Quote:
Originally Posted by Julian2485
Thanks I'm def going to look into getting a upgraded front bar. I Wanted to get a m3 one but heard it doesn't fit on xi. Somehow brentuning was able to make it fit on his pre lci e90 335xi and he had a e93 one on at that. Are you going to upgrade the front diff as well ?
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I'm not aware of any other bar besides UUC that fits an XI, and I don't see how you could make a e93 bar fit, or any other non-XI but maybe it is possible. I'm not aware of any front diff upgrade or a need for one frankly. The issue with the rear is just you like to have a real mechanical LSD instead of the e-diff thing, esp given increased power levels. I don't think people put LSD's in front diffs as steering would be interfered with.
It would be nice to have a transfer case upgrade if one existed, more for function than strength (like a true center diff for example that you could turn on/off or set at a %). All in all the AWD components on XI seems pretty robust if pretty simple. You read about a few TC and front diff failures but it doesn't seem correlated with higher power levels. IIRC the guy who ran 11.3 1/4 mile in his XI at 600+ AWHP broke his front driveshaft and axles on a 1.5 sec 60 ft time for example, but not the TC or diff. People break rear axles all the time too.
AT is weak above 500-550 WTQ if you have one, and people have been desperately looking for a fix for that for years. TCU is heavily encrypted though. But that is an issue with RWD too.