93 BC 6speed awd swap
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- Fourth Gear
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93 BC 6speed awd swap
I'm looking for a parts list so I can price this out. I'm picking my legacy up in a week and want this done before winter. It needs an exhaust and a few other things anyway so might as well do it while it's still off the road
Blue 94GT dead and steadily parting out.
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Re: 93 BC 6speed awd swap
Why do you want to do a 6-speed swap? It'll add over 100lbs to the car. Not worth it IMO.
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Re: 93 BC 6speed awd swap
Gearing towards a future sti swap
Blue 94GT dead and steadily parting out.
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Re: 93 BC 6speed awd swap
Ebay has lots of complete swaps for sale. for example:
http://www.ebay.com/itm/2004-SUBARU-IMP ... 02&vxp=mtr
If you're using the rear diff you also need the rear axles and hubs. The pre-04 is 5x100, 05-07 is 5x114, and 08+ rear uprights don't work.
Ideally you get one that has struts, hubs, brakes, clutch/flywheel, shifter, and clutch hydraulics.
http://www.ebay.com/itm/2004-SUBARU-IMP ... 02&vxp=mtr
If you're using the rear diff you also need the rear axles and hubs. The pre-04 is 5x100, 05-07 is 5x114, and 08+ rear uprights don't work.
Ideally you get one that has struts, hubs, brakes, clutch/flywheel, shifter, and clutch hydraulics.
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Re: 93 BC 6speed awd swap
It's a bc so it's fwd lol need the rear diff hubs and axles anyway as well as supports for the rear diff, I like 5 speed, aand that's what i'm driving now. I suppose i'm more curious about the 6 speed than anything... IK it adds weight and all but aren't the lower gears geared lower than the 5 speed for better takeoff and such?
Blue 94GT dead and steadily parting out.
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Re: 93 BC 6speed awd swap
Check out this thread
http://bbs.legacycentral.org/viewtopic.php?f=7&t=49917
Regarding the gear ratios, the overall top end is roughly the same, it's how the gearing is spaced out. Check out this spreadsheet with info on the different ratios. You will be doing more shifting with the 6spd since the gearing isn't as tall.
http://main.experiencetherave.com/subar ... Ratio.xlsx
http://bbs.legacycentral.org/viewtopic.php?f=7&t=49917
Regarding the gear ratios, the overall top end is roughly the same, it's how the gearing is spaced out. Check out this spreadsheet with info on the different ratios. You will be doing more shifting with the 6spd since the gearing isn't as tall.
http://main.experiencetherave.com/subar ... Ratio.xlsx
Josh
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
Re: 93 BC 6speed awd swap
I personally would research some JDM STI 5-speed gearboxes and go with that. Shorter ratios, less weight, more fun. And if you get lucky and find one with DCCD. Even more fun.
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Re: 93 BC 6speed awd swap
So what is DCCD? Srry I'm a newb. I am mechanically inclined but haven't researched all of my options yet. I can build a beast of a comp w/ no trouble though lol
Blue 94GT dead and steadily parting out.
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Re: 93 BC 6speed awd swap
DCCD = Driver Controlled Center Differential
Instead of a viscous coupling in the center diff, it uses a solenoid to adjust the amount of lock in the center diff. Without any lock, it usually exhibits around a 45/55 split.
Instead of a viscous coupling in the center diff, it uses a solenoid to adjust the amount of lock in the center diff. Without any lock, it usually exhibits around a 45/55 split.
Josh
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
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Re: 93 BC 6speed awd swap
So you're saying variable torque to the rear end instead of 90/10 or 50/50? Looks like I know what I'll be looking into
Blue 94GT dead and steadily parting out.
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
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- Fourth Gear
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Re: 93 BC 6speed awd swap
Btw, what happened w/ the carbon hoods and trunks?
Blue 94GT dead and steadily parting out.
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Re: 93 BC 6speed awd swap
Yes, it would be variable between 45/55 and 50/50. That's not a huge range, but does provide some adjustment and rearward bias under normal conditions.
I'm not sure what happened with the hoods & trunks....I wasn't really involved with that.
I'm not sure what happened with the hoods & trunks....I wasn't really involved with that.
Josh
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
Re: 93 BC 6speed awd swap
With a standard open diff the split is 50:50 all the time. As you give the diff more lockup (or a viscous coupling or other slip limiting device), it has more potential to have a greater torque bias. So a fully locked diff can have a 100:0 or 0:100 split depending on traction. I am not quite sure of the limits of what a locked dccd can do, but if you are on snow for example it could easily send 100% of the torque to either the front or rear.
You may want to re-think this project though. A 6-speed and sti swap will end up costing something like $10k. For that money you could buy a pretty nice wrx. I at least hope your legacy is in VERY good condition.
You may want to re-think this project though. A 6-speed and sti swap will end up costing something like $10k. For that money you could buy a pretty nice wrx. I at least hope your legacy is in VERY good condition.
Last edited by jamal on Fri Sep 21, 2012 9:48 pm, edited 1 time in total.
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- Fourth Gear
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Re: 93 BC 6speed awd swap
Texan car perfect body thick factory undercoat
Blue 94GT dead and steadily parting out.
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
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- Fourth Gear
- Posts: 1037
- Joined: Wed Sep 19, 2012 3:58 am
- Location: Plaistow,NH
Re: 93 BC 6speed awd swap
I will be taking pics next week when I go pick it up it's gorgeous
Blue 94GT dead and steadily parting out.
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
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- Fourth Gear
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Re: 93 BC 6speed awd swap
Wouldn't even consider it if it wasn't pristine
Blue 94GT dead and steadily parting out.
