DCCD and ABS
08-17-2004, 04:49 PM
#1
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Location: MD
Posts: 136
Car Info: 2003 WRX, blue
DCCD and ABS
is it possible to sawp from usdm 5-speed mt with abs to a jdm 6-speed mt with DCCD and keep the abs? I have heard that the abs causes problems with the DCCD?
08-18-2004, 07:00 PM
#2
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Car Info: 1993/2000/2001 GF4 mostly red
The DCCD requires speed sensor inputs from the ABS system. Installing the DCCD won't affect your ABS, but I am not certain if the signals are the same from the speed sensor of both cars.
11-13-2004, 11:53 PM
#3
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Location: Delta, BC, Canada
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Car Info: 2000 Impreza 2.5RS BRP
This is what I think
1) ABS works best when the center diff is open
2) manual DCCD isn't necessarily open all the time (in fact most leave it at a certain percentage lockup)
3) The first DCCD tranny that works ABS comes with an auto mode (in the New Age STi), and require input from ABS
4) From all that I have read, older DCCD controller don't support ABS, and the new DCCD-A controller will keep the center diff open when ABS is active
So it looks like DCCD or ABS, but not both unless you have the whole TCU/ECU from an STi V8. The main reason for ABS needing to have the center diff open seems to be that if the diffs are not open and a wheel lock up, it might caused all other wheels to lock up, which makes it difficult for the ABS to detect vehicle speed (thus a G-sensor is needed on AWD vehicle with ABS). I'm not sure if that's enough of a reason why we just don't see DCCD w/ABS until recently.
On a side note, all I wanted was a 35:65 center LSD, but DCCD seems to be the only diff that has this property (Cusco Tarmac diff is open, other aftermarket diffs are all 50:50). My other guess is that upgrading to the 12kg/20kg STi center diff could seriously affect how ABS works given that they are more likely to lock.
1) ABS works best when the center diff is open
2) manual DCCD isn't necessarily open all the time (in fact most leave it at a certain percentage lockup)
3) The first DCCD tranny that works ABS comes with an auto mode (in the New Age STi), and require input from ABS
4) From all that I have read, older DCCD controller don't support ABS, and the new DCCD-A controller will keep the center diff open when ABS is active
So it looks like DCCD or ABS, but not both unless you have the whole TCU/ECU from an STi V8. The main reason for ABS needing to have the center diff open seems to be that if the diffs are not open and a wheel lock up, it might caused all other wheels to lock up, which makes it difficult for the ABS to detect vehicle speed (thus a G-sensor is needed on AWD vehicle with ABS). I'm not sure if that's enough of a reason why we just don't see DCCD w/ABS until recently.
On a side note, all I wanted was a 35:65 center LSD, but DCCD seems to be the only diff that has this property (Cusco Tarmac diff is open, other aftermarket diffs are all 50:50). My other guess is that upgrading to the 12kg/20kg STi center diff could seriously affect how ABS works given that they are more likely to lock.
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