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  #31  
Old 12-13-2004, 06:24 PM
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Quote:
Originally posted by Porter
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.

The Outbacks have front LSD's? I know the R160 rear diff is smaller than the front diffs. I wanted to do the LSD thing in the front of my Loyal I wonder if the Cusco diffs are for the R180 rears. They might be the same size as the front diffs.


Yeah and welcome back, don't go AWAL on us again OK?
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  #32  
Old 12-13-2004, 06:37 PM
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No, I'm referring to the VC unit out of the Outback rear diff that I'll be cannibalizing for its 4.444 ring and pinion going into my SVX rear.

I'm wondering whether the VC unit can be bolted to the front ring gear in place of the existing spider gears.

I'm doubting that it would work properly... IIRC the STi front differential is a 1-way unit, i.e. it only limits slip on acceleration. A VC unit would tend to work whenever there was a difference in rotation between the sides, so it would probably cause erratic operation and then burn up fairly quickly.

I'm just brainstorming through my fingers, ya know....
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  #33  
Old 12-13-2004, 06:50 PM
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Quote:
Originally posted by Porter
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.
That would cause binding, This happends to the VTD system too.

I reckond you need the TCU out of a Aust, UK, or European SVX. Not out of a JDM model, they have speed limiter, which you would just hate

The Transfer TCU is playing with the C solenoid all the time. Reducing it in corners, applying it on the straight bits. If it did this with the VTD, it would cause binding coming out of corners.

Does it use a band or clutch?

Harvey.
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  #34  
Old 12-13-2004, 07:18 PM
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This is a later trans, so it has no brake band adjustment.

I have no idea whether it uses a brake band or not... I would imagine it is a clutch style as it is a later model transmission.
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  #35  
Old 12-13-2004, 07:28 PM
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Quote:
Originally posted by Porter
This is a later trans, so it has no brake band adjustment.

I have no idea whether it uses a brake band or not... I would imagine it is a clutch style as it is a later model transmission.
Porter,

If the SVX TCU doesn't work, you might want to try a TCU from a 4EAT WRX. That model uses the updated VTD trans with no brake band...

May be cheaper than sourcing a European or Aussie TCU...

-Chike

P.S. BTW, didn't get a response to the PM I sent u. Any idea what kind of power a stock 227hp 4EAT WRX puts down at the wheels?
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  #36  
Old 12-13-2004, 08:11 PM
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Quote:
Originally posted by Chiketkd
Porter,

If the SVX TCU doesn't work, you might want to try a TCU from a 4EAT WRX. That model uses the updated VTD trans with no brake band...

May be cheaper than sourcing a European or Aussie TCU...

-Chike

P.S. BTW, didn't get a response to the PM I sent u. Any idea what kind of power a stock 227hp 4EAT WRX puts down at the wheels?
I'd imagine getting a WRX TCU to work in the SVX would be a chore, from a wiring perspective alone even if the electronics are compatible, which I'm not sure of. Maybe Harvey knows more on that subject. I'll compare the wiring diagrams from the service manuals tomorrow.

Sorry for missing the PM... WRX 4EAT (02/03) makes about 162 at the wheels on a Dynapack. 04+ makes about 165-168 at the wheels on the same dyno. Results may vary significantly from these numbers on other dynos.
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  #37  
Old 12-13-2004, 10:20 PM
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I'm hoping the trans will drive without the FWD fuse connected... i.e. Solenoid C "off"... at least that would get me rolling until I could figure out an electronic fix.
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  #38  
Old 12-13-2004, 11:51 PM
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anybody have the TCU wiring diagrams!!? I'm getting good at figuring these things out.. even in foreign languages

although i'm starting to really dislike German
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  #39  
Old 12-14-2004, 05:51 AM
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I'll post them on here before noon.
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  #40  
Old 12-14-2004, 07:34 AM
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Quote:
Originally posted by Chiketkd

Porter,

If the SVX TCU doesn't work, you might want to try a TCU from a 4EAT WRX. That model uses the updated VTD trans with no brake band...

May be cheaper than sourcing a European or Aussie TCU...

-Chike
I can help ya there Jason!! I just happen to be from the city with Australia's largest Japaniese Auto Dismantler ... Go HERE!!! or call (international = from $0.99/min - $3.99/min) 011-61-8-83691156... Also here's their fax number... 011-61-8-83691194... Good lick with this stuff man!!! Would love to get out there and help if possible!!!
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  #41  
Old 12-14-2004, 07:38 AM
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Quote:
Originally posted by Porter
Sorry for missing the PM... WRX 4EAT (02/03) makes about 162 at the wheels on a Dynapack. 04+ makes about 165-168 at the wheels on the same dyno. Results may vary significantly from these numbers on other dynos.
Sweet! Merci beaucoup Porter!

I now have a baseline to shoot for tomorrow, when SVXRide and myself dyno our cars at Altered Atmosphere.

Will post results in the Mod Section...

-Chike
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  #42  
Old 12-14-2004, 08:57 AM
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What kind of dyno? Some read higher or lower.

Numbers for comparison are only useful if done on the same dyno, or the same type of dyno if they are certified as equally calibrated.
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  #43  
Old 12-14-2004, 09:16 AM
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TCU pinouts are in my locker under Transmission Project!
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  #44  
Old 12-14-2004, 10:20 AM
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Quote:
Originally posted by Chiketkd

Sweet! Merci beaucoup Porter!

I now have a baseline to shoot for tomorrow, when SVXRide and myself dyno our cars at Altered Atmosphere.

Will post results in the Mod Section...

-Chike
Chike,
couple of things to keep in the back of your head tomorrow:
1. My "baseline" back at the end of June was 158-159hp (air temp was ~80degF)
2. Assuming a 30% loss through the drivetrain you get the following:
a. 230hp@ flywheel = 161hp@wheels
b. 235 = 164.5
c. 240 = 168
d. 245 = 171.5
3. The AWD dyno at AA is a DynoJet (rollers in the floor)

-Bill (shooting for options c or d...but realizing his engine now has 186k on it....)
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Last edited by SVXRide; 12-14-2004 at 10:29 AM.
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  #45  
Old 12-14-2004, 03:13 PM
oab_au oab_au is offline
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Quote:
Originally posted by Porter
TCU pinouts are in my locker under Transmission Project!
Could not get the pics to open. But as it uses the clutch instead of the band, the normal 4eat TCU won't do it.

I remember someone posting a scan of the later TCU, and there were a few changes. They now use another sensor on the input shaft to relate the load that the converter has on it. A bit vage on it now, but if you can get the pics to open, I'll check it out.

Harvey.

Edit: it was in a .post by NormadTW called 'third gear only'. Looks like it will need the TCU from the doner car.
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Last edited by oab_au; 12-14-2004 at 03:38 PM.
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