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
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- Fourth Gear
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Re: 93 BC 6speed awd swap
Bump
Blue 94GT dead and steadily parting out.
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Re: 93 BC 6speed awd swap
No. Variable lock. Not variable torque split. You can vary the amount of slip allowed between the front and rear. The actual power split of the differential itself will always be the same (45:55 or 36:64 depending on the year).Someperson wrote:So you're saying variable torque to the rear end instead of 90/10 or 50/50? Looks like I know what I'll be looking into
93 Touring Wagon (EJ20G 5spd Swap) -- Finally back and running strong as ever!
05 Outback 2.5XT 5spd -- Now the wife can have her SUV and get in on the turbo Legacy goodness at the same time.
05 Outback 2.5XT 5spd -- Now the wife can have her SUV and get in on the turbo Legacy goodness at the same time.
Re: 93 BC 6speed awd swap
James is right. The torque split always stays equal, the DCCD allows you to vary the amount of lock between front and rear which limits the amount of slippage of the center diff.
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Re: 93 BC 6speed awd swap
Which years are 45:55? Not really down w/ finding a GC8 prob gonna stay with the 6 speed as I like the spacing of the gears
Blue 94GT dead and steadily parting out.
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Re: 93 BC 6speed awd swap
The torque split does change. But with the dccd dial you are not actually changing it. What you change is the potential torque split.
If you have a 35:65 diff set to full open, then yes, the torque distribution is going to be 35:65 all the time, no matter what. However, once you start to lock the diff the torque split will be dependent on traction and the amount of lockup. Take my example above- if the front wheels are on ice and the rear wheels are on pavement and the diff is locked, when you start accelerating the actual torque split is going to be nearly 0:100 because all the available traction is at the rear end.
Your options for a USDM transmission are going to be the early 04-05 box with a 35:65 split, or the 06+ with a 41:59 default bias. The later transmissions also have a mechanical lsd built into the diff so it can't actually be set to fully open.
If you have a 35:65 diff set to full open, then yes, the torque distribution is going to be 35:65 all the time, no matter what. However, once you start to lock the diff the torque split will be dependent on traction and the amount of lockup. Take my example above- if the front wheels are on ice and the rear wheels are on pavement and the diff is locked, when you start accelerating the actual torque split is going to be nearly 0:100 because all the available traction is at the rear end.
Your options for a USDM transmission are going to be the early 04-05 box with a 35:65 split, or the 06+ with a 41:59 default bias. The later transmissions also have a mechanical lsd built into the diff so it can't actually be set to fully open.
Last edited by jamal on Sat Oct 06, 2012 5:47 am, edited 1 time in total.
Re: 93 BC 6speed awd swap
A locked differential doesn't do any torque-biasing. Torque gets biased as a result of traction differences at the tires, but that's irrelevant to what you have in your drivetrain (in this instance). A motorcycle wheel can technically vary torque between 0% or 100% depending on traction at the tire, but that doesn't tell you anything about what the drivetrain is doing.
The important aspect of a locked differential is that is forces the wheels to rotate at the same speed. Open differential = the easier to spin wheel spins faster proportional to how much less traction is has. Fully locked = all wheels being rotated together, think of an ATV stick axle with a ring gear welded to it. The inside wheel(s) will drag in corners because they're traveling different distances but are forced to travel the same speed
WRX 4spd, as well as most 5spd, automatics have a fully automated version of the same type of differential.
The important aspect of a locked differential is that is forces the wheels to rotate at the same speed. Open differential = the easier to spin wheel spins faster proportional to how much less traction is has. Fully locked = all wheels being rotated together, think of an ATV stick axle with a ring gear welded to it. The inside wheel(s) will drag in corners because they're traveling different distances but are forced to travel the same speed
WRX 4spd, as well as most 5spd, automatics have a fully automated version of the same type of differential.
93 Touring Wagon (EJ20G 5spd Swap) -- Finally back and running strong as ever!
05 Outback 2.5XT 5spd -- Now the wife can have her SUV and get in on the turbo Legacy goodness at the same time.
05 Outback 2.5XT 5spd -- Now the wife can have her SUV and get in on the turbo Legacy goodness at the same time.
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- Fourth Gear
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- Joined: Wed Sep 19, 2012 3:58 am
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Re: 93 BC 6speed awd swap
This is a pretty big project and I'm coming to grips with it... Car has been sitting for 2 years and it looks like I need to at least do an oil pan on the engine before winter... Will be posting more pics today and tomorrow in my intro hi all. And what sub frames bolt right in these cars? I really don't want to machine any adapters for the arms and hubs
Blue 94GT dead and steadily parting out.
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Re: 93 BC 6speed awd swap
I don't really want to argue about how differentials work here but what I think helps is visualizing what happens at the extremes- open diff vs a spool.
If you're putting on a new pan you should get one from a newer sti. It has a better shape and baffling.
If you're putting on a new pan you should get one from a newer sti. It has a better shape and baffling.
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Re: 93 BC 6speed awd swap
Prob gonna have to tear into it to look at the internals, I'll post a pick of the gunk on the dipstick, not pretty, no knocks, clunks or even ticks tho so prob just gonna tear it down and do all the seals and there's a cable coming from where the clutch cable attaches to the tranny, and then a cable from there between the mani then to a spring. The clutch pedal isn't retracting... Any easy fixes? Penetrating oil on the spring/ hinge? New other cable?
Blue 94GT dead and steadily parting out.
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...
Silver 93 Fwd N/A sedan undergoing repairs
93 Winestone TW project
92 SS scrapped by my landlord...