uprated viscous cupplings

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Re: uprated viscous cupplings

Postby tubasteve » Thu Dec 16, 2010 4:48 am

sounds like it is fubard.

as it heats up it should grab more and more as you stated.
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Re: uprated viscous cupplings

Postby gtfour77 » Thu Dec 16, 2010 1:25 pm

If you guys look at the diagram, the front wheels(front diff) are working first...then the power gets transmitted to the center diff (open)...once that strats to slip it gets transmitted to the Viscous Coupling, and only then... which in turn drives the rear wheels. You'd have to stop the front wheels to see if the VC is working and unless you have an LSD you'd have to apply even pressure to the rear wheels too... it's best to take it out and measure the torque required to spin it. The one I have out of the car is probably in the 120-150ft/lbs ...very stiff. (with nice clear fluid inside) I have two god units if anyone needs one by the way. From what I have read it's fairly easy to take it out if you only remove the transfer case right cover. From looking at mine, they are really, really well made and last a very long time IMHO, doubt yours is bad but you never know until you test it ;)
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Re: uprated viscous cupplings

Postby tubasteve » Fri Dec 17, 2010 4:18 am

gtfour77 wrote:If you guys look at the diagram, the front wheels(front diff) are working first...then the power gets transmitted to the center diff (open)...once that strats to slip it gets transmitted to the Viscous Coupling, and only then... which in turn drives the rear wheels. You'd have to stop the front wheels to see if the VC is working and unless you have an LSD you'd have to apply even pressure to the rear wheels too... it's best to take it out and measure the torque required to spin it. The one I have out of the car is probably in the 120-150ft/lbs ...very stiff. (with nice clear fluid inside) I have two god units if anyone needs one by the way. From what I have read it's fairly easy to take it out if you only remove the transfer case right cover. From looking at mine, they are really, really well made and last a very long time IMHO, doubt yours is bad but you never know until you test it ;)


not calling you out, just saying how i saws it :P if im wrong dont beat me too hard.

'when there is a difference in speed from the front(main driven wheel[unless wrong]) it causes the vc to heat up the fluid inside causing the power to be added more and more to the rear until 'locked' or they start to have equal speed thus cooling the fluid inside and losening the tight on the rear.'

"if you guys look at the diagram"

did i miss this? :shock: if so help me.

-tubasteve
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Re: uprated viscous cupplings

Postby sleeper » Fri Dec 17, 2010 7:18 am

gtfour77 wrote:If you guys look at the diagram, the front wheels(front diff) are working first...then the power gets transmitted to the center diff (open)...once that strats to slip it gets transmitted to the Viscous Coupling, and only then... which in turn drives the rear wheels. You'd have to stop the front wheels to see if the VC is working and unless you have an LSD you'd have to apply even pressure to the rear wheels too... it's best to take it out and measure the torque required to spin it. The one I have out of the car is probably in the 120-150ft/lbs ...very stiff. (with nice clear fluid inside) I have two god units if anyone needs one by the way. From what I have read it's fairly easy to take it out if you only remove the transfer case right cover. From looking at mine, they are really, really well made and last a very long time IMHO, doubt yours is bad but you never know until you test it ;)



You should make a guide on how to take this item out in a fast\easy way..

Did you do any work on it? or is this the stock spec?
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Re: uprated viscous cupplings

Postby gtfour77 » Fri Dec 17, 2010 1:07 pm

tubasteve wrote:
gtfour77 wrote:If you guys look at the diagram, the front wheels(front diff) are working first...then the power gets transmitted to the center diff (open)...once that strats to slip it gets transmitted to the Viscous Coupling, and only then... which in turn drives the rear wheels. You'd have to stop the front wheels to see if the VC is working and unless you have an LSD you'd have to apply even pressure to the rear wheels too... it's best to take it out and measure the torque required to spin it. The one I have out of the car is probably in the 120-150ft/lbs ...very stiff. (with nice clear fluid inside) I have two god units if anyone needs one by the way. From what I have read it's fairly easy to take it out if you only remove the transfer case right cover. From looking at mine, they are really, really well made and last a very long time IMHO, doubt yours is bad but you never know until you test it ;)


not calling you out, just saying how i saws it :P if im wrong dont beat me too hard.

'when there is a difference in speed from the front(main driven wheel[unless wrong]) it causes the vc to heat up the fluid inside causing the power to be added more and more to the rear until 'locked' or they start to have equal speed thus cooling the fluid inside and losening the tight on the rear.'

"if you guys look at the diagram"

did i miss this? :shock: if so help me.

