vrfour_nz
(Junior Member)
10/29/08 02:21 AM
Ralliart viscous coupling revealed..

If any of you run plate lsd's front and rear in your VR4,you will know that understeer can be a issue..especially on tarmac with rally tyres The ralliart viscous coupling RA737828A1 is what I have used in my rally car..given details on the box +30% 23.1KGf/100rpm,has transformed the car when pointing into corners!
u


bazeng
(work in progress)
10/29/08 07:29 AM
Re: Ralliart viscous coupling revealed..

Very nice!

Can you take more pics on the other side also?

Did you get it new and how much?


G
(JDM Unit)
10/29/08 12:32 PM
Re: Ralliart viscous coupling revealed..

Is that ra # the part #?

Bimmubishi
(giant log)
10/29/08 12:49 PM
Re: Ralliart viscous coupling revealed..

Yes G, it is. 600 Euros! Brace yoself.

Bimmubishi
(giant log)
10/29/08 01:26 PM
Re: Ralliart viscous coupling revealed..

Anyone know anything about this one?



G
(JDM Unit)
10/29/08 06:21 PM
Re: Ralliart viscous coupling revealed..

What's that #? xd ????

**DONOTDELETE**
(Unregistered)
10/29/08 06:31 PM
Re: Ralliart viscous coupling revealed..

the million dollar question is.... where can i get one?? i do live about 45min away from dsg.. hook it up alex

Dialcaliper
(Flagration Member)
10/29/08 07:00 PM
Re: Ralliart viscous coupling revealed..

That's awesome. $780 at the current exchange rate is cheap compared to a plate or helical center diff, or about comparable if you throw in the cost of a 4-spider - is that price delivered to your shop or the catalog price from Britain?

Also, +30% would mean a brand new OEM VCU is 17.8kgf/100rpm, before it degrades

Our final drive/front diff ratio is 3.545 compared to the WRX's 3.9, but even still, that's miles better than the stock, or even the moderate "STI" VCUs (10kgf and 12kgf - ours would be the equivalent of a 16kgf (21kgf for the Ralliart unit compared to the 20kg JDM STI VCU) due to the gearing difference. The stock subaru VCUs are really pretty pathetic it sounds like.


**DONOTDELETE**
(Unregistered)
10/29/08 07:05 PM
Re: Ralliart viscous coupling revealed..

click

i just found that link... hmmm anyone have a ralliart catalog with parts for the vr4?

"At Text Spares, we stock thousands of Mitsubishi Ralliart Parts right at your fingertips. You can now search for your own Mitsubishi Ralliart Car Parts Online, order them, and have them delivered directly to your door without leaving the comfort of your armchair."

thats what i am talking about.. ill pay to get whatever shipped from the uk.


kartorium
(hillbilly racer)
10/30/08 01:47 PM
Re: Ralliart viscous coupling revealed..

^^sorry dude, not gonna happen. You're not gonna find any ralliart parts at that place.

bazeng
(work in progress)
10/30/08 05:22 PM
Re: Ralliart viscous coupling revealed..

I'll chase it up with Ralliart Australia...
See how we go...


vrfour_nz
(Junior Member)
10/30/08 06:31 PM
Re: Ralliart viscous coupling revealed..

This could be a early Group A viscous..I remember the motorsport viscous couplings being numbered like this
Quoting Bimmubishi:

Anyone know anything about this one?






vrfour_nz
(Junior Member)
10/30/08 06:41 PM
Re: Ralliart viscous coupling revealed..

The ralliart part number actually refers to a Evo 1-3 CD-CE9A Lancer Group N viscous coupling..I can enquire with ralliart nz if anyone is interested..

3rdstrikedsm
(Now mandatory for Wendy's Chili to come with cheese)
10/30/08 06:48 PM
Re: Ralliart viscous coupling revealed..

check with Adam at devo tuning he used to deal with them. I remember one he had in his shop. He also knows where to send them to have them altered.

**DONOTDELETE**
(Unregistered)
10/30/08 06:53 PM
Re: Ralliart viscous coupling revealed..

why not just get a clutch type?

**DONOTDELETE**
(Unregistered)
06/20/09 08:51 PM
Re: Ralliart viscous coupling revealed..

Just came arcoss this thread and was wondering if anybody can tell me what mine is. I had been told it may be a ralliart unit. The numbers on it are XD373828. It also has 92.4.21 no.5 on it.

Can anybody help?

