Do all New Age STIs have DCCD?
17 December 2014, 12:37 PM
#3
Hey mate, you can see all JDM models with DCCD here
http://www.type-ra.com/impreza-model...php?query=dccd
http://www.type-ra.com/impreza-model...php?query=dccd
17 December 2014, 12:57 PM
#7
I'm weighing things up.
Any tell tale signs on a new age that it's a JDM when looking at photos etc? I can live without DCCD if the car still has a more rear biased torque split in all honesty. The one shape I haven't yet owned is a Bug Eye....
Any tell tale signs on a new age that it's a JDM when looking at photos etc? I can live without DCCD if the car still has a more rear biased torque split in all honesty. The one shape I haven't yet owned is a Bug Eye....
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17 December 2014, 01:23 PM
#9
I don't want to push the budget that high so it won't be a JDM Blob or Hawk. Simple as that really. I'm just at that point with my Wagon where I either spend a lot of money modding further, or I buy an STI. I've pretty much decided that I want an STI again, but unless I wait another 6 months I won't be spending more than £7k.
And I don't have the patience to wait 6 months and not spend money on my wagon. It's a curse!
And I don't have the patience to wait 6 months and not spend money on my wagon. It's a curse!
17 December 2014, 01:31 PM
#11
I don't want to push the budget that high so it won't be a JDM Blob or Hawk. Simple as that really. I'm just at that point with my Wagon where I either spend a lot of money modding further, or I buy an STI. I've pretty much decided that I want an STI again, but unless I wait another 6 months I won't be spending more than £7k.
And I don't have the patience to wait 6 months and not spend money on my wagon. It's a curse!
And I don't have the patience to wait 6 months and not spend money on my wagon. It's a curse!
We've seen so many people on here all buy a WRX then want an STI, or buying a UK car then wanting it to be a JDM
17 December 2014, 01:35 PM
#12
Yeah I do get that.... I dunno. Need to think about it. I might say screw it and buy an M3 yet. I would prefer to stay Subaru though. I miss my old STI 
I don't have 2.5 hang ups either as mine was one 125k and still going strong when I sold it.
I don't really want to make an STI be anything else though. If I buy a non widetrack car, it won't kill me. I've got past all that these days, worrying about not having the very best thing available etc.
I don't have 2.5 hang ups either as mine was one 125k and still going strong when I sold it.
I don't really want to make an STI be anything else though. If I buy a non widetrack car, it won't kill me. I've got past all that these days, worrying about not having the very best thing available etc.
17 December 2014, 02:33 PM
#14
DCCD varies the slip limiting, which in turn varies the amount of torque that can be redistributed via the center diff. The native torque bias of the planetary gearset in the diff is 35f/65r (04 and 05) and 41f/59r (06+), and the only time you can really be sure exactly what the torque bias is would be when the DCCD is set to full OPEN, meaning no slip limiting and no torque transfer (note: the 06+ has an additional mechanical LSD in the center diff that cannot be turned off).
Dialing in more DCCD lock does not direectly 'vary' the torque bias. What it does is prevent the front and rear from going different speeds and if there IS a speed difference, torque is transferred through the slip plates to the slow side to bring it up to the same speed as the faster side. The amount of torque transferred is dependent on two things:
-the difference in traction(and speed) between front and rear
-the amount of lock dialed in with the DCCD dial (or the amount commanded by the automatic mode).
It is possible, under extreme conditions to have all the torque transferred to the front or the rear, but this does NOT mean what most might take it as. It means that if one side of the car has 0 traction, the other side of the car gets ALL the torque transferred to it. This is exactly how you want AWD to work and represents the state of the art in performance AWD systems.
Dialing in more DCCD lock does not direectly 'vary' the torque bias. What it does is prevent the front and rear from going different speeds and if there IS a speed difference, torque is transferred through the slip plates to the slow side to bring it up to the same speed as the faster side. The amount of torque transferred is dependent on two things:
-the difference in traction(and speed) between front and rear
-the amount of lock dialed in with the DCCD dial (or the amount commanded by the automatic mode).
It is possible, under extreme conditions to have all the torque transferred to the front or the rear, but this does NOT mean what most might take it as. It means that if one side of the car has 0 traction, the other side of the car gets ALL the torque transferred to it. This is exactly how you want AWD to work and represents the state of the art in performance AWD systems.
