Generally used CV joints in FSAE competitions

[ketan]

Hi,

We are a first year team and have already designed our splined shafts,hubs,uprights etc on paper.But i wish to know what CV joints are other teams using? specifications would be greatly appreciated .
And also i would like to know if torsen itself provides the shaft along with "University special torsen differential".

Please help us out...

[ketan]

Hi,

We are a first year team and have already designed our splined shafts,hubs,uprights etc on paper.But i wish to know what CV joints are other teams using? specifications would be greatly appreciated .
And also i would like to know if torsen itself provides the shaft along with "University special torsen differential".

Please help us out...

[Parker]

We were in this same spot last year and ended up using the heaviest axles and joints ever. A bunch of teams will use the Taylor Race cv joints, they are pretty nice, but still a little expensive for our budget. Other teams design and manufacture their own cv joints. We are planning on using modified ATV axles this year.

http://www.taylor-race.com/

Parker

[Chris Allbee]

If you want light there is no real way to do it cheaply. You'll either have to shell out a lot of cash or invest a bunch of time, or maybe both. And no, torsen does not supply the shaft. Our team uses the talyor race tri-pod joint, machines our own housing and purchases their axles as well. We have to make our own stub shafts which isn't cheap because of the splining. The whole system is rather expensive, but we don't have problems with breaking axles either.

[Nihal]

We are using VW rabbit Axles and CV joints with Fiat X1/9 Bearings. You can machine down the stock joints a good amount and they are plenty cheap. They probabaly aren't as light as the Taylor race setup, but it is really cheap and can be done quickly.

[Scotty]

Well we just finished up with the new Torsen stubs. These will incorporate the housing which is built into the stub and has an extra 5 " of spline so you can cut to fit. It weighs 2 pounds and runs $196.00.Here is a link.Or you can go to our New Products section on the web site.
http://www.taylor-race.com/pdf/ACF76B0.jpg

http://www.taylor-race.com/pdf/02004181newprod.jpg

Plus we are now offering our diff as a bare package.As pictured it is 7 pounds.
http://www.taylor-race.com/pdf/ACF76B0.jpg

[kwancho]

That thar is a tiny diff. Very small gear-type, I assume?

[Scotty]

Here are some basic dimensions of our diff.

http://www.taylor-race.com/pdf/ACF76BE.jpg

http://www.taylor-race.com/pdf/ACF76BC.jpg

Give me a shout at scotty@taylor-race.com
if you have any questions.

[rjwoods77]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Scotty:
Here are some basic dimensions of our diff.

http://www.taylor-race.com/pdf/ACF76BE.jpg

http://www.taylor-race.com/pdf/ACF76BC.jpg

Give me a shout at scotty@taylor-race.com
if you have any questions. </div></BLOCKQUOTE>


Is there any info on TBR for that thing. Quaife says their ATB is designed for each application sspecifically and that they cannot/wont provide TBR numbers and/or help with modifying them to be what you desire. Do you guys have any information on that issue that you would be willing to share/help with.

[Scotty]

Rob

A torque biasing diff will have a Maximum as well as a minimum bias.
It will bias in linear fashion between 50/50 and 80/20 depending on the traction available.
It will act as an open diff splitting the power 50/50 as long as the grip is adequate ,but as soon as one wheel begins to lose traction the diff will bias torque to that wheel that has the greater traction
An important note to remember is if in a curve ,if the inside wheel carries less than 20% ,You will have wheel spin.So it is important to design for minimum dynamic weight transfer to avoid wheel spin.
Note: Salisbury and Cam and Pawl diffs will also exhibit this same behavior . e.g. When too much weight transfer occurs, wheel spin will result.
If you are designing a diff from scratch you can vary the maximum bias by varying helix angle or pressure angle. Quaife has perfected the helix and pressure angle through years of testing and experience.I hope this will help.

[Dave Cook]

Another option for teams using the Torsen diff is to get a bar with the output splines on each end and make your own CV Joints to fit GKN or Taylor tripods.

See http://www.paradigmmotorsports.com/html/torsen_splines.html

I have 5 of the large diameter bars ($225)and 2 of the smaller ones ($129)left and I'm not planning on cutting another batch this year. Each bar has a pair of splines that does 2 CV joints or stub axles.

If you get a Torsen diff you will find that they use a very unique cutter angle which requires a custom cutter. This is why I ended up making these when no one else was doing it.