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Rwd 4eat
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Old 01-19-2014, 12:25 PM   #1
silverton
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Default Rwd 4eat

I tried to do some searching to see if this was possible and nothing came up. I was bored and needed to replace the boots on one of my front axles. I had already done the TCU mod to be able to lock the center diff, so I thought I would see if it were possible do RWD with it.

And it is! It actually moved under its own power with the TCU wired normally, but I didn't want to stress the TCU too much by letting it decide how much pressure the rear clutch needed.

I honestly didn't think it would work, but it works really well, and so far it's getting about 28mpg where I normally get 24. And boy does it like to go sideways!

I've only noted a couple problems. One is that you can't load up the torque converter to do a brake stand because the hydraulic clutch that drives the rear end starts to slip. No good. And the other is that once the vehicle is turned off there is no hydraulic pressure to the rear end, and it's essentially in neutral. Found that out the hard way when I didn't pull the parking brake hard enough.
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Old 01-19-2014, 07:42 PM   #2
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Sounds interesting, what exactly did you do to get the 4eat locked into RWD?
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Old 01-19-2014, 09:48 PM   #3
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I have a friend who had a '93 Legacy L with a 4eat. Let me set up a video, 4eats are very strong transmissions.


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Old 01-19-2014, 11:22 PM   #4
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Quote:
Originally Posted by ACE_2.5RS View Post
Sounds interesting, what exactly did you do to get the 4eat locked into RWD?
This: 4EAT Diff-Lock Switch and Handbrake Mod - "Torquemada Lite"
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Old 01-20-2014, 12:15 AM   #5
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Originally Posted by silverton View Post
I'm aware of that mod, and its intent was to achieve a 50/50 torque split for the from the regular 90/10 in a 4eat. I guess I should be more clear in asking: are you using the exact methods as outlined in the thread, or did you do things your own way? (if so, what?) I was under the impression that you couldn't take the 4eat beyond that 50/50 split... (going to re-read that entire thread again to see if I'm missing something here....)
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Old 01-20-2014, 12:24 AM   #6
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No, you didn't miss anything in that thread. In fact it clearly states that the clutches can't be pushed past 50/50.

Edit: They are not THAT strong by the way. Run that little prick a tiny bit low on fluid, and it will never be the same lol.
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Old 01-20-2014, 12:25 AM   #7
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Ah I see now! Very interesting!


Quote:
Originally Posted by silverton View Post
Tonight I had a highdea. If the center diff hydraulic system is getting 0v, then it's essentially "locked". Remove the front axles, and boom, rear wheel drive.
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Originally Posted by Kookookachew View Post
I have actually done this. In fact, my '93 is RWD right now Its almost as simple as just "locking" the center diff and pulling the CV shafts; but theres one more step.

You can't just pull the CV shafts. You have the take both ends off of the shaft itself and re-mount them on the car. Both on the transmission stubs and in the wheel hub. This is to keep the wheel bearings in place, and to protect the oil seals on the transmission side.

Luckily though, dissassembly of the CV shaft takes maybe 10 mins with no cutting, or breaking of anything required
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Old 01-20-2014, 10:35 AM   #8
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So it's not "true" RWD from the transmission itself. Technically with the way subarus transmissions deliver power, you could just simply remove the front half shafts. It would think the fronts were slipping and give traction to the rears.
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Old 01-20-2014, 12:53 PM   #9
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My thoughts exactly! also means that your actually wasting energy as 50% of the power is still being sent to the front (you just aren't putting it down onto the road). I thought you had done something like one of the Rigoli 4eat transmissions..
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Old 01-20-2014, 07:10 PM   #10
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Quote:
Originally Posted by Dirrtydetroit View Post
So it's not "true" RWD from the transmission itself. Technically with the way subarus transmissions deliver power, you could just simply remove the front half shafts. It would think the fronts were slipping and give traction to the rears.
But I'm thinking doing that would make the TCU freak out. front wheels "slipping" and the rears not. Even with it locked, giving it the beans from a stop and having the tires spin through all of 1st gear, it wouldn't upshift until I let off the throttle.

I didn't do anything fancy, and there definitely doesn't feel like any power loss. But it completely transformed the handling characteristics of the car, and going from AWD to RWD in ~25 minutes gave me a good back to back comparison. I definitely prefer the car RWD.
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