rxhoon 13 Report post Posted August 17, 2014 Hi Can anyone tell me with roughly the power handling capability's of the factory e46 diffs. I have a 318 and know I will need to up grade but possibly would like to run a medium case if possible. looking to have 400 rwhp. Thanks Quote Share this post Link to post Share on other sites
felixfielding 2 Report post Posted August 17, 2014 same. But how are you going to get 400rwhp out of a 1.8? Quote Share this post Link to post Share on other sites
BM WORLD 1258 Report post Posted August 18, 2014 yea easy just a pod filter and bean can muffler will do that Quote Share this post Link to post Share on other sites
my_e36 43 Report post Posted August 18, 2014 Quote: "You know what? This will decimate all, after, you put about fifteen grand in it or more. If we have to, overnight parts from Japan." Quote Share this post Link to post Share on other sites
MD13 459 Report post Posted August 18, 2014 Nice quote - 2jz would fit too! Quote Share this post Link to post Share on other sites
sonic_attack 89 Report post Posted August 18, 2014 Metric Mechanics have a bunch of good reading re BMW diffs. It's all in how much torque your diff is receiving and a combination of the R&P gearing inside that'll effect the longevity. Without delving too deep, I imagine there was a genuine reason BMW jumped up the diff sizing in the cars released with larger and more powerful engines... For what it's worth though, the 188mm diff seems a pretty good option for any BMW owner in a regular real world scenario. They're plentiful, every type of R&P gearing available without searching too hard, they're strong and reliable. Makes me wonder why I chased a bunch of stuff around for a large case anyway. Quote Share this post Link to post Share on other sites
rxhoon 13 Report post Posted August 24, 2014 I was going to be fitting a xr6 turbo engine which was far to tall for engine bay so I have sold the engine and now going to be going rotary so could be 400+hp from a 1.3ltr turbo or 2ltr N/A Quote Share this post Link to post Share on other sites
e30ftw 396 Report post Posted August 24, 2014 1 Quote Share this post Link to post Share on other sites
aw-krazy 45 Report post Posted August 24, 2014 ^^^^^^^^^^^^^^^^^^^^^^^ Quote Share this post Link to post Share on other sites
aw-krazy 45 Report post Posted August 24, 2014 please dont put a "dumpy" exhaust on an e46 Quote Share this post Link to post Share on other sites
allan 295 Report post Posted August 25, 2014 (edited) Not sure what the max torque loading is of the small or medium case diff for an e46. Although It is possible to swap a medium case for a small case with out having to mod the sub -frame as I have not long done it on my e46 Ti. Edited August 25, 2014 by tim 325 Quote Share this post Link to post Share on other sites
rxhoon 13 Report post Posted August 25, 2014 I may just put two ''Dumpy's" on it now. Thanks Tim There seems to be a few good ratio medium case diffs available. Its only a rotary so torque wont be huge. Car will predominately be a track car . Quote Share this post Link to post Share on other sites
