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Question about SVXs AWD
I recently read a article about a australian racing team that ran the R32 skylines back before they where banned, apparently they overrode the 4wd system in favor of a manual torque adjust knob (its late i don't know how else to explain)
anyways the story talked about feeding different ohlms into the G meters and it made me wonder if something like this could be done on a SVX, what i need to know which way subaru went about setting up the 4wd sensors, did they use wheel speed sensors? or G meters etc? anyways i currently don't own a SVX but have thought about buying one a few times (had atleast 1 great test drive in a clean 95 LSi) and if i could devise a way of manually adjusting the amount of torque front to rear then i may be all over teh car again, i seriesly would like to own one of these cars someday. anyways if this idea goes kaput then ill probably just keep loving my 1st gen mr2s and alfa romeos on a bit of a off-topic question: i know the SVX is a wonderful grand tourer, but can it still be aggressive enouph that you sometime feel the need to act like a animal? Last edited by Ottobon; 03-14-2007 at 11:25 PM. |
#2
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. Earl .... ... .... ><SVX(*> Subaru Ambassador [COLOR=”silver”]1992 Tri Color L[/COLOR] ~45K (06/91) #2430 1992 Dark Teal LS-L ~184K (05/91) #0739 1992 Claret LS-L ~196K (05/91) #0831 1992 Pearl LS-L ~103K (06/91) #1680 1992 Pearl LS-L ~151K (06/91) #2229 1992 Dark Teal LS ~150K (07/91) #3098 (parts car) 1992 White LS-L ~139K (08/92) #6913 1993 25th AE ~98K (02/93) #164 1993 25th AE ~58K (02/93) #176 1993 25th AE ~107K (02/93) #215 1993 25th AE ~162K (02/93) #223 1994 Laguna Blue Pearl LSi ~124K (1/94) #2408 1994 Laguna Blue Pearl LSi ~144K (10/93) #1484 1994 Laguna Blue Pearl LSi ~68K (10/93) #1525 1994 Barcelona Red LSi ~46K (02/94) #2624 1994 Pearl LSi ~41K (12/93) #1961 1995 Bordeaux Pearl LSi ~70K (02/95) #855 1996 Polo Green LSi ~95K (03/96) #872 1997 Bordeaux Pearl LSi ~55K (08/96) #097 2003 Brilliant Red LS1 Convertible ~29K (04/03) #8951 1999 Magnetic Red LS1 Coupe ~33K (04/99) #6420 My Email | Old Locker | New Locker | Picture of 15 of the 19 |
#3
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This here topic is 'a gonna get moved.
As far as the question, the way in which our transmissions (USDM models I'm talking about here) split torque will ensure that no more than 50% of power is ever transfered to the back wheels. (front wheels are turned mechanically, rear are driven by viscous coupling (I believe) On paper there is no reason why you cannot override the signal and ensure a 50/50 split at all times. You would need to get a pinout for the TCU, and find which wire to piggyback, and what voltage to send. Excellent question btw, I'll be interested to hear more information from my fellow members. (and I'm sure I'll be corrected on at least one point.) my only concern would be premature wear. LAN (aka longassname) would be a good guy to ask about this. -Patrick
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Patrick 1995 Ebony Pearl. S.N. 0001 "Araby" JDM Power Mode Switch, Integrated GPS/Video Player 6Xk Miles. 1992 Teal - Sold to Mysvxrocks [SIGPIC][/SIGPIC] |
#4
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This is fine if you do not turn. But if you turn having the front wheels turning at the exact speed as the rears it would force one end to LOOSE traction! The front and rear wheels travel different distances in a turn. At light throttle the SVX averages about 75%FWD and 25% RWD. Floor it, or get into slippery stuff and it's 50/50.
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www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link |
#5
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Thanks for the correction, svxfiles. I knew there was something off there.
