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02-20-2019, 10:08 AM | #1 |
Scooby Newbie
Member#: 322267
Join Date: Jun 2012
Location: Boston, MA
Vehicle:2005 STI |
ABS Disabled with DCCD - 2005 STI
I've done quite a bit of searching and haven't nailed down an answer. Car is a 2005 STI. Background is that I have been racing on the Ice/Lakes and need to disable ABS for obvious reasons. For the past year, I have been pulling the ABS fuse in the main fuse box under the hood to accomplish this. It's unclear to me if there is a actually a way to get the DCCD to work 100% with ABS in a disabled state. Ultimately, I don't care if Auto mode works when I'm on the ice. I am only concerned with the ability to turn the DCCD manually all the way to the rear (down on the dash). At one point over the past weekend, I got stuck in a snowbank (). I put the DCCD in lock mode and my buddy confirmed 100% that one wheel wasn't spinning at all, that to me is fishy and I wondering if my DCCD is not really working with the ABS disabled.
Any help is appreciated. Thanks in advance.
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02-20-2019, 10:40 AM | #2 | |
Scooby Newbie
Member#: 378119
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E. Canada
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Vehicle:2004 Impreza WRX World Rally Blue |
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02-20-2019, 10:55 AM | #3 |
Scooby Newbie
Member#: 322267
Join Date: Jun 2012
Location: Boston, MA
Vehicle:2005 STI |
Sure it is possible. If it helps to add context nothing is worn on this car and if I do that test it does bind as expected. That also doesn't answer my question regarding the ABS system.
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02-20-2019, 11:53 AM | #4 |
Scooby Specialist
Member#: 175624
Join Date: Mar 2008
Chapter/Region:
MWSOC
Location: Wichita, KS
Vehicle:0304 WRX WRX SY WRB |
It kinda does. Turn off ABS, get on dry tarmac, lock center diff and see if it binds while turning, if so DCCD works with ABS turned off. This may not be true, I don't know, it's just one way to test it.
That's likely not why only one of your front wheels was spinning (or the wrong front wheel was spinning). The front diff in the 05-07 STI 6 speed is a torque sensing (TORSEN) unit which will allow a wheel to free spin if there's no torque on it (wheel in the air or on ice.) The next time you're in a snow bank, try dragging the brakes lightly to create a torque on that wheel and in turn allow the diffs to send torque to the other wheel(s). |
02-20-2019, 12:32 PM | #5 | |
Scooby Newbie
Member#: 322267
Join Date: Jun 2012
Location: Boston, MA
Vehicle:2005 STI |
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02-20-2019, 01:05 PM | #6 |
Scooby Specialist
Member#: 375462
Join Date: Dec 2013
Chapter/Region:
NWIC
Location: Portland, OR
Vehicle:2006 Impreza WRX STI WR Blue |
With OEM DCCD control, the TCM and ABS computer are married to each other. If any codes are triggered in the ABS computer, DCCD control will default to open as a failsafe.
The correct answer to OP's question is that you must leave ABS electronically active to keep DCCD functioning correctly. You need to disable it hydraulically by bypassing the lines. The ABS system has no way of knowing that you've taking the ABS motors out of the hydraulic loop. Some aftermarket DCCD controllers will 'work' without wheel speed inputs (which are provided by ABS on the factory system)... but you lose a lot of control by not having wheel speed input in the DCCD closed loop control. If you just want manual control of locking percentage, you can use nearly any aftermarket system and rip the entire ABS system out. |
02-20-2019, 01:27 PM | #7 | |
Scooby Newbie
Member#: 322267
Join Date: Jun 2012
Location: Boston, MA
Vehicle:2005 STI |
Quote:
Thank you for clarification. Yes, I may install DCCDPro to try solve this but that won't be realistic for a few months. I guess my question is (out of curiosity) is what state that would put the DCCD in if the ABS is disabled? -Confused? -Partially working? -Completely off? |
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10-22-2020, 03:02 PM | #8 |
Scooby Newbie
Member#: 322267
Join Date: Jun 2012
Location: Boston, MA
Vehicle:2005 STI |
Bumping this back up as I would still like to solve this and have a clean abs delete.
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10-22-2020, 09:33 PM | #9 | |
Scooby Specialist
Member#: 30804
Join Date: Dec 2002
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SWIC
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THIS! You may also be able to bypass the stock DCCD controller and just install a switch to manually lock the diff. Look up on here how the DCCD system works. IIRC, you can just ground the connection and it will lock. |
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10-23-2020, 11:51 AM | #10 |
Scooby Newbie
Member#: 322267
Join Date: Jun 2012
Location: Boston, MA
Vehicle:2005 STI |
Any links to DIY or kits to accomplish the bypassing of the abs lines?
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