SVX Network Forums Live Chat! SVX or Subaru Links Old Lockers Photo Post How-To Documents Message Archive SVX Shop Search |
IRC users: |
#16
|
||||
|
||||
Re: The Ultimate SVX Transmission Swap Thread
The screen which gets clogged is actually in the transmission cooler in the older model radiators not the transmission itself. The latter model transmissions just have different transfer clutches and high clutch hubs. Subaru revised the high clutch hub several times. The very early SVX transmissions (the first part of the first year) also had a smaller reverse clutch.
Discounting a clogged cooler, it's actually the slipping of the high clutch that causes the heat rather than visa versa. I think it's important to note that this problem can now be eliminated by updating the TCU. There are individual line pressure control maps for each gear but in the stock programming Subaru used the same map for all 4 gears. It works fine for 1st and 2nd which use much, much larger clutch packs than 3rd and 4th but the line pressure is marginal to not good enough to hold the little high clutch under light cruise. This results in the transmission equivalent of driving with your brakes on, continuously wearing the high clutch and brake band and making huge amounts of heat. The stock programming results in about 65 lbs of line pressure at light cruise; I change it to close to the max pressure resulting in about 150 lbs of line pressure. This change is the fix for the transmission failures that plague all SVXs. Quote:
|
#17
|
|||
|
|||
Re: The Ultimate SVX Transmission Swap Thread
Generic trans swap question:
I've finally tracked down a local and reasonably priced 4.44 setup. My question however is, what else will I need in advance of swapping this out? My goal is to have every part necessary on hand before I attempt to tackle this. Barring any unforseen circumstances that is. For instance, since the exhaust needs to come off, I assume I'll need new exhaust gaskets. Is that an accurate assumption? Which ones should I have on hand? What other sundry little tidbits should I acquire beforehand? |
#18
|
||||
|
||||
Re: The Ultimate SVX Transmission Swap Thread
Quote:
Are you planning on pulling the motor/trans from the top, or dropping the trans? If you need to do some serious engine maintenance (valve cover gaskets for example) it might be a good idea to go ahead and pull the engine, since it's not that difficult.
__________________
'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project '97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod Now a mod "over there" ............Photo album |
#19
|
|||
|
|||
Re: The Ultimate SVX Transmission Swap Thread
Quote:
Fluids are a given. What I'm looking for is a comprehensive list of the small non-intuitive things that have to be replaced. I obviously can't plan for every bolt or bracket that I might break, but things like the exhaust gaskets came to mind immediately. So far: Exhaust gaskets. - Do I just need the exhaust manifold ones, or will I need ones for the flanges further down the line too? Rear main seal - I'll check my records first just to verify this wasn't done when I had the engine out recently. What else? |
#20
|
||||
|
||||
Re: The Ultimate SVX Transmission Swap Thread
Trans mount?
__________________
"That which can be asserted without evidence can be dismissed without evidence." '92 Dark Teal SVX LS-L, >146,000m 3 pedals, 5 speeds., restoration underway. 2012 Honda Insight, slow but cute. |
#21
|
||||
|
||||
Re: The Ultimate SVX Transmission Swap Thread
|
#22
|
||||
|
||||
Re: The Ultimate SVX Transmission Swap Thread
Quote:
__________________
'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project '97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod Now a mod "over there" ............Photo album |
#23
|
|||
|
|||
Re: The Ultimate SVX Transmission Swap Thread
Quote:
I'm simply looking for a comprehensive list of things that are needed to go along with the swap. |
#24
|
||||
|
||||
Re: The Ultimate SVX Transmission Swap Thread
It will make your awd work correctly. It will also prevent the immediate high clutch and brake band wear that would start as soon as you put that transmisison in an SVX.
__________________
Michael Emery, MBA, MS 94 SVX LSI, Ebony Pearl profile 94 SVX LSI, Ebony Pearl from back Performance and Multi-Fuel Tuning Last edited by longassname; 03-23-2011 at 04:20 PM. |
#25
|
||||
|
||||
Re: The Ultimate SVX Transmission Swap Thread
It actually won't fix the speedometer. It will just fix the calculations based on speed sensor 1 input in the tcu software.
|
#26
|
||||
|
||||
Re: The Ultimate SVX Transmission Swap Thread
Quote:
Compared to the stock transmission, my daughters 92 with 4.44 trans. speedometer is off by about 6% on the high side, also has rather abrupt part throttle 1 st to 2nd shift with mushy 2-3rd shift. Will the 4.44 TCU correct this condition?
__________________
Cheers! Gordon 1997 Ebony #308 113k "The Black Diva"SOLD 1992 Black over Liquid Silver 152k SOLD 1992 Ebony 251k 444 SOLD 1999 Silver SLK230 134k SOLD 1997 Green Outback 137k SOLD 2013 Honda Accord I4 SOLD 2015 Subaru Crosstrek 30k 2018 Tesla M3 30k |
#27
|
||||
|
||||
Re: The Ultimate SVX Transmission Swap Thread
It won't effect the speedometer at all. I'm not sure if it will effect your shifts or not. The only change between the 4.44 version of the tcu chip and the regular tcu chip is to correct the vehicle speed sensor 1 reading. The foremost effect of which is to make the awd work optimally.
|
#28
|
||||
|
||||
Re: The Ultimate SVX Transmission Swap Thread
I think these swaps are for 4-eat ACT-4 but what swaps are possible if you have 4eat VTD ?
__________________
svx my94 vtd EUDM -custom Spax coilovers |
#29
|
||||
|
||||
Re: The Ultimate SVX Transmission Swap Thread
That I don't know. As far as I know Nevin is the only one to swap a VTD trans into a USDM SVX, can anyone confirm that?
__________________
Jon 1997 SVX LSi Bordeaux Pearl 1995 SVX L AWD Polo Green - 277k miles 1986 Pontiac Fiero 3.4L Twin Dual Cam V6 |
#30
|
||||
|
||||
Re: The Ultimate SVX Transmission Swap Thread
He already has a VTD svx.
You can do any of the manual swaps into a VTD SVX, but the USDM automatics are a no-go. You would want to put another VTD trans in it.
__________________
'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project '97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod Now a mod "over there" ............Photo album |
|
|