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Old 01-05-2006, 02:25 AM   #1
Filthy_Sense
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Default not hooking up DCCD...pros and cons?

when doing a 6 speed swap with a DCCD tranny..would it hurt to not hook up the DCCD? what are the good and bads about it? also, can u run DCCD on a swap while still using the r160 rear end? thanks.
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Old 01-05-2006, 08:24 AM   #2
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I don't know if it's harmful, but I assume it'd just be a normal torque split without the adjustability to the rear...
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Old 01-05-2006, 08:35 AM   #3
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Without DCCD control hooked up, the trans defaults to 35/65. It's not harmful at all to run like this, but, I would prefer to have the adjustability.

Add it on later if you like.

Why wouldn't you be able to run DCCD with an R160?
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Old 01-05-2006, 01:08 PM   #4
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You're 100% fine running your transmission without the controller. You will have zero limited slip properties of the center diff, which isn't exactly ideal in rainy or snowy situations. I ran my car without a DCCD controller through plenty of rain and about 1 foot of snow without mishap, but I do have snow tires. It is pretty easy to break the rear end loose without any lock dialed in.

You can run the r160 without problems as long as you swap out the 3.54 ring and pinion for 3.90.

I'm currently running a 03 JDM Spec C tranny, a 01 impreza automatic drive shaft, 3.90's swapped into my stock r160 and a EBAY Manual DCCD controller. It works great!
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Old 01-05-2006, 01:30 PM   #5
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You can not dyno on non load based dyno's without dccd hooked up..
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Old 01-06-2006, 01:26 AM   #6
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Quote:
Originally Posted by ElmnTfrliF
You're 100% fine running your transmission without the controller. You will have zero limited slip properties of the center diff, which isn't exactly ideal in rainy or snowy situations. I ran my car without a DCCD controller through plenty of rain and about 1 foot of snow without mishap, but I do have snow tires. It is pretty easy to break the rear end loose without any lock dialed in.

You can run the r160 without problems as long as you swap out the 3.54 ring and pinion for 3.90.

I'm currently running a 03 JDM Spec C tranny, a 01 impreza automatic drive shaft, 3.90's swapped into my stock r160 and a EBAY Manual DCCD controller. It works great!

thanks. using the r160 rear end..don't u have to use the 3.90 ring and pinion anyways..even if it is non DCCD?
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Old 01-06-2006, 06:40 AM   #7
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I ran my car without a DCCD controller for 8 months, and now that the controller is hooked up I can tell you one thing: You lose out all the fun running the diff in open mode!

It is nice for track days on dry asphalt and slick tyres, but as soon as grip levels drop you REALLY miss the lost traction. Is is also a somewhat dangerous, as you get a "Dr. Jekyll and Mr. Hyde" behaviour. All is nice as long as you have no wheel spin, but when you DO the balance of the car changes abruptly from neutral to serious oversteer. Caught me out quite a few times...

Last but not least, the front Suretrac differential really comes into play when DCCD locking is increased. I almost didn't notice it without the controller, but now I can feel the Suretrac helping the front to wheels to tighten the line through corners.

-Get a DCCD controller!

Last edited by hmhaga; 01-06-2006 at 06:49 AM.
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Old 01-06-2006, 08:16 AM   #8
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Quote:
Originally Posted by Filthy_Sense
thanks. using the r160 rear end..don't u have to use the 3.90 ring and pinion anyways..even if it is non DCCD?
yes45
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Old 01-06-2006, 10:25 AM   #9
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Quote:
Originally Posted by VpointVick
Without DCCD control hooked up, the trans defaults to 35/65.

I figured it'd default to 50/50.
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Old 01-06-2006, 11:44 AM   #10
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Quote:
Originally Posted by Siper2
I figured it'd default to 50/50.
I couldn't quickly find any threads to refer you to, as there are so many threads on six speed swaps. If you look hard enough, you'll find a bunch of references to running w/o DCCD control as being 35/65.
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Old 01-06-2006, 12:41 PM   #11
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with all this being said..i too did a swap. does it matter which DCCD switch and unit u use? i did a '05 spec-c swap into MY04 wrx. i plan to use the '04 cluster as well. which years DCCD should i go with?
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Old 01-06-2006, 12:57 PM   #12
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I think the spec c is always 50/50 and does not even use the DCCD. My six speed came from a spec c and does not even have the hole where the wires would go through the transmission to the center diff. Not sure if all years are like this or not.
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Old 01-06-2006, 12:58 PM   #13
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Quote:
Originally Posted by hmhaga
I ran my car without a DCCD controller for 8 months, and now that the controller is hooked up I can tell you one thing: You lose out all the fun running the diff in open mode!

It is nice for track days on dry asphalt and slick tyres, but as soon as grip levels drop you REALLY miss the lost traction. Is is also a somewhat dangerous, as you get a "Dr. Jekyll and Mr. Hyde" behaviour. All is nice as long as you have no wheel spin, but when you DO the balance of the car changes abruptly from neutral to serious oversteer. Caught me out quite a few times...

