uprated viscous cupplings

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Re: uprated viscous cupplings

Postby st185-sainz » Thu Nov 17, 2016 8:17 pm

Would have one in stock ready for shipping. Setting 350Nm@50RPM
Unit goes in exchange for 900EUR shipped worldwide.

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Re: uprated viscous cupplings

Postby underscore » Sun Apr 08, 2018 5:23 am

st185-sainz wrote: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.
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Re: uprated viscous cupplings

Postby alltracman78 » Mon Apr 09, 2018 1:33 am

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.
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Re: uprated viscous cupplings

Postby underscore » Mon Apr 09, 2018 4:04 am

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.
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Re: uprated viscous cupplings

Postby MWP » Fri Jun 08, 2018 6:50 am

st185-sainz wrote:Would have one in stock ready for shipping. Setting 350Nm@50RPM


What CST rating fluid are you using?
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Re: uprated viscous cupplings

Postby eric thompson » Wed Nov 28, 2018 3:14 am

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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Re: uprated viscous cupplings

Postby BNZ » Sun Feb 24, 2019 9:14 pm

Same here. No reply
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Re: uprated viscous cupplings

Postby MWP » Mon Mar 11, 2019 5:04 pm

MWP wrote: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.
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Re: uprated viscous cupplings

Postby aus jd 2703 » Thu Mar 14, 2019 4:59 am

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.
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Re: uprated viscous cupplings

Postby aus jd 2703 » Thu Mar 14, 2019 5:08 am

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Re: uprated viscous cupplings

Postby MWP » Thu Mar 14, 2019 12:59 pm

aus jd 2703 wrote: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.
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Re: uprated viscous cupplings

Postby underscore » Fri Mar 15, 2019 1:11 pm

Would it be possible to have the fluid analyzed and see if they can determine what's equivalent?
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Re: uprated viscous cupplings

Postby eric thompson » Fri Mar 15, 2019 1:18 pm

underscore wrote: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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Re: uprated viscous cupplings

Postby Bempa » Sat Mar 16, 2019 5:51 am

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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Re: uprated viscous cupplings

Postby CMS-GT4 » Sat Mar 16, 2019 2:49 pm

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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