-tubasteve


Nevermind, you are right...I have not looked at the diagram for a while(I must be getting old, it's only been two months since I did all the research!) and thought the front diff "worked" first. It's actually the center diff that is driven directly by the output shaft splitting the output force between the frond diff and the rear transfer..... I need to leave and go live in my simple one-diff trans MR2 world...heh Either way, I am still a believer of diff and coupling testing off the car.
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Re: uprated viscous cupplings

Postby gtfour77 » Fri Dec 17, 2010 1:09 pm

sleeper wrote:
gtfour77 wrote:If you guys look at the diagram, the front wheels(front diff) are working first...then the power gets transmitted to the center diff (open)...once that strats to slip it gets transmitted to the Viscous Coupling, and only then... which in turn drives the rear wheels. You'd have to stop the front wheels to see if the VC is working and unless you have an LSD you'd have to apply even pressure to the rear wheels too... it's best to take it out and measure the torque required to spin it. The one I have out of the car is probably in the 120-150ft/lbs ...very stiff. (with nice clear fluid inside) I have two god units if anyone needs one by the way. From what I have read it's fairly easy to take it out if you only remove the transfer case right cover. From looking at mine, they are really, really well made and last a very long time IMHO, doubt yours is bad but you never know until you test it ;)



You should make a guide on how to take this item out in a fast\easy way..

Did you do any work on it? or is this the stock spec?


I have a spare transfer case but I am really not going to have the time to do a write up... This is all stock spec. I think mario did it on the car, might want to PM him possibly.
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Re: uprated viscous cupplings

Postby MWP » Fri Dec 24, 2010 12:39 am

Something to research perhaps?

http://www.torsen.com/products/T-3.htm
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Re: uprated viscous cupplings

Postby sleeper » Fri Jan 28, 2011 9:52 pm

Anyone tryed to weld the center diff on these?
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Re: uprated viscous cupplings

Postby sleeper » Wed Feb 02, 2011 8:17 pm

Or do you have a picture of how they have done it? Where they machined it and where they put the filler hole?
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Re: uprated viscous cupplings

Postby lalojamesliz » Fri Apr 08, 2011 1:08 pm

^? I just saw this thread and now I'm interested myself :) I have a st205 trans sitting in my garage just waiting to be installed and I would like to make a drain and fill hole to replace the fluid. Did anyone confirm what fluid is inside?
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Re: uprated viscous cupplings

Postby sleeper » Fri Apr 08, 2011 3:42 pm

lalojamesliz wrote:^? I just saw this thread and now I'm interested myself :) I have a st205 trans sitting in my garage just waiting to be installed and I would like to make a drain and fill hole to replace the fluid. Did anyone confirm what fluid is inside?



Have opend a diff to lock it, and i really think that you won`T be ablt to change the fluid by doing that... it is waaaay to thick to get it out or inn... so only option is to open it and change the fluid, then weld it back togetter.. )
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Re: uprated viscous cupplings

Postby lalojamesliz » Sat Apr 09, 2011 4:49 pm

Damn, well did anyone figure out what fluid was the actual fluid used ? Thanks for.the reply
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Re: uprated viscous cupplings

Postby TRDTurko » Fri May 20, 2011 8:41 pm

I may be interested in getting mine upgraded in the near future. I agree there should be a write up on how to remove and test it.
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Re: uprated viscous cupplings

Postby temperacerguy » Thu Nov 03, 2011 2:18 am

st185-sainz wrote:hi,

I found a company that can uprate our viscous centre differentials. I did one example for my car and it feels great. The car seems to have much more traction and does not have so much understeer anymore!
The company already made some visco units for a lot of rally cars, also the TTE gr. N cars.

I paid 590EUR to get mine uprated. It was a special price...

Is there any interest from your side?

cheers
mario



What ever happened to this? Did anyone else actually get it done?

I am interested in having my VC improved, and this sounds interesting.... but $800 seems a little stiff... was that with R&R of the coupler from the car, or is that just the price of cutting it apart, pouring in the new fluid and welding it back together?
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Re: uprated viscous cupplings

Postby st185-sainz » Thu Nov 03, 2011 5:18 am

meanwhile the exchange rate changed and it got worse for you!

if you calculate the shipping costs and really think over the effort of cutting this part and welding it together again - so that it works better than before - you will see that it is not that much money.

but what I found out is, that a hand full of people have got genuine tte parts (x-trac) and the rest is searching a front lsd although their front rear distribution is shit. nobody really bought anything that was discussed!

drivetrain components are expensive! my rear lsd was around 1000EUR, the VC was a prototype and was also more expensive - so the price is valid for finding at least 3 people.

I have enough VC at home and can let them made for a deposit and can ship them to you! so you can exchange it on one evening...
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