DCCD noises while driving/turning slowly

PSMBoXer · 07-07-2005, 09:49 PM

While finishing to park the car tonight (turning the wheel and barely getting on the gas).... click click ....

I read the manual and it says to expect clicks, but it wasn't just clicks, but it actually felt like that it was making it harder for the car to move foward for me to finish to park. It never does this on AUTO mode. Is this normal?

Sorry if this has been asked, but I am just worried. I guess I'll go to the dealer and have a tech drive with me to clarify.

mike_ · 07-07-2005, 09:52 PM

What setting? Anything but Auto will do this at low speeds. Very common, very well documented.

JayD707 · 07-08-2005, 11:18 AM

Yea just leave it in auto when in parking lots, or turning at stop signs..etc.

mike_ · 07-08-2005, 12:26 PM

That's binding. That's all normal and expected.
1. Don't change DCCD on the fly.
2. Use Auto for day to day driving unless there is a need for other settings (snow, ice, rain, mud, dirt, track, launch, etc).

The differential is trying to maintain its settings and it cannot due that under certain circumstances like low speed tight turns without binding.

Xman · 07-08-2005, 12:54 PM

sorry Mike, but the DCCD CAN certainly be changed on the fly. That is why it is there. Don't think you can change it while in the middle of a corner or other unsafe action, but you can most certainly adjust the settings while moving.

The multitude of other DCCD threads give tips and opinions on DCCD settings and usage as well.

***Digitalfiend*** · 07-08-2005, 01:54 PM

As everyone else has stated, in any mode other than Auto you will experience some form of binding while doing tight low speed turns. It is completely normal though it can scare the crap out of you. As Xman said, the DCCD can change on the fly. I've been playing with it while rolling towards a red light, flipping it to "open" and flooring it when green, just to feel the difference between that mode and Auto. Auto does a much better job maintaining traction in those situations.

mike_ · 07-08-2005, 01:57 PM

Quote:

Originally Posted by Xman

sorry Mike, but the DCCD CAN certainly be changed on the fly. That is why it is there. Don't think you can change it while in the middle of a corner or other unsafe action, but you can most certainly adjust the settings while moving.

The multitude of other DCCD threads give tips and opinions on DCCD settings and usage as well.

Sure you can, but that is not why it is there. It's not "meant" to be used on the fly.

***Digitalfiend*** · 07-08-2005, 02:25 PM

Quote:

Originally Posted by mike_

Sure you can, but that is not why it is there. It's not "meant" to be used on the fly.

Why not? Say you have a gravel portion of a rally stage coming up that you know works better (more predictable etc) with one of the partial lock settings? Perhaps a tarmac portion follows immediately after. You can flip from auto to partial lock before entering the gravel, then back to auto when entering the tarmac. Obviously this might not work in every situation but since the centre clutch is electromagenetically controlled, I can't see how changing it on the fly would be a bad thing.

**tcam33** · 07-08-2005, 02:41 PM

Quote:

Originally Posted by mike_

Sure you can, but that is not why it is there. It's not "meant" to be used on the fly.

Actually in auto mode it changes itself between full lock and open all the time. By placing it in manual mode you are simply disengaging the auto mode and leaving it in 1 of the different states of lock. It's not like the transfer cases of old, those were definately not to be used on the fly. If you choose you could try to duplicate the "map" of DCCD lock as you go through a corner but the Auto mode would do it much faster and better. In no way would it hurt the diff to do it. It's just not safe from a driver attention point of view. This past winter we had a snow cross, part was all snow part was dry pavement. I switched between full lock and auto during the run.

mike_ · 07-08-2005, 03:35 PM

Quote:

Originally Posted by Digitalfiend

Why not? Say you have a gravel portion of a rally stage coming up that you know works better (more predictable etc) with one of the partial lock settings? Perhaps a tarmac portion follows immediately after. You can flip from auto to partial lock before entering the gravel, then back to auto when entering the tarmac. Obviously this might not work in every situation but since the centre clutch is electromagenetically controlled, I can't see how changing it on the fly would be a bad thing.

