petroscf wrote:I would appreciate some opinions here: Current setup is the open 4.10 diff with an eco 5 sp gearbox. I am quite happy with this setup, and I am sure that it will get even better with more power which will be provided by the new engine. However, I have a 3.64 lsd form Nas, and was thinking to give it a try (when the new engine's fitted). What do you think of that?
It all depends on what power and torque you get out of the new engine.
A 3.45 and eco box is standard fit on a 323i with ~140bhp and 140lbft (190Nm)
But they are much livelier with a 3.64 and then more with a 3.91.
I don't know the full specs your new engine will have but lets say you'll have - ~130bhp and 130lbft (180Nm) as per the 2002 tii.
I'd guess the 3.64 would work quite well for fast road use.
If you were racing on track then a 4.1 is the way to go or even a 4.45 (if you can find one!).
To be honest it isn't hard to swap over the diffs so give the 3.64 a go especially as the LSD will make a big difference to how it drives.
If you don't like it and would prefer the shorter ratios, the LSD unit could be rebuild into your original 4.1 diff (I'm sure Hardeman could help there).
Hope this helps
Ben