17 December 2014, 02:48 PM
#15
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DCCD varies the slip limiting, which in turn varies the amount of torque that can be redistributed via the center diff. The native torque bias of the planetary gearset in the diff is 35f/65r (04 and 05) and 41f/59r (06+), and the only time you can really be sure exactly what the torque bias is would be when the DCCD is set to full OPEN, meaning no slip limiting and no torque transfer (note: the 06+ has an additional mechanical LSD in the center diff that cannot be turned off).
Dialing in more DCCD lock does not direectly 'vary' the torque bias. What it does is prevent the front and rear from going different speeds and if there IS a speed difference, torque is transferred through the slip plates to the slow side to bring it up to the same speed as the faster side. The amount of torque transferred is dependent on two things:
-the difference in traction(and speed) between front and rear
-the amount of lock dialed in with the DCCD dial (or the amount commanded by the automatic mode).
It is possible, under extreme conditions to have all the torque transferred to the front or the rear, but this does NOT mean what most might take it as. It means that if one side of the car has 0 traction, the other side of the car gets ALL the torque transferred to it. This is exactly how you want AWD to work and represents the state of the art in performance AWD systems.
Dialing in more DCCD lock does not direectly 'vary' the torque bias. What it does is prevent the front and rear from going different speeds and if there IS a speed difference, torque is transferred through the slip plates to the slow side to bring it up to the same speed as the faster side. The amount of torque transferred is dependent on two things:
-the difference in traction(and speed) between front and rear
-the amount of lock dialed in with the DCCD dial (or the amount commanded by the automatic mode).
It is possible, under extreme conditions to have all the torque transferred to the front or the rear, but this does NOT mean what most might take it as. It means that if one side of the car has 0 traction, the other side of the car gets ALL the torque transferred to it. This is exactly how you want AWD to work and represents the state of the art in performance AWD systems.
This has baffled me, the center differential deals with torque split front/rear, you then have a front and rear diff that deal with cross axle torque, the dccd doesnt do that which reading this implies it does or did you miss a little bit out?
Tony
17 December 2014, 02:58 PM
#16
Where did you read the DcCd transfers torque left to right?
17 December 2014, 03:22 PM
#17
From what I read DCCD is a diff locking device, not a bias device. Hence you adjust it from fully open to fully closed (locked)
Power will always remain split in the same percentage front to back, unless traction is lost somewhere
Power will always remain split in the same percentage front to back, unless traction is lost somewhere
17 December 2014, 05:38 PM
#19
Scooby Senior
what's DCCD?
17 December 2014, 06:20 PM
#22
17 December 2014, 06:21 PM
#23
Didn't audi have a locking centre diff back in the 80's? (Yes)
That they superseded with a proper torsen diff like the one in my gearbox.
I know it's not electronicly controlled, but does it need to be? Probably not, that's why the majority of AWD cars don't have one
That they superseded with a proper torsen diff like the one in my gearbox.
I know it's not electronicly controlled, but does it need to be? Probably not, that's why the majority of AWD cars don't have one
Last edited by boosted; 17 December 2014 at 06:23 PM.
17 December 2014, 06:26 PM
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17 December 2014, 07:39 PM
#26
Audi however use basically the same system As subaru in their a4/a6 type quattro system, centre diff like an impreza.
Last edited by boosted; 17 December 2014 at 07:43 PM.
17 December 2014, 07:41 PM
#27
So if you jacked up three wheels (or put them on ice) how much of the available torque goes to the remaining one wheel?
17 December 2014, 09:35 PM
#30
Well the wife is on the same line of thought as me, either STI or M3 next.
If I go M3 I'll get an A4 Quattro as my next daily. If I go STI I'll go BMW as my next daily most likely.
I've decided I will go wide track after all, but I'm not going to stretch to a JDM. Seen a nice Hawk STI and a couple of nice Blobs within budget. I like the Hawk best, but I do worry that eventually the engine may give me hassle. It's not enough of a worry to stop me buying one if I thought it was the right car though.
If I go M3 I'll get an A4 Quattro as my next daily. If I go STI I'll go BMW as my next daily most likely.
I've decided I will go wide track after all, but I'm not going to stretch to a JDM. Seen a nice Hawk STI and a couple of nice Blobs within budget. I like the Hawk best, but I do worry that eventually the engine may give me hassle. It's not enough of a worry to stop me buying one if I thought it was the right car though.