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  #16  
Old 12-11-2004, 09:46 PM
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svxfiles svxfiles is offline
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Porter, welcome to the club!
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  #17  
Old 12-12-2004, 01:04 AM
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Using the ring and pinion (possibly just the ring) out of an automatic '97/'98 Outback.

Using the SVX TCU.

We'll see what happens.


Thanks for the 4.xx club welcome guys!
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  #18  
Old 12-12-2004, 06:31 AM
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Quote:
Originally posted by Porter
Using the ring and pinion (possibly just the ring) out of an automatic '97/'98 Outback.

Using the SVX TCU.

We'll see what happens.


Thanks for the 4.xx club welcome guys!
Cool. The 4.44 ring & pinion from the Outback will be strong enough for your racing/ spirited driving needs!

I'm sure your SVX TCU will communicate just fine with the solenoids in the JDM trans. The Impreza 4.11 trans that's in my car, used to belong to Huck369, and he had it rebuilt by a guy that rebuilds transmissions from right-hand drive JDM Subarus used by the US postal service. Needless to say, the JDM parts in my rebuilt trans work seemlessly with my SVX TCU...

-Chike
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  #19  
Old 12-12-2004, 11:39 AM
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Whats beefier about the center? More clutches or something?
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  #20  
Old 12-12-2004, 02:58 PM
Green1995SVX
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Quote:
Originally posted by THAWA
beefier center?
The RHD SVX's have a mechanical center diff much like the USDM 5MT boxes. They're supposed to be able to handle more power than our electronic clutch type center. I'd be willing to bet you're going to need to swap in the TCU from the B4.

Mike
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  #21  
Old 12-12-2004, 03:34 PM
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Quote:
Originally posted by Green1995SVX
I'd be willing to bet you're going to need to swap in the TCU from the B4.

Mike
I'd love to, but I don't have it. The trans has the same number of wires in the same configuration as the SVX trans, so I'm guessing the function of the center diff is not electronically controlled.
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  #22  
Old 12-12-2004, 08:17 PM
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so it's a VTD trans then?
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  #23  
Old 12-13-2004, 11:51 AM
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It should be the VTD center diff. Its not really like the center diff on the 5MT. The 5MT has a spider gear arrangement for 50-50 torque distribution. The VTD center diff has a planetary gear center diff with a 35f/65r torque split. The plantary gear center diff by itself behaves as an open diff, so Subaru uses a clutch in conjunction with the planetary gears to provide limited slip between the front and rear drivelines.

I did look once at the layout of the VTD center diff on the 4EAT, and to my recollection, the clutch is electronically controlled. It will be interesting to see how well the VTD system works with the MPT TCU. The MPT TCU is constantly varying the amount of MPT clutch action even when the tires are not slipping. I wonder if the VTD clutch will do the same.
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  #24  
Old 12-13-2004, 01:27 PM
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If this works I'm going to have oversteer city.


I'm considering attempting to fit the Outback LSD module into the front diff... I don't know if anybody has ever tried putting a viscous coupler in the front.

As far as I know the Cusco diffs for the WRX are the same front and rear... i'm wondering if the automatic has a compatible setup to bolt a rear diff VC unit to the ring.

Last edited by Porter; 12-13-2004 at 01:30 PM.
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  #25  
Old 12-13-2004, 04:01 PM
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Quote:
Originally posted by Porter
If this works I'm going to have oversteer city.
...
Is your car on the verge of oversteer now? Just curious, because my car with my springs, a 19 mm rear bar, and a 5MT with a STi 20 kg/100 rpm center diff still does not radically oversteer. It mostly just 4 wheel drifts.
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  #26  
Old 12-13-2004, 04:21 PM
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Quote:
Originally posted by Porter


I'd love to, but I don't have it. The trans has the same number of wires in the same configuration as the SVX trans, so I'm guessing the function of the center diff is not electronically controlled.
Hi Jason, good to see you back on the right forum.

The only problem would be the operation of the VTD unit. The signal for the C solenoid is different, as is the C solenoid and valve unit. Put the fuse in the US mod and the C is turned off. On the VTD it is turned on.

I drive the VTD in my SVX and the Transfer in my Liberty, they work differently. The way they respond in a corner is like chalk and chesse. The Liberty can't apply a lot of AWD through corners, the VTD can used the full split, even under full throttle, through corners.

Does that trans use a band or clutch?

Harvey.
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  #27  
Old 12-13-2004, 05:03 PM
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Quote:
Originally posted by oab_au


Hi Jason, good to see you back on the right forum.

The only problem would be the operation of the VTD unit. The signal for the C solenoid is different, as is the C solenoid and valve unit. Put the fuse in the US mod and the C is turned off. On the VTD it is turned on.

I drive the VTD in my SVX and the Transfer in my Liberty, they work differently. The way they respond in a corner is like chalk and chesse. The Liberty can't apply a lot of AWD through corners, the VTD can used the full split, even under full throttle, through corners.

Does that trans use a band or clutch?

Harvey.
Sounds like a simple soln for solenoid c. Just leave the fuse in place?
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  #28  
Old 12-13-2004, 05:35 PM
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Quote:
Originally posted by SVXer95

Sounds like a simple soln for solenoid c. Just leave the fuse in place?
But then either the front or rear wheels can spin. The clutch just acts as a limited slip device. It does not alter the torque split to the wheels, as the Transfer system does.

Harvey.
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  #29  
Old 12-13-2004, 06:06 PM
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Hmm.... so what's the issue? Do I need to wire something up with the VSS? Do I need to mock up a circuit involving wheelspeed sensors? ABS signal?

I can get crafty with Hall effect sensors if I need to...

Thanks for the info and the welcome back, Harvey. It's good to be back in the family.


Of course, leaving the system "locked" at 35:65 might not be bad, if that's its "off" state.
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  #30  
Old 12-13-2004, 06:10 PM
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Quote:
Originally posted by oab_au


But then either the front or rear wheels can spin. The clutch just acts as a limited slip device. It does not alter the torque split to the wheels, as the Transfer system does.

Harvey.
That is what I get for trying to think about car stuff while yelling at hp customer service on the phone. That was dumb.
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