VDC, DCCD, and SI-DRIVE Explained! (Great Info) - Page 2

***Spaceman*** · 04-06-2008, 08:35 AM

Quote:

Originally Posted by BlueF

From last month's DRIVE mag. : )

A lot of the new STi owners won't see that magazine.

kujo · 04-10-2008, 01:05 PM

so, is this correct on the 2008s ?

DCCD in Manual mode
with no bars, it's a 35F/65R torque split ?
Making the car the most rear biased possible ?

speeddoc74 · 04-11-2008, 08:14 PM

Actually,
I think the max rear torque bias can be is 59% in the '08s.

Giant · 04-17-2008, 02:20 PM

Idea's anybody...What would be the most economical settings for the VDC & DCCD combo. I do 95 miles a day to and from work...I flash the economy map for the work week,then reflash stage1 for the week end.

Thanks

Photothug · 05-03-2008, 06:44 AM

VCCD on Auto and I Drive is my guess. Haven't owned the car long enough to give personal advice though. Man...this car is smarter than I thought. That drive article was good though. For once they have a good article in there, instead of the normal, "great picnics to take with your dog in your Baja".

thanks for the links and stuff.

Wales Garage · 05-03-2008, 02:34 PM

why isnt this a sticky?

**Digitalfiend** · 05-03-2008, 02:53 PM

I didn't even notice this thread before but it should definitely be a sticky, so I'm going to make it stick.

fry_ed · 05-03-2008, 02:56 PM

well, the article's explanation of DCCD is pretty horrible....

The DCCD in [-], or with the minimum # of bars allowed, fixes the torque split at 41/59, essentially, while allowing the front to rotate at a speed which is independent of the rotational speed of the rears. Like the article says, this is good for spirited driving on high traction surfaces, good for tight turns (like, oh, doughnuts for example

). Bad for driving out of a ditch.

The DCCD in [+], or in LOCK, essentially fixes the fronts and rears such that they must rotate at the same speed, essentially, allowing the torque split to be as much as 100/0 if the fronts are on tarmac and the rears are on ice, for example. Like the article says, this is good for slippery surfaces. Bad for canyon carving.

If left in AUTO, under normal driving conditions, the car will just default to OPEN ( [-] or minimum # of bars) if you're turning, and LOCK if you're driving in a straight line. Manually putting it in OPEN is going to be better for mpg, as well as benefiting drivetrain longevity.
What is best for racing is debatable.

OK, now someone else elaborate on the SI-Drive and VDC portions of the article...ha...

**Digitalfiend** · 05-03-2008, 03:33 PM

It seems the DCCD info is actually referring to the '05 setup.

The Sim · 05-04-2008, 07:03 PM

*edit: already discussed*

The Sim · 05-04-2008, 07:04 PM

Quote:

Originally Posted by Digitalfiend

It seems the DCCD info is actually referring to the '05 setup.

The first article he posted above is for the 2008 STI. The other was from the earlier system, and the SI-Drive info was for the 2007 Legacy / Outback... but the general principles are all the same.

speeddoc74 · 05-13-2008, 07:07 PM

Quick question about the SI drive while driving...

This may sound VERY newbie, but am I supposed to be able to change the SI drive mode (S to S#, I to S#, etc) during actual driving? I thought it was supposed to be locked out while the car was in gear/moving, and only adjustable when in neutral or stopped.

**Digitalfiend** · 05-13-2008, 07:10 PM

Yes, that is the point of SI drive.

Quote:

Originally Posted by speeddoc74

Quick question about the SI drive while driving...

This may sound VERY newbie, but am I supposed to be able to change the SI drive mode (S to S#, I to S#, etc) during actual driving? I thought it was supposed to be locked out while the car was in gear/moving, and only adjustable when in neutral or stopped.

Subw00er · 05-13-2008, 07:12 PM

Its totally fine to change it during driving.

Quote:

Originally Posted by speeddoc74

Quick question about the SI drive while driving...

This may sound VERY newbie, but am I supposed to be able to change the SI drive mode (S to S#, I to S#, etc) during actual driving? I thought it was supposed to be locked out while the car was in gear/moving, and only adjustable when in neutral or stopped.

speeddoc74 · 05-13-2008, 07:13 PM

OK. Thank you.

04-10-2008, 01:05 PM	#17
kujo Junior STI Driver Fav Mod: Coming Soon Posts: 53 Join Date: Dec 2007 Trader Rating: (0)	Re: VDC, DCCD, and SI-DRIVE Explained! (Great Info) so, is this correct on the 2008s ? DCCD in Manual mode with no bars, it's a 35F/65R torque split ? Making the car the most rear biased possible ?

04-11-2008, 08:14 PM	#18
speeddoc74 Amateur STI Driver Car: drkgrymtalc 08WRXSTI Fav Mod: Coming Soon Posts: 16 Join Date: Mar 2008 Trader Rating: (0)	Re: VDC, DCCD, and SI-DRIVE Explained! (Great Info) Actually, I think the max rear torque bias can be is 59% in the '08s.