I never said it was bad thing, just that it isn't intedned to be used that way. It obviously *can* be used ont he fly as I'm sure most have done this, but its in the street car for not quite that reason.

I believe that Subaru put it in the street car more for the tech/selling factor more than it did for the practical purposes. In steet car usage DCCD has limited benefits compared to a WRC car.

shftat6 · 07-08-2005, 08:48 PM

Despite reading a multitude of threads on the DCCD, I'll admit I still do not fully understand the proper way to use the manual feature. After reading this though, it just reinforces to me that I should leave it in AUTO.

**Siegel Racing** · 07-10-2005, 09:00 PM

I would say under normal conditions always leave it in auto.

The one disclaimer to this, which everybody whith stiff coil-over's should know. With a STIFF (over 500 lb springs) suspension on a WET road-course we found that the car had UNREAL understeer on the way into the corner, as soon as you TOUCHED the throttle, I mean even picked up the lash in the driveline the car would SNAP into oversteer. Once the tail was out, it was pretty easy to drive off the corner, but in those cases going one back from full lock (manual) made the WORLD of difference, the car was FANTASTIC like that...

That and the fact that the car is MUCH easier to drift set all the way back - not that I would know or anything

DO NOT drive it around slow tight corners in in anything other than auto or full open, unless you are on ice. The binding is NOT good for it. This is a must, if you want to play with the other settings in low-grip high slip situations (wet tracks, gravel, snow, ice etc) or straight line, fine but turning with it bound is not good for it.

SS

PSMBoXer · 10-04-2005, 11:30 PM

Ok after some months .... what is the best setting for some fun getting the rear lose sideways and still being able to bring it back?

***Digitalfiend*** · 10-04-2005, 11:38 PM

Full "open" / dial all the way to the rear. The backend comes around easier when the computer isn't controlling the diff lockup front-to-rear.

**Nachos Libres** · 10-05-2005, 12:16 AM

Yeah, just don't end up being like that guy in the video with the RWD WRX.

07-07-2005, 09:49 PM	#1
PSMBoXer Professional STI Driver Car: 05 PSM STi - SOLD Posts: 483 IWSTI Addict since: Jun 2005 Trader Rating: (4)	DCCD noises while driving/turning slowly While finishing to park the car tonight (turning the wheel and barely getting on the gas).... click click .... I read the manual and it says to expect clicks, but it wasn't just clicks, but it actually felt like that it was making it harder for the car to move foward for me to finish to park. It never does this on AUTO mode. Is this normal? Sorry if this has been asked, but I am just worried. I guess I'll go to the dealer and have a tech drive with me to clarify. This ad is not endorsed by this member. Please register or login to hide this ad.

07-10-2005, 09:00 PM	#12
Siegel Racing Authorized Vendor Car: Your STi ;) Fav Mod: Everything Location: Atlanta Posts: 1,330 IWSTI Addict since: Mar 2005 Trader Rating: (2)	I would say under normal conditions always leave it in auto. The one disclaimer to this, which everybody whith stiff coil-over's should know. With a STIFF (over 500 lb springs) suspension on a WET road-course we found that the car had UNREAL understeer on the way into the corner, as soon as you TOUCHED the throttle, I mean even picked up the lash in the driveline the car would SNAP into oversteer. Once the tail was out, it was pretty easy to drive off the corner, but in those cases going one back from full lock (manual) made the WORLD of difference, the car was FANTASTIC like that... That and the fact that the car is MUCH easier to drift set all the way back - not that I would know or anything DO NOT drive it around slow tight corners in in anything other than auto or full open, unless you are on ice. The binding is NOT good for it. This is a must, if you want to play with the other settings in low-grip high slip situations (wet tracks, gravel, snow, ice etc) or straight line, fine but turning with it bound is not good for it. SS Last edited by Siegel Racing; 07-10-2005 at 09:04 PM.

