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#1
12-03-2003, 12:09 AM
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Dccd
Hi, Does anyone know how to use the DCCD function on the sti? When to use the different settings? vesus automatic setting? thanks!
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#2
12-03-2003, 11:40 AM
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Auto setting sets it to function more like the conventional AWD system. Setting it in the manual mode as in 35:65 will make it transfer more torque to the rear wheels initially than the auto setting.
Some drivers have note that the rear got a little tail happy when set in the manual mode of 35:65 f/r while starting from a stand still in snow. Setting it closer to the locking setting or setting the diff to a 50:50 front/rear made the rear less tail happy. On track days, as in road course, you'd want to experiment with the DCCD. Just remember that setting it to a 35:65 front/rear setting will make it tail happy. Drive safely! FuJi
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#3
12-03-2003, 12:02 PM
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Actually, Auto setting is nothing like how a conventional system operates.
Auto setting will change the percentage slip of the center differential depending on throttle input and feedback the ECU gets back from the wheel speed sensors on each corner of the car. Most modern AWD systems (Audi, Porsche, BMW) will tie in the ABS system to the wheelspeed sensors and apply the brakes to a slipping wheel. That having been said, in my experience auto mode creates its own set of problems, namely the balance of the car can be upset greatly (front end wash out 4 feet mid-corner) in the time the differential is changing settings. I almost always drive the car in manual mode, with the DCCD setting differing depending primarily on road conditions. What the center diff actually does requires a more detailed explanation than I can provide offf the top of my head, and though the drive ratio of the center diff remains constant, the more towards open the center diff is the more it feels like a higher percentage of power is transferred to the rear wheels. Having driven the car on track, the DCCD setting does make a noticeable differrence in the overall balance of the car, and what setting is ideal would likely vary track to track. I've only driven it on one track, but did notice that different settings were more favorable in different types of corners, and the ideal setting for a track is largely dependent on the exact track layout.
__________________
2004 Subaru Impreza WRX STI (daily driver)  1999 Mazda Miata (track car, slow, but finished the SCCA Runoffs)  1987 Porsche 944 (being rebuilt) 
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#4
12-03-2003, 01:05 PM
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Thanks. This is helpful, have never raced any courses, so I'm thinking for a daily/weekend driver automatic DCCD is fine? And if I ever do get on the track, experiment with the settings.
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#5
12-03-2003, 03:07 PM
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Re: Dccd
Auto should do you fine as a daily driver, but it all depends on your driving style. If your idea of a "daily driver" involves whipping your tail out on the odd turn, you might want a stronger rear handling bias. If you're coming from a strong FWD car, perhaps a front handling bias. I'd say experiment as you're driving.
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