I know GSC broke new ground by bringing the 40/60 center diff to market and I was wondering if you had any thoughts on doing a torque biasing rear to go along with it?

Right now Mitsu does one for the front as does the aftermarket but nobody is doing one for the rear. Sure would be nice to have that outside wheel push the car around the corner once it has all they extra power back there to work with.

 

Is this what you're looking for?
https://www.evolutionm.net/forums/sh...d.php?t=312886

 

I think there is a reason why Cusco, Quaife, KAAZ, Ralliart, etc. does NOT make an ATB type diff for the rear. . .

Trust me, if it were the best way to go, Cyber EVO or HKS CT230 would be using one. . .

You have 2 choices, a clutch style rear diff or swap in an AYC setup from a JDM Evo. That should give you what you're looking for. . . .

 

Well, nobody did a 40/60 diff until these guys did it... Did the Cyber Evo run one of them?

I think there is room for improvement and the fact that AYC does many of the same things as a ATB would seem to indicate that a mechanical solution may not be so far fetched and idea.

 

Not exactly. It looks like a very high quality mod for the money and many folks seem to like what it is giving them. With that said I am just exploring other options as clutch types and ATBs would give you a very different end result.

 

The problem with all of the ATB's I've ever checked out is that when one wheel is unloaded or in the air (a somewhat frequent problem in the evo) the diff does not function properly.

That fact alone would cause me to not consider that type of diff for the rear.

 

Actually, Cusco has had the 35/65 center diff for years. GSC's "40/60" is almost exactly the same, just 50% less expensive.

And yes, the Cyber EVO did use the Cusco 35/65 . . . and still does as far as I know. . .

EVOlutionary

 

Sure, there are issues with this or ANY system. The clutch type diff has its own set of issues that have been beaten to death but why rehash them here?

As for lifting a wheel, I only see that happen regularly to auto crossers who run very heavy springs and or large bars. As I do not run huge bars or auto-x I don't see it as an issue for me and find the potential benefit of using an ATB to be interesting and worth exploring.

This is not at all an attack on those who use clutch systems or sell them. I just want to explore other options as in some conditions the ATB is theoretically superior. Simple as that. If I can not find rear ATB, at some point I may consider a different clutch type rear but as for now, I'm not.

 

we havent thought about doing something like that, for one the cost would be high to do one and i don't see the need for it. a 40/60 and a clutch style rear is just fine.

 

Well, I think I found a company that is interested in giving one try. They are booked up right now but by late spring we should be able to get something cooking.

I would like to get a few done and beat them up a little and see how they do.

 

I'd say lifting the inside rear is a result of large lateral acceleration and balanced lateral load transfer distribution. If you like your cars to understeer or don't acutally experience high lateral accelerations, by all means look into an ATB diff.

FWIW, my stock evo lifts the inside rear about 1 foot off the ground.

 

Your stock evo lifts its wheel a foot huh?

A foot... 12 inches?

You are now my hero.

 

Thats alot!!

which rear sway bar do you have??

 

It's not the rear bar that really controls it . . . it's front end dive. The outside front nosedives, pulling up the inside rear. Hence the term "tripod". . .

 

I have pics of my car at mid ohio with the front end all but plowing a ditch in the turn. Still, no wheel off the ground, let alone a foot off the ground.

I must be teh fail.