10-05-2005, 12:16 AM	#15
Nachos Libres Moderator Elite Car: 2005 Subaru WRX STi Fav Mod: Underglows Location: Tyler, Texas Posts: 8,939 IWSTI Addict since: Jul 2005 Trader Rating: (0)	Yeah, just don't end up being like that guy in the video with the RWD WRX. This ad is not endorsed by this member. Please register or login to hide this ad.

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07-07-2005, 09:52 PM	#2
mike_ The Next Petter Solberg Car: Lightning Red STI Location: Westchester County, NY Posts: 924 IWSTI Addict since: May 2004 Trader Rating: (0)	What setting? Anything but Auto will do this at low speeds. Very common, very well documented.

07-08-2005, 11:18 AM	#3
JayD707 Junior STI Driver Car: 2004 Aspen White STi Fav Mod: Soon to be AST coilovers Location: North of the Golden Gate Posts: 89 IWSTI Addict since: Jul 2004 Trader Rating: (0)	Yea just leave it in auto when in parking lots, or turning at stop signs..etc.

07-08-2005, 12:26 PM	#4
mike_ The Next Petter Solberg Car: Lightning Red STI Location: Westchester County, NY Posts: 924 IWSTI Addict since: May 2004 Trader Rating: (0)	That's binding. That's all normal and expected. 1. Don't change DCCD on the fly. 2. Use Auto for day to day driving unless there is a need for other settings (snow, ice, rain, mud, dirt, track, launch, etc). The differential is trying to maintain its settings and it cannot due that under certain circumstances like low speed tight turns without binding.

07-08-2005, 12:54 PM	#5
Xman S204 Racer Car: Blue 2004 STi Fav Mod: 2001 2.5RS Rally car... Location: Rancho Santa Margarita, C Posts: 2,822 IWSTI Addict since: Apr 2003 Trader Rating: (3)	sorry Mike, but the DCCD CAN certainly be changed on the fly. That is why it is there. Don't think you can change it while in the middle of a corner or other unsafe action, but you can most certainly adjust the settings while moving. The multitude of other DCCD threads give tips and opinions on DCCD settings and usage as well.

07-08-2005, 01:54 PM	#6
*Digitalfiend* Super Moderator Car: 08 DGM STI Fav Mod: My wife :) Location: Brooklin, Ontario Posts: 5,842 IWSTI Addict since: Oct 2003 Trader Rating: (0)	As everyone else has stated, in any mode other than Auto you will experience some form of binding while doing tight low speed turns. It is completely normal though it can scare the crap out of you. As Xman said, the DCCD can change on the fly. I've been playing with it while rolling towards a red light, flipping it to "open" and flooring it when green, just to feel the difference between that mode and Auto. Auto does a much better job maintaining traction in those situations.

07-08-2005, 08:48 PM	#11
shftat6 Spec C Club Car: 04 Focus SVT Location: Clermont, FL Posts: 1,473 IWSTI Addict since: Apr 2005 Trader Rating: (1)	Despite reading a multitude of threads on the DCCD, I'll admit I still do not fully understand the proper way to use the manual feature. After reading this though, it just reinforces to me that I should leave it in AUTO.

10-04-2005, 11:30 PM	#13
PSMBoXer Professional STI Driver Car: 05 PSM STi - SOLD Posts: 483 IWSTI Addict since: Jun 2005 Trader Rating: (4)	Ok after some months .... what is the best setting for some fun getting the rear lose sideways and still being able to bring it back?

10-04-2005, 11:38 PM	#14
*Digitalfiend* Super Moderator Car: 08 DGM STI Fav Mod: My wife :) Location: Brooklin, Ontario Posts: 5,842 IWSTI Addict since: Oct 2003 Trader Rating: (0)	Full "open" / dial all the way to the rear. The backend comes around easier when the computer isn't controlling the diff lockup front-to-rear.