Will a ix diff work in my 325e?

[koe30]

Hey i have a 3.91 viscous lsd and my stock eta lsd is done for. Will this differential swap into my 85 325e without any problems?
i read somewhere that it might not work but joe from autobahn sport told me i would be fine.

[GOOBER]

it'll work fine, just a different ratio. Probably a 4.10

[Alkasquawlik]

Manual or auto iX?

[M-technik-3]

Viscous is a fluid lock up style vs a clutch pack like your clutch you have. I will work, Would you want such a low ratio?

Possible not. Why not get an E28 525i 3.25:1 lsd which wakes up e and eS very nicely.

[nando]

it'll fit but a 3.91 is pretty short for an eta.

[koe30]

its only temporary because the one I have is not turning over very smooth. I am also about a month away from putting in a m20i engine into the car so hopefully I can get by with a such a low ratio on the eta engine until that happens and then ill find a clutch type lsd that works better for me
thanks for the help

[NC325iC]

going from a 2.93 to a 3.91 is a big jump

[Teaguer]

The ratio is not really theproblem .
The issue is it being a viscous LSD ....not really what you want in our cars if you plan on using the LSD.

[nando]

The ratio is not really theproblem .
The issue is it being a viscous LSD ....not really what you want in our cars if you plan on using the LSD.

this argument again? ;)

[NC325iC]

with my limited knowledge of the workings of LSDs i kinda agree with Teag on this.

for an asphalt only car you want your LSD to be default locked giving you equal traction on each wheel until a certain amount of torque differential and allows a difference in speed. like a clutch type.

but with the viscous you get what is basically an open diff (though there is some locking by the VC) untill you lose traction on one wheel at which point the VC thickens and sends equal power to each side.

Im fairly sure i got the VC side right but clutch style i havent read up as much about so please correct me where i am wrong.

[nando]

with my limited knowledge of the workings of LSDs i kinda agree with Teag on this.

for an asphalt only car you want your LSD to be default locked giving you equal traction on each wheel until a certain amount of torque differential and allows a difference in speed. like a clutch type.

but with the viscous you get what is basically an open diff (though there is some locking by the VC) untill you lose traction on one wheel at which point the VC thickens and sends equal power to each side.

Im fairly sure i got the VC side right but clutch style i havent read up as much about so please correct me where i am wrong.

the problem is the stock lockup on the E30 clutch diff is only 25% (and likely less if it's got a lot of miles on it). It's not like it's a race diff with a 50% or more lockup. the VC can lock up to 90%, it might lag a little bit before hitting full lockup but it's not any more of an open diff than a clutch pack LSD is.

It doesn't really have to lose traction before locking either, at least not that you could perceive. You won't be doing a 1 tire fire and then suddenly get both wheels locked for example.