOP is electronically controlled by a stepper motor, which receives its commands from the ECU. The S4 MOP is purely mechanical.

Brandon

 

the S5 OMP is 9 wires!!... I have no idea where they all come from. probably not all from the ecu...

first you would need the S5 ecu. which probbaly wouldn't plug into the s4 harness anyways... then you'd have to add the extra wires.

 

So you guys don't think that someone good with electronics could could build something to run it w/o the S5 ecu? Need to learn more about how it works first though. I'm just assuming each position on the stepper motor corresponds to a certain RPM or range.

 

You could always have it so its on full blast when the car is running. You would have excessive oil consumption though

 

Ha, I wouldnt even want to try that conversion!

 

The question is not if or how, but why? The mechanical one is generally regarded as being more reliable, and apart from slightly reduced oil consumption (from more precise metering) I can't see any advantage. You'd need to run the S5 ECU, injectors, loom, etc, which is a lot of work for very little gain.

FYI, seven of the nine wires go to the ECU, the other two are 12V.

 

I didn't want to say it.

 

Each position of the stepper motor corresponds to an oil flow. The position is dictated by air flow and throttle position. The standalone FD guys have been looking for a way to control the MOP for a looong time, but it's not an easy thing to do.

Premix pwns j00.

Brandon

 

Well, thanks all, just wanted to pose the question.

Jarrett

 

Actually, anyone with minor electronics experience could build a control circuit out of a PIC or other microcontroller. I have been meaning to do this since it is very simple, but I don't think there is a market for it. The electronic metering oil pump should be swapped for a mechanical unit whenever possible.

 

I'd like to agree, but it'd take more than "minor" electronics experience. There are two state variables that you'd have to track (RPM and airflow), and the oil injection level is nonplanar (see SAE 900036). The technical issues are nontrivial.

There's also a large risk involved in marketing such a device. Overinjection can lead to the annoyance of the constant need to top off the oil level, plug fouling, carbon buildup, and possible engine failure. Underinjection can lead to excessive wear, and thus engine failure.

Brandon

 

Well, reason behind the question was, I was having problems removing a front E-shaft pulley for the S5 motor I was putting in an S4 motor.

But the bolt finally came loose, so the S4 front housing (read mechanical OMP) is being installed.

Jarrett