Quote:
Originally Posted by Skip MacLean
I'm in too; but grumpy right now, as my X5 6MT just ate its engine. Ever heard of a bend piston ring and broken crown? 10 psi compression on #1... Absolutely no idea how. Wife and son were driving along on I5 to Bay Area, minding their own business when the engine suddenly lost power and started running rough. Trouble codes indicated misfire #1, #3. I got a pair of coils and set of plugs and set off in pursuit. Replaced those, no better. Compression test indicated above result and boroscope revealed tip of piston ring sticking above piston crown. Looks like engine replacement is in the near future. :-(.
Regarding 6MT. I like the car and the character but the gear spacing is not great, especially on 1st and 2nd gears; 1st is too low and 2nd is probably also a little low for good normal driving. Also, shifter on all BMW MT's is sloppier and less precise than I think it should for BMW's pedigree and their excellence in other driving characteristics.
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Wow! That is an odd failure! What is the mileage of your X? I would consider a salvage motor and later do a light rebuild if there is no damage to the cylinder head or walls on your current m54 engine.
As far as the gearing goes, I'm swapping in a pair 2000-2003 4.4i differentials into my 6MT. They are a direct swap and would help reduce the gearing across the board. You 5 speed guys should definitely do this, especially if your not towing big loads. You can sell your old differentials and its a free mod minus the time swapping them out.
Thanks to Sedc, who swapped in some 3.64 ratio differentials from the 4.4i, went an additional step and made his front an LSD diff, reported that he got an additional couple of MPG's and gearing that is easier to live with.
Here's a link to the thread if your interested. Its on the top of my list of mods to come.
http://www.xoutpost.com/bmw-sav-foru...ted-slips.html
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2005 X5 3.0, 6MT, Alpine White on Truffle Brown, Sport, Preim, and Cold Weather, Alpina Stainless Headers, AFe Intake, UUC SSK, OEM 87's, 3.64 Differential Swap,Performance Modified Euro 2 Tune, UUC LTW Flywheel and HD clutch, Bilstein B12 Suspension kit 
Future mods ZHP/Schrick Cam Shaft upgrade, Operation code name: Doppelschrauben-Kompressor
Wife's Ride: 2011 e70 X5 351 M///Sport.
Also in the fold: 2004 X3 3.0, 6MT, Black Sapphire on Terracotta, port, Premium, Cold Weather.
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