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Patrick 1995 Ebony Pearl. S.N. 0001 "Araby" JDM Power Mode Switch, Integrated GPS/Video Player 6Xk Miles. 1992 Teal - Sold to Mysvxrocks [SIGPIC][/SIGPIC] |
#6
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No problem.
It's 3:39 in the morning,,,,,Whats a life?
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www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link |
#7
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I was wondering about this myself, to go to full time 4wd instead of having it decide on it's own. I would think that all you should have to do is make it think the front tires are slipping all the time, so it will put the 50/50 into effect. I'm just not sure if this could potentially create other problems.
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*No SVX at the moment...* 1987 Winnebago Elandan 35' 2001 Yamaha Roadstar 1600 2004 Ford Excursion Eddie Bauer, 6.0litre Power Stroke Diesel - Daily Driver. Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well-preserved body, but rather to skid in sideways, scotch in one hand, body thoroughly used up, totally worn out and screaming HOOOOYA !!!!! |
#8
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The front wheels are geared, but torque is transferred through an electronically operated clutch, not a viscous coupling. When more pressure is applied to the clutch, more torque is sent to the rear. Here's a simple explanation. The car determines how much torque is sent to the rear by comparing the speed sensors in the transmission. One speed sensor watches the front wheels and the other watches the back wheels. WHen the fronts slip, it applies more pressure to send torque to the rear. When the rears slip, it backs off. The change happens before you notice it. Or, rather, it should. If the transfer clutch is worn the fronts can slip for a bit before it happens. Subaru 5MT transmissions do use viscous couplings, which require no electronics. I don't know about some of the newer, more fancy manuals like the STi, though. Since you can adjust the torque split on that one, I suspect it has an actual center diff. And, yes, I'm moving this thread to Tech Q&A. Please post in the appropriate forum. If you want to discuss modifying the transmission, well, we have another forum for that.
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2005 RX-8 Grand Touring 2005 Outback 2002 Mercedes-Benz E320 wagon END OF LINE |
#9
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In my opinion, there's no reason to wire up the solenoid so it's always providing full pressure. The TCU does a greate job on its own, so let it.
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2005 RX-8 Grand Touring 2005 Outback 2002 Mercedes-Benz E320 wagon END OF LINE |
#10
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The SVX has a LSD, which makes for it being very useful in the snow. I don't think I'd see the need for needing a switch to make the car 50/50 split.
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-Jason (8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95 Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod, svxfiles designed transmission mount (), sporting a "new" tail light bar, silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear (1977-Present) 1977 Chevrolet Corvette (81k) Silver (12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k) I have a bad feeling about this. -Obi Wan Kenobi |
#11
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It wasn't so much a need, or even desire. I was just curious if/how it would be done. In addition i hear so many people using inproper terminology, calling the AWD system 4WD, for instance. 4WD means all wheels have same power at all time, AWD is entirely different, though it seems not many know that.
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*No SVX at the moment...* 1987 Winnebago Elandan 35' 2001 Yamaha Roadstar 1600 2004 Ford Excursion Eddie Bauer, 6.0litre Power Stroke Diesel - Daily Driver. Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well-preserved body, but rather to skid in sideways, scotch in one hand, body thoroughly used up, totally worn out and screaming HOOOOYA !!!!! |
#12
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2005 RX-8 Grand Touring 2005 Outback 2002 Mercedes-Benz E320 wagon END OF LINE |
#13
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www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link |
#14
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from what i have read it would be difficult you need to be able to varry the pule telling sol. C to turn on or off.. right?
to keep it on 50/50 all time you would just need to keep power to the sol... or ground...
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- John ASE certified Master Tech W/ X1 Twin City Fleet repair, St. Paul, MN need work done? Have tools will travel
Last edited by Suby Fan; 03-15-2007 at 01:10 PM. |
#15
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make sure there is no 12v signal to sol C and you have constant 50/50 AWD... As a victim of this for the past year(i've tried everything to fix it) I wouldn't suggest it
Tom |
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