Last but not least, the front Suretrac differential really comes into play when DCCD locking is increased. I almost didn't notice it without the controller, but now I can feel the Suretrac helping the front to wheels to tighten the line through corners.

-Get a DCCD controller!
this is very true, i actually have a manual dccd controller hooked up but i had it at 0% last night and gunned it in second, got the ass way wide like i was in a monster camaro. get a dccd controller

-mikey
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Old 01-06-2006, 01:01 PM   #14
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Quote:
Originally Posted by 95sti
I think the spec c is always 50/50 and does not even use the DCCD. My six speed came from a spec c and does not even have the hole where the wires would go through the transmission to the center diff. Not sure if all years are like this or not.

are u sure yours is the spec-c?

look here:
http://www.rallispec.com/Transmission%20chart.htm

u might have the '02 spec-c tranny.
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Old 01-06-2006, 01:35 PM   #15
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on another note...for u JDM tranny swappers. what DCCD control unit did u use etc. etc. and how did u hook it up.
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Old 01-06-2006, 05:49 PM   #16
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Quote:
Originally Posted by swift2fly
are u sure yours is the spec-c?

look here:
http://www.rallispec.com/Transmission%20chart.htm

u might have the '02 spec-c tranny.
Here's what the code comes back as:
JDM Impreza WRX STi & STi RA MY01-02 TY856WB1CA 3.636 2.375 1.761 1.346 1.062 0.842 3.545 1.000 3.900 Viscous (4kgf) A.P. Suretrac RA STi w/ 17 in. wheel
(also Prodrive Style & STi Limited MY02)

Honestly not sure what year that is but there is no center diff controller plug in which is too bad because the car I put it in has the DCCD already from the factory so it probably would have worked.
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Old 01-06-2006, 08:43 PM   #17
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use a 12V supply to switch between on and off. I have a thumb controller and I am usually full off or full on. I've tried everyting and you get 90% of the way there with only on or off. Switch if off for mellow driving. Swith it on whenever you are gunnin it and you want the traction combined with the ability to perform hockey stops

programmable controller = 1500USD
Manual controller = 500USD
12V controller = free.

You do the math
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Old 01-06-2006, 09:13 PM   #18
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I can highly recommend the Neetronics controller.

http://www.neetronics.com/neet/senso...troller-2.html

BTW: You shouldn't be running the DCCD unit on continous 12V (100% lock) for prolonged time.
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Old 01-06-2006, 09:46 PM   #19
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Quote:
Originally Posted by cronic
You can not dyno on non load based dyno's without dccd hooked up..
why is this?....
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Old 01-06-2006, 09:47 PM   #20
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Quote:
Originally Posted by hmhaga
I can highly recommend the Neetronics controller.

http://www.neetronics.com/neet/senso...troller-2.html

BTW: You shouldn't be running the DCCD unit on continous 12V (100% lock) for prolonged time.
100% lock puts it a 50/50...default is 35/65...or so it was explained to me...so not being hooked up has no power and is 35/65 split

I love RWD bias
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Old 01-07-2006, 10:38 AM   #21
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Quote:
Originally Posted by Homemade WRX
why is this?....
NM. I am an idiot, and totally mis read the question.
Nothing to see here, move along.

Last edited by VpointVick; 01-07-2006 at 03:49 PM.
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Old 01-07-2006, 10:47 AM   #22
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Quote:
Originally Posted by Homemade WRX
why is this?....
For example, Front wheels spinning at 90 mph, the rear at 130.. We have ran into this numerous times with cars with no dccd controller, on dyno Jets and dyna packs.
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Old 01-07-2006, 10:12 PM   #23
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i've been doing tons of research and i have some more questions or concerns. looks like i may go with the simplicity of manual mode only. some say running it on "full lock" for a long period of time is bad for the center diff. i can understand that and i would only use it in No Traction situations. what about using the other setting in between 0-100%, like 15%, 35% etc.? can u use that for a long period of time without any harm?
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Old 01-08-2006, 07:19 PM   #24
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Quote:
Originally Posted by hmhaga
I can highly recommend the Neetronics controller.

http://www.neetronics.com/neet/senso...troller-2.html

BTW: You shouldn't be running the DCCD unit on continous 12V (100% lock) for prolonged time.
Why? Have you studied the way the controller works? The output is simply a PWM'd or on off 12V. Full lock on the knob is 100% or straight up 12V so it stands to reason that you can simply apply the 12V with no controller. I have done it with no problems. I have measured all important parameters and see no reason to be worried.
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Old 01-09-2006, 12:10 AM   #25
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Quote:
Originally Posted by hmhaga
I can highly recommend the Neetronics controller.

http://www.neetronics.com/neet/senso...troller-2.html

BTW: You shouldn't be running the DCCD unit on continous 12V (100% lock) for prolonged time.
has anyone know someone that has bought this and used it? if so i want to know if it is easy install and if it is worth $400?

i have been in 35/65 for a long time, since summer of 2004
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