318ti with S54 diff axle problems

[Steve K-B]

Hi people,

Im looking for an upgrade to my axles and possibly rear arms etc. I'm currently running an S54 in my 318ti making 280 rwhp (what torque I have.... I'm not sure). there is more power to come out of out of it and I'm also looking at a supercharger system for the future so want a set up that can handle up to 400 rwhp.

I have two question areas, if you have any of the answers I would love to hear from you.

1: I currently have a medium case 6 bolt 3.91 diff and E30 325i axles (same as E30 M3). What power/torque can these handle before they give problems? Is the 8 bolt 210mm diff an over kill? Has any one put one of these in a ti? What diff did the E36 Z3M use?



2: Since my engine upgrade from 180 to 280 rwhp I have not surprisingly broken the stub shaft off the outer CV. I see there are lots of options of using custom axles like here:
https://www.pureperformancemotorspor...ft-axle-s.html

The only problem i see is the area where it broke wont have changed.

I know little of the Z3M upgrade, Does this give you you a larger axle? I believe the off set in the arm is larger. I use a 20mm spacer on the rear so this shouldn't be a problem other than it being very expensive option.



The car is only raced on tarmac roads and I can be pretty rough on my drive line. I'm looking for something strong and reliable.

Thank you in advance

Steve