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uprated viscous cupplings

Tue Jan 05, 2010 6:34 pm


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?

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Re: uprated viscous cupplings

Tue Jan 05, 2010 6:36 pm

Are they providing a new coupler or just changing out the fluid in the coupler?

Re: uprated viscous cupplings

Tue Jan 05, 2010 6:51 pm

changing the fluid - but that's the only thing that can be worn in such a cuppling...

everybody who has ever thought of changing the fluid should have seen that our visco is welded and has no screw to change the fluid. the unit needs to be machined and welded! they will make a screw then to make another revision easier...

Re: uprated viscous cupplings

Tue Jan 05, 2010 9:09 pm

stupid question here, but i'm guessing our centre diff is in the transfer case so the motor has to be out and the transfer case accessible in order to have this done correct? If that's the case, my window of opportunity is about to end since my motor is about to go back in any day now.

Re: uprated viscous cupplings

Wed Jan 06, 2010 6:24 am

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...)

Re: uprated viscous cupplings

Wed Jan 06, 2010 7:56 pm

interesting. I will have to look into that, but at a later date. I just need to focus on getting the car back together and on the road then i can actually look at it and understand where the vc centre diff is etc etc.

let us know how the uprated diff works for you as you spend more time with it.

Re: uprated viscous cupplings

Fri Jan 08, 2010 7:26 pm

Sounds interesting. I would suspect more people would be interested if they could do it on an exchange basis for a pre-modified VC.

Re: uprated viscous cupplings

Fri Sep 03, 2010 8:34 am

I`m interested in this, but since i live in nnorway, it would be extremly expencive to shipp it to austalia..

So do you have the name on the company or a guide on how to do it yourself?
What type of fluid did they use?

Re: uprated viscous cupplings

Fri Sep 03, 2010 8:48 am

Hey mate, it's austria, not australia!!! ;-)

Please contact me directly at mario.koenig@gmx.at

I may have also two to be rebuilt and then it would be cheaper for everybody...


Re: uprated viscous cupplings

Fri Sep 03, 2010 10:16 am

Im interested... what new fluid was used?

Does the original fluid degrade, so slip more, or is this new fluid just heavier = less slip?

Re: uprated viscous cupplings

Fri Sep 03, 2010 10:26 am

They open the unit, change the fluid and test it! They set it to the specific torque you like. Depends if you would like to use the handbrake or not!
The old fluid gets worn out and allows more slip.

Re: uprated viscous cupplings

Wed Sep 08, 2010 5:33 pm

I am looking into this right now...anyone in the US that could do this upgrade? If not i am going to tackle this over winter.... Front diff is also on the list. If either of these don't work out I am building an SSM MR2... Another note, talked to one of Quaife reps and seems like thay might be able to help us with the front at least, they even offered to send me a sample diff from an MR2 turbo to test fit and design a transfer shaft for it. I'll keep everyone updated. If nothing else we need ~20 people to do a group buy and they'll design a front diff for us.... any interest?

Re: uprated viscous cupplings

Wed Sep 08, 2010 5:37 pm

Keep us posted on the front diff. We tried to hold a group buy years ago for a front dif, but could not generate enough interest. I am interested to see what you come up with as far as fitment goes with the mr2 lsd.

Re: uprated viscous cupplings

Wed Sep 08, 2010 5:43 pm

Like I said, I am going for it this winter, otherwise I am scrapping the project after next year. With an upgraded VC and front diff I think the car will be very competitive. My rear diff is also worn out so that didn't help but I was literally not going anywhere at the pro finale... :doh: I'll keep you guys posted, I'll just open up a new thread once I get started... around middle of October is when everything is coming apart.

Re: uprated viscous cupplings

Wed Sep 08, 2010 6:43 pm

what rear lsd are you using?! the stock torsen one?! the plate type aftermarket one can be rebuilt easily and you can also change the characteristics of it to fit your driving style!
at the moment I'm out of stock with the plate type ones but I will get some later this year...

the front diff is the last one should care about! I did the centre and the rear diff and the driveability improved a lot! at first I did the rear unit, that prevented from massive understeer. then I did the viscous unit and it gave much more traction and you really feel the car wants to move forward!
just a thought...
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