Dccd
09-18-2003, 06:30 AM
#1
Registered User
Thread Starter
Join Date: Feb 2003
Location: NJ
Posts: 78
Car Info: 2007 WRX Sport Wagon
Dccd
I know this topic has been beaten to death, but I think I understnad how it works. Lock means the front and back tire rotate together, and free means they do not. My questons are as follows?
1. What is the advantage of being able to manually change this. (I do not race the car) What road conditions do you use what. And the manual seem to say everytime you come to a stop when you are in manual mode that you have to change it to free, and you also have to make changes at high speeds, seems like a pain in the *** to make all the changes while driving.
2. If when you are in auto mode the car changes the diif for you why do need to manuanlly change it?
3. Finaly if I don't race but drive hard and enjoy driving such a phat car when should I use the DCCD?
1. What is the advantage of being able to manually change this. (I do not race the car) What road conditions do you use what. And the manual seem to say everytime you come to a stop when you are in manual mode that you have to change it to free, and you also have to make changes at high speeds, seems like a pain in the *** to make all the changes while driving.
2. If when you are in auto mode the car changes the diif for you why do need to manuanlly change it?
3. Finaly if I don't race but drive hard and enjoy driving such a phat car when should I use the DCCD?
09-18-2003, 09:19 AM
#2
Guest
Posts: n/a
Re: Dccd
Originally posted by danny b
I know this topic has been beaten to death, but I think I understnad how it works. Lock means the front and back tire rotate together, and free means they do not. My questons are as follows?
1. What is the advantage of being able to manually change this. (I do not race the car) What road conditions do you use what. And the manual seem to say everytime you come to a stop when you are in manual mode that you have to change it to free, and you also have to make changes at high speeds, seems like a pain in the *** to make all the changes while driving.
2. If when you are in auto mode the car changes the diif for you why do need to manuanlly change it?
3. Finaly if I don't race but drive hard and enjoy driving such a phat car when should I use the DCCD?
I know this topic has been beaten to death, but I think I understnad how it works. Lock means the front and back tire rotate together, and free means they do not. My questons are as follows?
1. What is the advantage of being able to manually change this. (I do not race the car) What road conditions do you use what. And the manual seem to say everytime you come to a stop when you are in manual mode that you have to change it to free, and you also have to make changes at high speeds, seems like a pain in the *** to make all the changes while driving.
2. If when you are in auto mode the car changes the diif for you why do need to manuanlly change it?
3. Finaly if I don't race but drive hard and enjoy driving such a phat car when should I use the DCCD?
The way auto mode works is shown by this plot:
As you go into the corner, the diff is kept open, and as you go through the corner and start to power on, the diff locks up. This encourages turn in at the beginning, but prevents oversteer as you exit.
Leaving the diff open all the time will make the car turn better, but might make it oversteer some. When autocrossing, getting the car to turn as much as possible is very important. Also, since the tracks are tight, you will be less likely to need the locked DCCD to keep you from oversteering coming out of corners. Because of this many people recommend autocrossing with the diff manually set to open.
Leaving the diff locked will prevent oversteer. If you're driving on gravel, snow or other loose surfaces, the locked diff will prevent the car from oversteering and spinning as much, give better traction all around, but might not give good enough turn in.
By adjusting the diff from open to lock, you should be able to balance under/over steer. Want more turn-in? Open the diff more. Too much oversteer? move the diff towards lock.
Auto mode is good for most circumstances, but was probably tuned for working the best on the track, to get the best of both worlds out of the diff.
What I would say is leave the diff in auto, unless you think there's a reason auto might not be good enough. Also, don't run the diff at or near lock at very low speeds (less than 5 mph) when trying to turn the car.
09-18-2003, 10:50 AM
#3
Registered User
Thread Starter
Join Date: Feb 2003
Location: NJ
Posts: 78
Car Info: 2007 WRX Sport Wagon
thank you very much, I guess your last statement explains why to put the diff in open when you stop
Thread
Thread Starter
Forum
Replies
Last Post
tbonetristy
Suby Shopping & Maintenance/Warranty
0
09-07-2006 02:06 PM
