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Old 10-09-2005, 07:24 PM   #1
Zoso
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Default Why the change in torque split on the 06 STI?

How does going from 35/65 to 41/59 provide an improvement?
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Old 10-09-2005, 07:48 PM   #2
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It is supposed to better reflect the actual weight split between the front and rear axles.

My own personal opinion is that they moved the split closer together to increase the reaction time of the system. However, I'm not sure that I would consider the reduced range over which the DCCD can now operate as an improvement. Seems like the wider range over which it can operate, the more adaptive it can be....assuming it was fast enough to keep up with the dynamics of the vehicle.

But certainly the 41/59 split is probably optimum for most conditions.

-Michael
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Old 10-09-2005, 07:50 PM   #3
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I thought the new split was was 49/51....either way, I was suprised by it considering how much the STi understeers.
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Old 10-09-2005, 07:59 PM   #4
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Remember that they base all their tuning on the JDM models, not the American models. The new torque split has a big affect on high-speed stability, along with the revised aerodynamics. Overall, the car is quicker through high speed corners, a bit slower through low-speed corners, and is far, far more stable on real roads with mid-corner bumps and humps. I could push it further and go faster with greater confidence than the older cars. The older cars were a bit more chuckable, and probably a bit quicker, but nobody this side of a professional race driver could really take advantage of it. The first of the facelift STI's had to be manhandled so heavily into the corners that most Japanese owners didn't know how well they could actually handle, as they literally ran out of arm strength to find out.

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Old 10-09-2005, 08:18 PM   #5
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This is what I figure, some of the complaints have been the DCCD not being reacting quick enough. Like F4phantomii said, 41/59 is probably sufficient anyways (I have seen some actually like the second to last setting on the dccd).

Now in manual mode the DCCD is constantly locking up when turning, braking and accelerating. With the DCCD at only 59% RWD it can lock up and reach 45:55 or 50:50 faster than 65% RWD could. This is just my idea of why they would do this, I wouldn't go around saying this is an official reasoning but on the other hand I wouldn't be surprised if this was true.

It does seem like Subaru is trying to make the DCCD work faster, part of the reason they added sensors to detect which way the front wheels are pointed.


Quote:
Originally Posted by f4phantomii
But certainly the 41/59 split is probably optimum for most conditions.

-Michael
Also, edmunds has a little bit on it, they do mention that 41:59 better torque range:

http://www.edmunds.com/apps/vdpconta...4/pageNumber=1
"The improvements also allowed Subaru's engineers to change the standard torque split from 35-to-65 front-to-rear to 41-to-59 and give the DCCD system a greater range of torque distribution"
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Old 10-09-2005, 08:39 PM   #6
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petter said that the 06 handles much better than the previous models due to the new steering sensor and the revised dccd
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Old 10-09-2005, 08:55 PM   #7
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so did makinen

http://www.subaru.co.jp/impreza/spec...pecial_1m.html
(Get about 40% of the way through the video)
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Old 10-09-2005, 10:03 PM   #8
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Quote:
Originally Posted by wrb2006sti
petter said that the 06 handles much better than the previous models due to the new steering sensor and the revised dccd
he's hardly going to says its worse, is he?

Looking forward to some real world track times between the 05 STI and the 06 STI, suspect a slightly better time with the 06 STI, possibly 1-2 seconds?
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Old 10-09-2005, 10:21 PM   #9
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Quote:
Originally Posted by shemoves
I thought the new split was was 49/51....either way, I was suprised by it considering how much the STi understeers.

the new split is 49/51
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Old 10-09-2005, 10:39 PM   #10
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Given the fact that they have gave out very little informantion as to why they did this, maybe it was a cynical attempt to change something mechaincal so that people might buy an 06.
Had the 05 out in the rain yesterday in an autoX, and there's not much wrong with the 05 setup.
The rear bias makes the car sooo much fun to drive...
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Old 10-09-2005, 11:34 PM   #11
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Quote:
Originally Posted by gc822
the new split is 49/51
Can you post where you're getting this info from? I'm pretty sure it's 41/59.
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Old 10-09-2005, 11:37 PM   #12
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Quote:
Originally Posted by nightia
he's hardly going to says its worse, is he?

Looking forward to some real world track times between the 05 STI and the 06 STI, suspect a slightly better time with the 06 STI, possibly 1-2 seconds?
He didn't seem to think it was necessarily better then the 05 but rather different. He did mention that the 05 oversteered easier and that the 06 was more predictable and easier to drive fast, but I don't remember him actually coming out as saying it was much superior or anything like that.

