DCCD setting for autocross

mayorofsc · 10-07-2012, 01:43 PM

Hey everyone. I've searched this but never really got a definitive answer or opinion. I have an 05' STi and I am running an autox event this weekend. Please correct me if I am wrong but from what I understand is that the DCCD in auto reacts faster than 04' because of a steering input sensor, but slower than than the 06' because they are never fully open. So for an autox event in an 05', what is the best setting for the DCCD? The conditions will be dry and mild temperatures. Thanks in advance for any advice you can give.

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Scooby South · 10-07-2012, 04:20 PM

Leave it in Auto... unless you can think faster than the computer...

Bill

'02 Subaru Rex · 10-07-2012, 04:23 PM

I set mine in the first notch and felt quicker. Of course, it was my 4th run and I was just about familiar with the track. Usually you get 6-7 runs...put it in auto for a couple, then the first notch for a couple...then report back.

Patrick Olsen · 10-07-2012, 07:34 PM

Quote:

Originally Posted by '02 Subaru Rex

Usually you get 6-7 runs...put it in auto for a couple, then the first notch for a couple...then report back.

I would say 6-7 runs is definitely not the norm - I'm used to 3 or 4. Depends on how big the club is.

With that said, I normally leave mine in AUTO. (I have an '06 6MT in my car with a Spiider controller.) Today was a wet event, so I tried full lock on my 3rd run, and full loose on my 4th run, just to see the difference. Unfortunately, I lost ABS on my 4th run, which completely blew the run, so I wasn't able to draw any conclusions.

CGMDan · 10-07-2012, 08:00 PM

For a stock DCCD I say Auto also.

I've got a Spiider controller too on my swapped GC and I run it in auto, but turned 1 notch from full aggressive. I get a fair amount of over steer with it less, but I also haven't played with it much this season.

But today we did run a VERY tight course, and I believe I did have some issues with binding.

JPotter · 10-09-2012, 04:44 PM

+1

leave it in auto

DHGurs · 10-09-2012, 11:06 PM

Manual full rear bias in the dry. Auto (-) in the wet/snow.

AustinTX · 10-10-2012, 12:20 PM

For 06+, definitely leave it in auto. For 05-, it depends. The basic advantage of the controllable center diff is that it can be opened up when off throttle to allow the front wheels to dig in and tighened up as necessary on corner exit to maintain good balance of accelleration and steering. The DCCD controller in 05 and older cars is very slow to respond and tends to throw the car sideways on exit when the diff finally engages. I spent a few events going back and forth between similarly prepped 05 and 06 STI's, and I tended to like the 05 in manual mode set 2-3 clicks from locked (meaning 2-3 clicks down from the top in the cluster). It allowed the car to exit more cleanly, but caused a bit of understeer on entry. It was pretty course dependent. It's not going to amount to much time on course if you drive it right, but it can make around 0.3-0.5 second difference when you find the right setting for the course.

The 06+ just work like magic in auto mode, as they respond much more quickly and have steering position sensors which smooth out the action very well.

10-07-2012, 01:43 PM	#1
mayorofsc Scooby Newbie Member#: 255666 Join Date: Aug 2010 Chapter/Region: Tri-State Location: 516 Vehicle: 2005 WRX STI WRB	DCCD setting for autocross Hey everyone. I've searched this but never really got a definitive answer or opinion. I have an 05' STi and I am running an autox event this weekend. Please correct me if I am wrong but from what I understand is that the DCCD in auto reacts faster than 04' because of a steering input sensor, but slower than than the 06' because they are never fully open. So for an autox event in an 05', what is the best setting for the DCCD? The conditions will be dry and mild temperatures. Thanks in advance for any advice you can give. * Registered users of the site do not see these ads.

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10-07-2012, 04:20 PM	#2
Scooby South Subtly Outspoken Moderator Member#: 238 Join Date: Sep 1999 Chapter/Region: MWSOC Location: 2013 Limited SWP BRZ and a Vehicle: 99 Ver6 Recreation JDM Speedwagon 3 LSDs..:)	Leave it in Auto... unless you can think faster than the computer... Bill

10-07-2012, 04:23 PM	#3
'02 Subaru Rex Scooby Specialist Member#: 160725 Join Date: Oct 2007 Chapter/Region: NESIC Location: Vermont Vehicle: 2005 STi WRB sittin on GOLD	I set mine in the first notch and felt quicker. Of course, it was my 4th run and I was just about familiar with the track. Usually you get 6-7 runs...put it in auto for a couple, then the first notch for a couple...then report back.

10-07-2012, 08:00 PM	#5
CGMDan Scooby Specialist Member#: 127883 Join Date: Oct 2006 Location: PDX Vehicle: '99 RSTi '05 CGM STi - RIP	For a stock DCCD I say Auto also. I've got a Spiider controller too on my swapped GC and I run it in auto, but turned 1 notch from full aggressive. I get a fair amount of over steer with it less, but I also haven't played with it much this season. But today we did run a VERY tight course, and I believe I did have some issues with binding.

10-09-2012, 04:44 PM	#6
JPotter Scooby Newbie Member#: 92604 Join Date: Aug 2005 Chapter/Region: MWSOC Location: St. Louis Vehicle: 05 WRX STi CGM	+1 leave it in auto

10-09-2012, 11:06 PM	#7
DHGurs Scooby Specialist Member#: 187414 Join Date: Aug 2008 Chapter/Region: NESIC Location: Pembroke, NH Vehicle: 2010 STi SE, Legacy, and '90 325i (SCCNH.org)	Manual full rear bias in the dry. Auto (-) in the wet/snow.

10-10-2012, 12:20 PM	#8
AustinTX Scooby Specialist Member#: 23954 Join Date: Sep 2002 Chapter/Region: TXIC Location: ATX Vehicle: 06 STI FTW '11 Legacy 3.6R	For 06+, definitely leave it in auto. For 05-, it depends. The basic advantage of the controllable center diff is that it can be opened up when off throttle to allow the front wheels to dig in and tighened up as necessary on corner exit to maintain good balance of accelleration and steering. The DCCD controller in 05 and older cars is very slow to respond and tends to throw the car sideways on exit when the diff finally engages. I spent a few events going back and forth between similarly prepped 05 and 06 STI's, and I tended to like the 05 in manual mode set 2-3 clicks from locked (meaning 2-3 clicks down from the top in the cluster). It allowed the car to exit more cleanly, but caused a bit of understeer on entry. It was pretty course dependent. It's not going to amount to much time on course if you drive it right, but it can make around 0.3-0.5 second difference when you find the right setting for the course. The 06+ just work like magic in auto mode, as they respond much more quickly and have steering position sensors which smooth out the action very well.