Thanks


Bimmubishi
(giant log)
06/23/09 11:18 PM
Re: Ralliart viscous coupling revealed..

I have a Ralliart one in my dogbox. It might still be different than the above one since there is a motorsport version as well as a upgraded street version. The one in my box won't physically fit onto the syncronized box shaft. It is too wide.

**DONOTDELETE**
(Unregistered)
08/04/09 07:42 AM
Re: Ralliart viscous coupling revealed..

Any news on this ? im in the market for one of these are they still available or does anybody have a second hand one for sale ?

**DONOTDELETE**
(Unregistered)
08/04/09 08:01 AM
Re: Ralliart viscous coupling revealed..

Are these still available ? im in the market for one dooes anybody want to sell one ????

**DONOTDELETE**
(Unregistered)
11/14/09 01:24 AM
Re: Ralliart viscous coupling revealed..

I have also heard of people making their stock VCU stiffer.
How exactly is this done? And who does this service? These things are sealed right? Not sure how such a thing can be performed really. In fact I doubt the info - although I have heard of it more than once, so I guess it's worth asking.


vrfour_nz
(Junior Member)
12/31/09 09:20 AM
Re: Ralliart viscous coupling revealed..

yeh i might have a few in a box somewhere,i'll have to dig and have a look if you're still keen

turboaddict
(Barnes)
12/31/09 06:00 PM
Re: Ralliart viscous coupling revealed..

I have seen a pic of a clutch lsd that fits in the stock vicous location. Has any see or know anything about these???
Thanks


cheekychimp
(Director of Housing and Urban Development, and carbon/kevlar balls)
12/31/09 09:15 PM
Re: Ralliart viscous coupling revealed..

The Cusco centre clutch diff has a machined ring that eliminates the oem viscous coupler.

turboaddict
(Barnes)
01/11/10 02:52 AM
Re: Ralliart viscous coupling revealed..

so no one has an idea on the vc replacement? Would something like that be beneficial? A clutchpack replacement for th vc or would this be a waste of time? thanks.

cheekychimp
(Director of Housing and Urban Development, and carbon/kevlar balls)
03/07/10 02:56 AM
Re: Ralliart viscous coupling revealed..

Raising this from the dead.

Anyone who has used one of these or simply understands the physics of these a little more can you spell out why they work to counteract understeer? Am I correct in assuming they require more of a torque split front rear before locking up and therefore let the rear end go more before transferring power forward allowing the car to rotate further before 'catching' the tailslide.

If so, would one of these work well in conjunction with a centre differential that offered a rear biased split?


**DONOTDELETE**
(Unregistered)
03/18/10 10:30 PM
Re: Ralliart viscous coupling revealed..

^^+1! I'd like to hear more on this. I've been digging around here looking for all the info I can on alternatives for center diffs. So far the Cusco tarmac diff + stock VCU looks like a great option. How does the ralliart VCU affect front end push?

**DONOTDELETE**
(Unregistered)
03/25/10 07:07 PM
Re: Ralliart viscous coupling revealed..

That depends on what's causing the front push.

cheekychimp
(Director of Housing and Urban Development, and carbon/kevlar balls)
05/15/10 12:09 AM
Re: Ralliart viscous coupling revealed..

Bringing this back because I found a another unicorn.

I recently found a thread on tuners about a Japanese built adjustable clutch plate coupler that replaces the stock VCU. The description seems to suggest that it does pretty much the same as the Ralliart VCU except that the plates inside the housing can be adjusted so that the user can change how much torque is sent to the rear.



Apparently they were discontinued a while back but a contact of mine somehow talked them into to reproducing one for me but on the proviso that I make a decision to move on it quickly. It's not cheap (120,000 yen) but with Ralliart gone or on the way out, this may be the last thing available to do what I want. Apparently this came out of an EVO III transmission. Does anyone know if there is any difference between our couplers and those used in early EVO units?


**DONOTDELETE**
(Unregistered)
05/15/10 12:42 AM
Re: Ralliart viscous coupling revealed..

No difference Paul. They will slide right on.

Is there another one of those avalible? If so, how much U.S. dollars?


cheekychimp
(Director of Housing and Urban Development, and carbon/kevlar balls)
05/15/10 01:14 AM
Re: Ralliart viscous coupling revealed..

Chris thanks,

About $1300 USD, I am sure if they are doing one they would do two, yes!


**DONOTDELETE**
(Unregistered)
05/15/10 09:42 AM
Re: Ralliart viscous coupling revealed..

That is way out of my league. Let us know how it works though.


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