I hope this mechanical DCCD turns out to be a good improvement and not something that going to suck, it is the first year for it and I'm a bit worried. Hopefully it will be succesfull and carry over to the 07+.
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Old 10-09-2005, 11:49 PM   #13
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Quote:
Originally Posted by Zoso
Can you post where you're getting this info from? I'm pretty sure it's 41/59.
You're correct, the SOA website states 41/59 split.
Quote:
..Normally, DCCD splits power 41% front and 59% rear. Sensors monitor parameters such as wheel slippage, steering angle, throttle position and braking to help determine torque distribution to the wheels with optimum traction...
'06 STI Features and Specs
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Old 10-10-2005, 12:26 AM   #14
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Jesus people thats not the limit. You could possibly set it to the same as the 05s Manually. In automatic mode however it has the new split of 41/59.

You can still goto 50/50 and 35/65, the range hasn't been changed.
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Old 10-10-2005, 01:20 AM   #15
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Quote:
Originally Posted by Master2192
Jesus people thats not the limit. You could possibly set it to the same as the 05s Manually. In automatic mode however it has the new split of 41/59.

You can still goto 50/50 and 35/65, the range hasn't been changed.
Since you seem so dissapointed with us would you care to show how this is?
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Old 10-10-2005, 02:26 AM   #16
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Quote:
Originally Posted by WRX-pilot
Since you seem so dissapointed with us would you care to show how this is?
correct me if i'm wrong, enable manual DCCD mode and spin that dccd switch up and down for the different settings...
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Old 10-10-2005, 09:08 AM   #17
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Quote:
Originally Posted by Master2192
Jesus people thats not the limit. You could possibly set it to the same as the 05s Manually. In automatic mode however it has the new split of 41/59.

You can still goto 50/50 and 35/65, the range hasn't been changed.
Guys I don't want to turn this into another DCCD torque or slip thread. The actual GEARING on the 06 STI has been changed to 41/59 and that is what I ment for this thread to focus on.

I'd also like to discuss the addtion of a mechanical LSD into the center diff. I don't get this, it has a mechanical LSD and an electronic variable one now as well?
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Old 10-10-2005, 11:47 AM   #18
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Quote:
Originally Posted by kpxplaya415
correct me if i'm wrong, enable manual DCCD mode and spin that dccd switch up and down for the different settings...
I didn't ask how to work the DCCD I asked how he knew that manual mode still allowed 65% rear since auto would only go to 59%
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Old 10-10-2005, 12:35 PM   #19
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Yes....I think the range is reduced. If it isn't, and Subaru simply changed the "nominal" split to 41/59, then the car should be better all around.

But I don't think that's what they did....I think the range on the 06's is from 50/50 to 41/59 and no further split beyond that, either in Auto or manual mode.

Anybody know?

-Michael
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Old 10-10-2005, 01:22 PM   #20
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Quote:
Originally Posted by WRX-pilot
I didn't ask how to work the DCCD I asked how he knew that manual mode still allowed 65% rear since auto would only go to 59%
haha i thought the range was still to 35/65, but i guess that's the answer we're looking for eh...
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Old 10-10-2005, 01:42 PM   #21
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Quote:
The new torque split has a big affect on high-speed stability, along with the revised aerodynamics.
I agree. Going 155mph on the highway.. I was glued to the ground
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Old 10-10-2005, 06:51 PM   #22
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he did say much better in the new drive subaru magazine. also somewhere on the web is him driving a stock 06 and drifting it and having alot of fun in it hes a great driver. he is the tarmac man well loeb had something to say about that but hey
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Old 10-10-2005, 11:40 PM   #23
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The new split has me annoyed. Mid-corner corrections accompanied by throttle lift causes a bigger change from understeer to oversteer...and getting back on the gas hard causes not only understeer again but yanks the wheel because of torgue steer. And mid-corner shifts, well you get my point. All of this in auto and not driving like I'm on the track.
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Old 10-10-2005, 11:44 PM   #24
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Quote:
Originally Posted by RexStage1
The new split has me annoyed. Mid-corner corrections accompanied by throttle lift causes a bigger change from understeer to oversteer...and getting back on the gas hard causes not only understeer again but yanks the wheel because of torgue steer. And mid-corner shifts, well you get my point. All of this in auto and not driving like I'm on the track.
I've noticed this to a small degree just everyday driving, but I'm pretty sure that if you're driving hard mid-corner throttle lifts and mid-corner shifts arent' a good idea in any car.
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Old 10-10-2005, 11:58 PM   #25
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I added the part about not on the track to reference daily driving (sorta). When driving 6 or 7/10th's on public roads where the corners have more than one apex or are sweeper like, the cars response is very drastic. It is enough of a difference from the '04 that it is always a bit of a surprise. I have not played with the manual setting, perhaps I should play with it.......the DCCD that is?
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