04-17-2008, 02:20 PM	#19
Giant Junior STI Driver Car: Silver 08 WRX STi Fav Mod: Mud Flaps/AP Stage 1 Location: Eastern Sierra,Ca Posts: 82 Join Date: Mar 2008 Trader Rating: (0)	Re: VDC, DCCD, and SI-DRIVE Explained! (Great Info) Idea's anybody...What would be the most economical settings for the VDC & DCCD combo. I do 95 miles a day to and from work...I flash the economy map for the work week,then reflash stage1 for the week end. Thanks

05-03-2008, 06:44 AM	#20
Photothug Amateur STI Driver Car: Black 08 STi Fav Mod: Cobb access port Location: Flagler Beach Posts: 33 Join Date: Apr 2008 Trader Rating: (0)	Re: VDC, DCCD, and SI-DRIVE Explained! (Great Info) VCCD on Auto and I Drive is my guess. Haven't owned the car long enough to give personal advice though. Man...this car is smarter than I thought. That drive article was good though. For once they have a good article in there, instead of the normal, "great picnics to take with your dog in your Baja". thanks for the links and stuff.

05-03-2008, 02:34 PM	#21
Wales Garage Junior STI Driver Car: 08 OBP STi Fav Mod: Boobies........oh, for a car Boost Location: Hunting DrewBears<3 Posts: 118 Join Date: Nov 2007 Trader Rating: (0)	Re: VDC, DCCD, and SI-DRIVE Explained! (Great Info) why isnt this a sticky?

05-03-2008, 02:53 PM	#22
Digitalfiend Super Moderator Car: 08 DGM STI Fav Mod: My wife :) Location: Brooklin, Ontario Posts: 5,093 Join Date: Oct 2003 Trader Rating: (0)	Re: VDC, DCCD, and SI-DRIVE Explained! (Great Info) I didn't even notice this thread before but it should definitely be a sticky, so I'm going to make it stick.

05-03-2008, 02:56 PM	#23
fry_ed Junior STI Driver Fav Mod: student Location: Los Angeles Posts: 172 Join Date: Feb 2004 Trader Rating: (0)	Re: VDC, DCCD, and SI-DRIVE Explained! (Great Info) well, the article's explanation of DCCD is pretty horrible.... The DCCD in [-], or with the minimum # of bars allowed, fixes the torque split at 41/59, essentially, while allowing the front to rotate at a speed which is independent of the rotational speed of the rears. Like the article says, this is good for spirited driving on high traction surfaces, good for tight turns (like, oh, doughnuts for example ). Bad for driving out of a ditch. The DCCD in [+], or in LOCK, essentially fixes the fronts and rears such that they must rotate at the same speed, essentially, allowing the torque split to be as much as 100/0 if the fronts are on tarmac and the rears are on ice, for example. Like the article says, this is good for slippery surfaces. Bad for canyon carving. If left in AUTO, under normal driving conditions, the car will just default to OPEN ( [-] or minimum # of bars) if you're turning, and LOCK if you're driving in a straight line. Manually putting it in OPEN is going to be better for mpg, as well as benefiting drivetrain longevity. What is best for racing is debatable. OK, now someone else elaborate on the SI-Drive and VDC portions of the article...ha...

05-03-2008, 03:33 PM	#24
Digitalfiend Super Moderator Car: 08 DGM STI Fav Mod: My wife :) Location: Brooklin, Ontario Posts: 5,093 Join Date: Oct 2003 Trader Rating: (0)	Re: VDC, DCCD, and SI-DRIVE Explained! (Great Info) It seems the DCCD info is actually referring to the '05 setup.

05-04-2008, 07:03 PM	#25
The Sim Junior STI Driver Car: DGM 08 WRX STI w/Nav Fav Mod: Howard Stern on Sirius Satellite Radio! Location: Monroe, CT Posts: 114 Join Date: Mar 2008 Trader Rating: (0)	Re: VDC, DCCD, and SI-DRIVE Explained! (Great Info) edit: already discussed

05-13-2008, 07:07 PM	#27
speeddoc74 Amateur STI Driver Car: drkgrymtalc 08WRXSTI Fav Mod: Coming Soon Posts: 16 Join Date: Mar 2008 Trader Rating: (0)	Re: VDC, DCCD, and SI-DRIVE Explained! (Great Info) Quick question about the SI drive while driving... This may sound VERY newbie, but am I supposed to be able to change the SI drive mode (S to S#, I to S#, etc) during actual driving? I thought it was supposed to be locked out while the car was in gear/moving, and only adjustable when in neutral or stopped.

05-13-2008, 07:13 PM	#30
speeddoc74 Amateur STI Driver Car: drkgrymtalc 08WRXSTI Fav Mod: Coming Soon Posts: 16 Join Date: Mar 2008 Trader Rating: (0)	Re: VDC, DCCD, and SI-DRIVE Explained! (Great Info) OK. Thank you. This ad is not endorsed by this member. Please register or login to hide this ad. Last edited by speeddoc74 : 05-13-2008 at 07:14 PM. Reason: o