coyoteboy

Hi all,

Wondering if you folks have a technical guru here who can help me identify some info I need?! I've just bought the supercharger from a C180 with an electronic bypass valve built in. I don't intend to fit this to a c180, so I'm trying to find out if anyone knows the pin out of the 6pin connector, and any details on voltages and control protocols?

Any help appreciated!

coyoteboy

Hmmm this appears to be the second MB forum I've stumped with this one.

gogos

The SC BPV is controlled via the ECU. Apart the function to close in order the engine to built boost and to open when the boost have reach the ECU max boost, the valve also, stays open when the car is not moving, opens when the ESP is activated and also opens when the MAF max out at 182g/s. There may be also some more functions but I don't know.
You can put a manual BPV and adjust the boost via a manual blow of valve or with the right pulley size. The M45 is a roots type sc, possitive displasment of 45ci or 750cc of air per turn. I have put an M45 to my old Jeep Cherokee 2.4L and I couldn't make the BPV work properly so finaly I put a manual one and everything works just fine.
If btw you want to stuck with the electronic BPV you can find all the wiring from MB star or Autodata 3.38 or 3.40.

gogos

Here is the ECU engine wiring harness, according Autodata 3.38. Good Luck.

coyoteboy

Now thats the kind of info I wanted! Thanks, that's great!

What were your problems with the attempt to use the electronic BPV? Did it not respond properly or was it a mechanical issue?

gogos

The problem was that I couldn't control when the BPV would open, because that function is controlled from the ECU. After that I change it with a mechanical BPV from MINI Cooper ONE and I calculate the maximum boost I wanted to have at redline. I take consideration the engine displacement, and then I play with the pulley, SC or crank. If you make it that way you don't have to put a BOV.

coyoteboy

Ah I see, my plan is to replicate the ECU control via my own control box so I should be able to keep the standard valve, I just need to find the control method. I think it looks like a variable voltage input and some feedback but I'll have to crack the valve open to see.

<edit>
Ah thanks for the image, how do I download the "non thumbnail" version, it seems to open rather pixelated and it looks pretty handy!

coyoteboy

In case it helps anyone, I put this together after stripping my valve...

jtcc1015

Did you need to remove the whole supercharger assembly in order to get to the Recirculating Air Flap Assembly?

coyoteboy

Sorry, I didn't have to extract it from the car - mine was bought for another project car as a standalone unit. The valve is bolted into the body with 4 torqx head screws and a clamp-on rubber hose, I suspect that if you can get to the heads of the screws you can probably extract it with a wiggle. I just can't tell you if you can get to those screws.