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Old 08-15-2003, 06:11 PM   #1
drdray
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Member#: 40759
Join Date: Jul 2003
Location: Sac, CA
Vehicle:
2004 STi
Silver/Silver

Default DCCD Question

I cant find anything in the manual about it, so thought Id ask about it here. The DCCD switch button ( the one that one would use to switch to manual from auto mode) can it be used only when car is completely stopped and in neutral? What will happen if its flipped while car is moving? Im just getting paranoid about passengers in the car. They all go wow, whats that button do? and I would hate to see the DCCD switch get flipped while moving. Any one got any input on this? May be someone with some experience with DCCDs?
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Old 08-15-2003, 06:34 PM   #2
WRX 2002
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Join Date: Oct 2001
Chapter/Region: MWSOC
Location: Gurnee IL
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2004 STi
Rally Blue

Default

You can change the DCCD controller when ever you like.
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Old 08-15-2003, 08:00 PM   #3
Janq
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Chapter/Region: MAIC
Location: Where ever I lay my hat is my
Vehicle:
1993 Legacy L+ AWD
Phoenician blue met./blue

Default Re: DCCD Question

Quote:
Originally posted by drdray
I cant find anything in the manual about it, so thought Id ask about it here. The DCCD switch button ( the one that one would use to switch to manual from auto mode) can it be used only when car is completely stopped and in neutral? What will happen if its flipped while car is moving? Im just getting paranoid about passengers in the car. They all go wow, whats that button do? and I would hate to see the DCCD switch get flipped while moving. Any one got any input on this? May be someone with some experience with DCCDs?
All you need/want to know about the DCCD is in chapter 7 of the manual.

- Janq
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Old 08-15-2003, 08:29 PM   #4
Zoso
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Join Date: Jun 2003
Vehicle:
2006 CGM STI
2000 Outback & 05 BMW M3

Default

You're obviously new here.

Do a search on DCCD.

Then go get a giant glass of your favorite beverage. You'll be reading about DCCD for hours.

After you are enlightened, go experiment with the DCCD in different situations.

After that post your observations.

Then we can discuss DCCD.
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Old 08-15-2003, 08:52 PM   #5
Janq
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Phoenician blue met./blue

Default

I forgot to answer your questions; yes you can switch it on the fly at any time or speed you like without worry.

I'll save you the time of doing a search...

The DCCD system is electrohydraulic and instantly acting.
I suggest you start out experimenting with Manual mode by keeping it at the second triangle down from "Lock" (top). Drive with it in that mode for awhiel and get used to things as its different than in AUTO mode. Also be mindful that if you slow down then go to turn or reverse you need to stick it back in AUTO mode or otherwise the diffs will lockup and make clunking sounds. No you won't break anything but it its disconcerting to hear.

For max. accelreation ability _in a straight line_ set the DCCD to manual and set the bias to the first triangle below LOCK for a maximum front axle bias. I warn you though, do not set or leave it at this setting to eneter a corner. Otherwise the front axle will lockup and it'll be tough to steer while underpower. Don't heed this warning and you will be off the road or into the car beside you.
Once under way set the bias to the third or fourth triangle from the top for even or a slight rear bias.

For max. traction of slippery surfaces (rain, wet grass, mud) set the DCCD to the top most LOCK position. This will apportion power evenly & equally to both axles and through the locking diffs to each wheel. Great/best for low traction high torque needs.

For gravel & loose dirt set the DCCD to the rear most position which is indicated by a GREEN illuminated "O" indicating the center diff is fully open and providing zero bias effect.

If you would like more information on the DCCD system and how it works in both manual & auto modes reference the following links;

* http://forums.nasioc.com/forums/show...hreadid=377278
* http://www.subaru.co.jp/impreza/sedan/05/index.html
* http://forums.nasioc.com/forums/show...hreadid=401344

To stay up to date on the who's, what's and how cool's of the STi bookmark the very cool site setup by fellow member 'WRXWhat' titled; www.USDMSTi.com

I hope this info helps answer your questions.

- Janq

P.S. I now generally motor around in manaul at setting two from the top. Also, when you trun off the car and restart it the DCCD ECU will automatically default to the AUTO mode.
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Old 08-15-2003, 09:18 PM   #6
Zoso
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2000 Outback & 05 BMW M3

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Quote:
Originally posted by Janq

I suggest you start out experimenting with Manual mode by keeping it at the second triangle down from "Lock" (top).

For max. accelreation ability _in a straight line_ set the DCCD to manual and set the bias to the first triangle below LOCK for a maximum front axle bias. I warn you though, do not set or leave it at this setting to eneter a corner. Otherwise the front axle will lockup and it'll be tough to steer while underpower. Don't heed this warning and you will be off the road or into the car beside you.

Once under way set the bias to the third or fourth triangle from the top for even or a slight rear bias.


For gravel & loose dirt set the DCCD to the rear most position which is indicated by a GREEN illuminated "O" indicating the center diff is fully open and providing zero bias effect.


P.S. I now generally motor around in manaul at setting two from the top. Also, when you trun off the car and restart it the DCCD ECU will automatically default to the AUTO mode.
OK....so when you say the "third or fourth triangle from the top" are we counting LOCK, triangle 1, triangle 2, triangle3.....or LOCK, triangle 2, triangle 3

i.e. Do we start counting LOCK as 1, then 2,3,4 OR are we counting lock as 0, and then the first triangle would be postion 1???? Please clarify, I'm confused.

Also, why do you recommend diff open for gravel, loose dirt and almost LOCK for straight line acceleration? This is oposite to most of what people say, I thought on loose dirt you would want to be closer to LOCK and for max acceleration on AUTO or diff open?????



"P.S. I now generally motor around in manaul at setting two from the top. "

So this is the second triangle under LOCK or the first? What type of road (straight, winding) Why do you like this setting?
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Old 08-16-2003, 12:25 AM   #7
Janq
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1993 Legacy L+ AWD
Phoenician blue met./blue

Default

Quote:
Originally posted by Zoso


OK....so when you say the "third or fourth triangle from the top" are we counting LOCK, triangle 1, triangle 2, triangle3.....or LOCK, triangle 2, triangle 3

i.e. Do we start counting LOCK as 1, then 2,3,4 OR are we counting lock as 0, and then the first triangle would be postion 1???? Please clarify, I'm confused.

Also, why do you recommend diff open for gravel, loose dirt and almost LOCK for straight line acceleration? This is oposite to most of what people say, I thought on loose dirt you would want to be closer to LOCK and for max acceleration on AUTO or diff open?????



"P.S. I now generally motor around in manaul at setting two from the top. "

So this is the second triangle under LOCK or the first? What type of road (straight, winding) Why do you like this setting?
I'm speaking in a literal sense regarding the triangles.
The top most setting is LOCK. Below that there are four triangle icons/indicators followed by an oval indication full open.
So when I say the third triangle I literally mean, the third triangle.

As fo diff lock settings you'll best be served to experiment for yourself. But my position on the positions is based on past experience with four wheeling in trucks with locakable diffs both electronic & air lockers. Yes, this is a car but a dif is a diff is a diff.

I'm motoring about at literally the second triangle.
I use this setting as my general all purpose setting for standing starts, rolling starts/acceleration, straight line and cornering. In corners I'm too busy & focused on the road to be fussing witht he little dial and watching the change on my gauges.

Review the links I posted, especially the third link featuring scnas of the service manual toward DCCD. That info is good stuff.

Have fun with your STi, but please be careful.

- Janq
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