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Old 03-24-2003, 04:00 AM   #1
ImprezedRS
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Member#: 2771
Join Date: Oct 2000
Location: Charlotte, NC
Vehicle:
2003 BMW Z4
Blue

Default Auto RWD Conversion

Ok So I have been wanting to do this for a while and I will have the time to do it tomorow. Here is what I believe that will be needed to do this conversion:

Time & Something to cover the front halfshafts on the tranny

Well thats seems pretty cheap right?

OK this is how I think it will go

Ok for starters we all know that the 4EAT uses a electronic multiplate clutch(except certain models with VDC, thin thats what its called). Which is controlled by Duty Selonod C, which inturn is controled by the TCU. Now I don't now how the TCU controls the Duty Sel. C, if its by voltage or ohms. But I did find out one thing if it fails the AWD control will be set to maximum and the rear wheels will always be powered. SO if you disconnect the Duty Sel. C then the TCU thinks its failed in turn turning the car into Fulltime AWD 50/50 split. NOw I know some of you might just stop there but I plan to go further.

Now that we have Full time AWD we can now make it RWD. How do we do this, well simple pull out the front driveshafts and cover up the half shafts on the Transmission casing. Now this part I havn't got to but will figure out a cheap way to cover it up. Basically need to cover it to keep things out of there like dirt and sticks and babys, don't want to mess that up.

Now last but not least we might wnat to upgrade the rear diff. Why do you ask? Well we have a limited slip, at the least the RS' do, but not a very good one. Well what I plan to do is to see if the rear diff that came out of my friends 91 240SX will fit. Its a R200 Limited Slip but still not that good. The only reason I'm going to do this is to see if the Vicousus(sp?) one out of the 91 240SX with the Super Hycus will fit, which is a very good one and is a very popular upgrade for the 240SX people. So if it does fit then its tims to go find that rear diff which I think I know where one is for cheap too.

So there we are all done and now have RWD automatics.

Now for the bad part, I have not had a time to test to see if this will even work but I will be doing this tomorow since I will have lots of free time. So I will tell everone if it does or not and where the duty sel. C is located but some might already know.

Now for all the people that will say "Why are you going to ruin the Subaru which is acclaimed for its AWD?" Well the simple answer is I like to Drift and its hard to drift an AWD vehicle. Even though I have mastered this allready I want to be able to pull off the RWD drifts which is the ****. So if you don't like this idea then shut up and find some other thread to ruin. But thanks to everone else that likes the idea and to post good things.

I will update this post after I have finished this and will tell everone the outcome of it.
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Old 03-24-2003, 09:28 AM   #2
Legacy777
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Location: Houston, Tx
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1990 Legacy & 97 OBS
AWD 6MT EJ22T AWIC Swap

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A couple things you should know. The auto tranny's are not meant to be run in 50/50 all the time. The rear clutch plates will most likely not hold up. Not to mention a loss of power due to the fact all the engine's torque was not meant to be passed through the rear clutch packs.

You will most likely have premature transmission failure, increased tranny temps, and overall crappy performance.

This is if you actually are able to pull this off, and not mentioning any of the other possible issues.


The fact that you don't even know where the duty c solenoid is, is reason enough not to even do this. I could see messing with the duty c solenoid.....and putting a switch in there to make it 50/50 split on command.......but to go to the extent of removing the front drive shafts...........ever give any thought to how you're going to hold the hub and bearings in place without a drive shaft in there? hmm?

BTW, the duty c solenoid is in the rear extension housing of the transmission.

I suggest you do some reading on your AWD system

http://www.main.experiencetherave.co...er_system1.jpg
http://www.main.experiencetherave.co...er_system2.jpg
http://www.main.experiencetherave.co...er_system3.jpg

Josh
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Old 03-25-2003, 03:00 AM   #3
ImprezedRS
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Join Date: Oct 2000
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2003 BMW Z4
Blue

Default

WelL i now where the Duty Sel C is, its located in the rear housing of the Transmission, you can't acsess it without removing the rear cover which would be worthless time when you could just cut the wire fromt he TCU that runs to the DUty Sel C. Now I know where the TCU is locatd but the only problem is now that the wiring diagram Ihave is wrong so I'm stuck.

Actually Legacy777 do you have acssess to wiring diagrams for the TCU? I need to find out the pinouts to find which one is the wire for Duty Sel C.

I also have a thought on how to do the Hub and bearing thing also but not sure on that just right now.

But I'm having to scrap this idea for a while, While I was inspecting the hubs on how to hold it all together I noticed my Left front whell bearing is shot, I started hearing noises this morning. I have ordered the new bearings and seals and hopefull yi can get them within the next week and hopefull my friend will let me use his press to press them in.

Another thing I noticed about the Multi clutch pack is that it is designed to slip so it would slip before breaking anyways but yes your right about the premature failure of it. If I get this to work alright and I decide to keep it RWD I will have the Clutch pack replce with a solid unit and the front diff also removed fromt he car.

But if you could help me find the wiring diagram for the TCU then you could help me in this project and while I'm waiting I will run test onthe wire and see how the Duty Sel C is actually controlled and I might be even able to set something up so that you can be able to adjust the torque bias on the autos. I have already made some diagrams for the setup for a unit to doe sthis I basically need to know How the Duty Selc is controlled and IF its done by Ohms or Voltage
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Old 03-25-2003, 09:49 AM   #4
Legacy777
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Join Date: Mar 2001
Chapter/Region: TXIC
Location: Houston, Tx
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1990 Legacy & 97 OBS
AWD 6MT EJ22T AWIC Swap

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I have TCU pinouts for the early gen legacies, but I'm not sure if they are going to be the same as your car. Take a look around on Scoobymods or email one of the guys on there. They may be able to give you a pin out for your TCU.

As for the type of signal. The duty C solenoid uses Pulse Width Modulation (PWM). Not sure if you're familar with this, but it essentally just sends a voltage but does so by sending it, then turning it off and back on again...etc.

Let's say you have a 100 sec. time interval. If the computer turns the voltage on for 60 sec out of that 100 sec, you would have a 60% duty cycle. Duty cylce is how most PWM circuits are measured.
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Old 03-26-2003, 08:31 PM   #5
ImprezedRS
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Cool thanks Legacy
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