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Old 12-31-2017, 12:42 PM   #1
Racer Dave
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Default 20kg and 12kg Center Diffs Are Back!!

Check out what I found! All Drive Subaroo in Autstralia is making 20kg and 12kg center diffs brand new and they've even made some upgrades I'm told. If you're in North America, Flatirons Tuning in CO is the North American distributor. I picked up 20kg for my RS rally car and ran a short rally with it to test it out. It made a huge difference! Feel free to ask questions here or I put together a video to review it if you want to know more.
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Old 12-31-2017, 02:07 PM   #2
Racer Dave
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One question that I get asked a lot that I talk about a little in the video is what's the difference between 12kg and 20kg and which should you run. The 20 is best suited for loose surfaces such as dirt, gravel, snow and ice. It transfers a lot of torque from the front to the rear and is much closer to full time 4wd. This is ideal for rally and offroad but it's really too aggressive for street driving or racing and can make the car difficult to handle. It might be ok for a pure drag car where you're only going straight though? The 12 is much more ideal for asphalt. It will give you better power transfer than a stock unit but won't be so aggressive that it's hard to turn. Hopefully this helps!
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Old 12-31-2017, 02:22 PM   #3
JarHarms
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Well at least ADS uses the correct type of retaining ring. Although it's not indicated on ADS' website which is also pretty lack on useful photos. I can see the retaining ring used in your click video though.

ADS' RS20 is $1,100+ (ouch although the Subaru 20kg was not much cheaper) but I guess if you have to have that component and the Subaru ones are gone, there isn't much choice. If the ADS RS12 is any more than the current price of a new 38913AA102, then it's a waste of money. It is nice to have some additional options though...

Last edited by JarHarms; 12-31-2017 at 02:28 PM.
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Old 12-31-2017, 02:43 PM   #4
Racer Dave
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Used 20kg's were impossible to find and they were selling for around a grand plus you had to buy a rebuild kit or hope they worked as is. So that price seems good to me for a brand new one. And this diff made a huge difference for me in the rally. It made the car feel like it had a lot more power on the launches and pulling out of the tighter turns. I can't wait until I get some more power under the hood to get even more benefit in the higher speed turns!
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Old 01-01-2018, 04:29 PM   #5
mrsaturn7085
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The ADS parts have been available for a while now - be sure to let us know how it holds up! Great replacement for the STi part that was discontinued a few years back.
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Old 01-01-2018, 10:32 PM   #6
Racer Dave
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I will post on here for sure. I plan to have videos from all of my events this year on youtube and I'm running the entire Rally America series so it will be thoroughly tested and documented!

I'm under Racer Dave on youtube also if anyone cares to check out all the latest race videos and follow along this season.
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Old 01-03-2018, 09:47 AM   #7
Titter
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Default 20kg and 12kg Center Diffs Are Back!!

would these work in the 4EATís?

specifically phase 2 version 1 4EAT w/VTD. i plan on getting a suretrac lsd front diff and was debating upgrading the center diff as well if possible while the trans is out.
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Old 01-04-2018, 10:09 PM   #8
Racer Dave
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Quote:
Originally Posted by Titter View Post
would these work in the 4EATís?

specifically phase 2 version 1 4EAT w/VTD. i plan on getting a suretrac lsd front diff and was debating upgrading the center diff as well if possible while the trans is out.
I don't know. I'd suggest maybe a new post to see if the 4MT center diffs are the same the 4EAT's so that hopefully someone on here with more knowledge can answer. Definitely let me know what you find out though!
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Old 01-05-2018, 12:22 PM   #9
car_freak85
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Quote:
Originally Posted by Titter View Post
would these work in the 4EATís?

specifically phase 2 version 1 4EAT w/VTD. i plan on getting a suretrac lsd front diff and was debating upgrading the center diff as well if possible while the trans is out.
Your VTD diff has a native 45/55 F/R split. Keep it.
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Old 01-24-2018, 07:38 PM   #10
Winnerone23
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Quote:
Originally Posted by Titter View Post
would these work in the 4EATís?

specifically phase 2 version 1 4EAT w/VTD. i plan on getting a suretrac lsd front diff and was debating upgrading the center diff as well if possible while the trans is out.
If you upgrade from the VTD, I'll take your VTD center diff.. Help soften the cost of the ADS..
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Old 01-25-2018, 08:39 AM   #11
Titter
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gonna keep the VTD and just upgrade my front diff
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Old 02-14-2018, 09:31 PM   #12
Racer Dave
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Well...I just won snow drift overall with this diff and I honestly think this diff made the difference. Conditions were so slippery it was out of control but I was able to get a little drive out of the corners and not be all squirrelly on the straights. It was really cool feeling actually!
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Old 04-19-2018, 09:25 PM   #13
Racer Dave
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I've now raced this in the dirt a couple times as well and it's amazing! It's like driving a totally different car. It's really planted and drives really hard out of the turns. I wish I would have gotten it sooner!
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