Experts chime in: Torsen Diffs in an IGT conversion

[myndseye]

Some of you guys have experience with these in your trucks. Pretty much the concensus is don't do it. But what about the Inferno GT and other 1/8th rally type cars. Before I make the finantial plunge, what do you guys think?

[suicideneil]

They are a bit iffy. For nitro use where low-end torque is... low, they are great. With BL power and instant torque I have heard they dont last too long- better off sticking with the hardend steel HB diffs and what-not.

I would probably try one in the front. It seems to me like thats where you would see the most benefit from it, and the traction load would be less than the rear. Im by no means an expert on this subject though, my only experience with this kind of diff is from full size cars. A lot of performance oriented awd full size cars run limited slip front diffs with open rears (EVO, mazdaspeed6, WRX, etc). Are you running a center diff or the 2 speed?

Take a few min and go read postings over on UE - the diff section, they've been discussed over there for both nitro and elec RCs. Offroad -no good in either, too weak. Onroad - maybe??

[myndseye]

Originally Posted by B15

A lot of performance oriented awd full size cars run limited slip front diffs with open rears (EVO, mazdaspeed6, WRX, etc). Are you running a center diff or the 2 speed?

Is a brushless conversion without the two-speed, and that's pretty much how I see it also. Even though you come off the gas and save the drivetrain from the big hits of jumps, off-roaders frequently come off the ground in the straights, (while under heavy power) and I am quite sure that that spells disaster for the complex internals of a torsen diff. The stresses placed on a diff by an onroad car should be much less, and maybe I can get some of the performance of the cars on the road today using these type diffs. I was thinking of starting with just the center like Audi's legendary handling Quattro's have (http://www.audi.com/audi/com/en2/too...ferential.html), and maybe moving to the front and rear later.

Originally Posted by Duster_360

Take a few min and go read postings over on UE - the diff section, they've been discussed over there for both nitro and elec RCs. Offroad -no good in either, too weak. Onroad - maybe??

I have read in many places, both rc and 1:1 scale. I have especially searched in foreign forums that cover rally game type cars, but nothing seems to be out there. The reason I started this thread was just for some hypothesizing specifically about an onroad application, seeing as that rally game type cars are just getting popular here in the states. One thing I do know is that later if all goes well, I will spring for some Nuova Faor or Fioroni torsens after I run through some trials with the Ofna's, but the sticker shock on them is a bit much to experiment with.

[nl12]

Xray is coming out with a "XRAY Active Diff" it may be stronger

[jhautz]

X ray active difs have been out for a few weeks now.

I just got the Xray active diff for my XB8 conversion. I only have one track day on it so far, but it seems like it will hold up fine. Much more robust design than the torsen I saw a while back.

The local indoor track is a smooth clay and it works good on it. Lets you really lay down the power comming out of the corner. As soon as you punch it the front diff locks up and it pulls like you are running 20K fluid in the front. As soon as you let off the power it releases and allows you to turn like whatever fluid you have in it. I set mine up with 5K and it really allows the buggy to bite in the tight turns on the indoor track.

Havent gotten to try it yet but I hear on bumpy tracks its not so good. When the front wheels start bounciing and the front diff is basically locked up it tends to make the buggy twitchy.

The thing about the Xray active dif is they are designed to be run in front only. Not really sure how they would hold up in the center or rear. And they only work in Xray buggies. They are not the same layout as the standard Kyosho/hyper/HB style difs.