Go Back   Subaru Impreza Forum - WRX STI Rally Performance Tuning > Subaru-Impreza.org > General Chat - Anything about Anything

Subaru Impreza Forum

wrx sti ra dccd ??????
Reply
 
LinkBack Thread Tools Display Modes
Old 31 Oct 2008, 10:15 PM   #1 (permalink)
Fresh Scooby
 
Join Date: Aug 2005
Location: shropshire
Posts: 24
Question wrx sti ra dccd ??????

Hi to all,having been away from the scoobs for 12 months owing to my missus playing dodgems I now have a 1996 STI RA import.Any help on the Dccd i would appreciate even to the point of how it works and what does it do.Second question would be what when and why to use the water injection i understand that it goes into the intercooler but with my last car being a WRX, the new toys that i've got I need to learn how to appreciate them,
Thanks in advance Crossjoint
Offline   Reply With Quote
Old 01 Nov 2008, 12:41 AM   #2 (permalink)
Veteran Scooby
 
rikimaru's Avatar
 
Join Date: Aug 2006
Location: Sussex
Posts: 3,335
Re: wrx sti ra dccd ??????

Hi Mate,

DCCD stands for 'Driver Controlled Centre Differential". Basically it allows you to change the power distribution between front and back. With the DCCD wheel rolled fully back the DCCD is off and will give you rear wheel bias (36/64 i think I'll check). As you start rolling the wheel forward it starts moving power to the front until when you get to "LOCK" you are at an equal 50/50 split.

There is some info kicking about which I'll try and dig out now.
Offline   Reply With Quote
Old 01 Nov 2008, 12:44 AM   #3 (permalink)
Veteran Scooby
 
rikimaru's Avatar
 
Join Date: Aug 2006
Location: Sussex
Posts: 3,335
Re: wrx sti ra dccd ??????

There you go mate, have yourself a read.

Info. DCCD - Driver controlled center differential


These 2 links are also very helpful and go into a lot of detail;

http://www.type-ra.co.uk/vB/showthre...highlight=DCCD

http://www.type-ra.co.uk/vB/showthread.php?t=3814

Last edited by rikimaru; 01 Nov 2008 at 12:53 AM.
Offline   Reply With Quote
Old 01 Nov 2008, 03:49 AM   #4 (permalink)
Obsessed Scooby
 
stiimpreza1984's Avatar
 
Join Date: Jul 2008
Location: Cork, Ireland
Posts: 7,475
Re: wrx sti ra dccd ??????

GREAT read Wayne always ran mine in open diff as the senior mechanic here thats into sti's use say only ever move the control if you were in gravel or snow but say he didnt know much about it cause he heard them horrible noises when a customer didnt know much either about it some one move the dial forward more to lock when just starting off and bad bad sound must show him this, great understanding to it i would imagine with the DCCD could be strong enough to allow people to make the ODD mistake by taking off not in open mode and get that horrible sound it would not do damage for that odd time would it you think?????????

Last edited by stiimpreza1984; 01 Nov 2008 at 03:52 AM.
Offline   Reply With Quote
Old 01 Nov 2008, 04:38 AM   #5 (permalink)
Veteran Scooby
 
rikimaru's Avatar
 
Join Date: Aug 2006
Location: Sussex
Posts: 3,335
Re: wrx sti ra dccd ??????

That noise you get with the diff at full lock is diff wind and, according to Subaru at least, its not doing any damage. Usually only get the noise when cornering at slow speeds at or near full lock. I have used full lock only a couple of times whilst driving and both times when having a play in snow, in normal conditions its just horrible; steering feels heavy and that noise is horrendous unless you are hammering it. I do sometimes use full lock when launching and then roll it back to fully open once I'm at speed, you shouldn't hear any noise when using full lock in a straight line. I do roll the diff forward to the 1st orange light if im in heavy rain or on icy roads and it does make a difference to the handling and the control of the car, but apart from that it is generally in fully open mode as i like the way the car handles at that setting, especially on slightly wet roads.
Offline   Reply With Quote
Old 01 Nov 2008, 03:59 PM   #6 (permalink)
Obsessed Scooby
 
stiimpreza1984's Avatar
 
Join Date: Jul 2008
Location: Cork, Ireland
Posts: 7,475
Re: wrx sti ra dccd ??????

Quote:
Originally Posted by crossjoint View Post
Second question would be what when and why to use the water injection i understand that it goes into the intercooler

It dampens the top of the intercooler. The water will then evaporate, taking heat away from the intercooler and cooling the intake charge. It will also give you that little bit of extra horse power 1-3hp extra cause of the cooler air.......
Offline   Reply With Quote
Old 01 Nov 2008, 04:12 PM   #7 (permalink)
Obsessed Scooby
 
stiimpreza1984's Avatar
 
Join Date: Jul 2008
Location: Cork, Ireland
Posts: 7,475
Re: wrx sti ra dccd ??????

Quote:
Originally Posted by rikimaru View Post
That noise you get with the diff at full lock is diff wind and, according to Subaru at least, its not doing any damage. Usually only get the noise when cornering at slow speeds at or near full lock. I have used full lock only a couple of times whilst driving and both times when having a play in snow, in normal conditions its just horrible; steering feels heavy and that noise is horrendous unless you are hammering it. I do sometimes use full lock when launching and then roll it back to fully open once I'm at speed, you shouldn't hear any noise when using full lock in a straight line. I do roll the diff forward to the 1st orange light if im in heavy rain or on icy roads and it does make a difference to the handling and the control of the car, but apart from that it is generally in fully open mode as i like the way the car handles at that setting, especially on slightly wet roads.

I proberbly would not use the diff lock at all but played round with it earlier and the grip and feel for the power even second up the first orange is great but heard that diff wind before in an sti and its horrible be thinking your doing damage to diffs but as surbaru said it will not damage it................
Offline   Reply With Quote
Old 02 Nov 2008, 03:52 PM   #8 (permalink)
Fresh Scooby
 
Join Date: Aug 2005
Location: shropshire
Posts: 24
Re: wrx sti ra dccd ??????

Hi and many thanks for the info,it's much appreciated just need to have a play with the settings Crossjoint
Offline   Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Info. DCCD - Driver controlled center differential 2002pete Modifications - Tips and Tricks 11 17 Oct 2010 02:00 AM
DCCD what does it do? VTR Bondy Subaru Impreza Discussions 6 27 Aug 2007 10:26 AM
2006/7 DCCD System - differential question cj3 Subaru Impreza Discussions 5 06 Jan 2007 05:19 PM
DCCD vs normal on ice ? torrekens Subaru Impreza Discussions 2 07 May 2005 04:47 PM
Roger Clarke? Phill-type-R General Chat - Anything about Anything 13 02 May 2005 04:53 PM


All times are GMT. The time now is 02:25 PM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.