uprated viscous cupplings

st185-sainz

New member
st185-sainz":17rs1zq8 said:
The following list is still active:
#1: underscore
#2: ALLensTRAC
#3: MWP
#4: mikahogl (friend)
#5: thespen
#6: cgtdream
#7: donk2k

Is anybody of the above mentioned people still interested in buying an uprated unit?!

I decided to clear my storage and make some special christmas offer. The first one who pays gets the unit for 555EUR shipped. Offer is active until 31.12.2013 23:59

Is there any interest on uprating some more units in 2014?!

Please have also a look in the marketplace section where I have a special offer for my diffmount kits.

Mario
 

Bempa

New member
Is there still interest in this? I could hopefully arrange something if there is still interest

But not from same guy

It's another source
 

underscore

Well-known member
st185-sainz":1117k3di said:
no, it is possible to change the visco without taking out the engine. If I remember correctly, the only difficulty was to get out the long shaft which goes through the unit, but finally everything worked fine! I took us around 4hrs to change it (with proper tools...)

Has anyone got any details on how to do this without removing the transmission? Any specialty tools needed? Even just where to start from would be a big help, I can find it in a parts diagram but that doesn't really show where it lives in the grand scheme of things.
 

alltracman78

Active member
You'll have to remove the transfer case, that's where the VC is.
You might be able to remove just 2/3 of the transfer case, leaving the bell shaped piece that attaches directly to the transmission.
Or you might have to remove the whole transfer case. It's been so long since I've tore one apart I can't remember specifics.

I'm assuming the long shaft he referenced is the one that usually stays with the transmission when you separate the transfer case and transmission.
 

underscore

Well-known member
Looking at the shop manual it should be able to come out with just the right side axle and right cover of the transfer case assembly taken off but I can't be sure because the manual seems to skip some steps.
 
I'm all in for an uprated VC but have been waiting on Mario to get back to me for a couple months now... Bummer!

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MWP

New member
MWP":29q4sj9c said:
What CST rating fluid are you using?

It's a shame we can't seem to get a ballpark figure for this :(
It would give a good starting point for reconditioning our VC's.
 

aus jd 2703

New member
wouldnt be to hard to bend test.

large deflection beam torque wrench rigidly mounted, other end of the coupling in the jaws of a lathe. turn at 350mm

try various silicone oil until you get about 350.
but a light oil like 1000cst to start so what the torque is and go from there.

the hard part is finding the oil, i know rc cars use up 1 000 000 cst silicone oil in their diffs but the volume is small and very expensive.
 

MWP

New member
aus jd 2703":8qi0rro6 said:
wouldnt be to hard to bend test.
....
the hard part is finding the oil, i know rc cars use up 1 000 000 cst silicone oil in their diffs but the volume is small and very expensive.

And that is the problem... sourcing the liquid.
It's too hard to get ahold of to work it out by trial & error.
 
underscore":pzfscomd said:
Would it be possible to have the fluid analyzed and see if they can determine what's equivalent?
You mean our existing fluid? I will ask and let you know... But I assume that's just to get a baseline as we would want more than an equivalent.

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Bempa

New member
There is a company in uk that has the knowledge to restore Celica VC's . I cant remember their name at the moment bit they are mainly specialist on Ford Motorsport differentials and thats what they marketing them self as. And mostly towards rally cars.

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Edit: found it, Bara Motorpsort UK
 

CMS-GT4

Active member
Just from what I read lately on whats involved in doing the VC right, I think it might be worth paying more to have a shop do it. I do not know for sure on our unit, but it seem other units are filled under pressure, and I have even read there is a bubble that is left in the system that serves a purpose.
Having looked at a lot of these cut open online I see the plates having holes in them. I wonder if there is a tunablity with the plates and holes like there is with a shock. And like a shock, I am wondering if this is not done right you can make it worse.

On the note of the location of the VC, I have wondered if there was a way to cram a clutch pack in there or something instead. The tooling may make this out of our realm as well.
I have not been able to find the link, but there used to be an imprezza blog where a person rebuilt their vc. They had shown how to test it with a torque wrench. Perhaps if anyone has a VC out of their car they can get their tq rating off it and the milage and we can do some data analysis.
 
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