08-14-2018, 03:10 PM | #24 |
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I haven't limited the boost yet but I was running with the same mods, JB4 map 5 and the same mix of 93 octane/e85 since 2017 with no issues until after I lowered it. Not to say a boost limit wouldn't resolve the issue when it's lowered but if it is boost I know that at the normal height the boost wasn't the issue so lowering it may have made it less robust and unable to handle that same boost level.
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08-14-2018, 05:00 PM | #25 |
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Okay yea I see what you're saying. I'm just surprised it is just you we've heard about so far with all the other people running around with lowered xdrives! keep us posted!
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08-29-2018, 01:52 PM | #26 |
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After reviewing one of my failed front right axles with our Mechanical Engineering guru we believe the issue that caused this is the length of the axle being too short to support my set up. The end of the axle shaft (labeled A in the attachment) has 3 bearings on the end and it rides inside the part labeled B which allows axle A to slide in an out as needed. As You lower the car the hub height on the wheel stays constant with the differential getting lower so the length between the hub and the differential gets longer. With my setup I lowered my car far enough that the end of axle A moved close enough to the end of the part B that one of the bearings was torn apart and the axle came out of part B with no noticeable damage to part B. To lower my Xdrive I would need a longer axle shaft A.
I plan to put my old axle back in the car temporarily so I can see where the bearings fall in part B (since there is no boot left on the old broken shaft) then I will know how much room I have for movement. In addition I can measure the lengths so I can calculate where the bearings fell when the car was another inch lower. I will also know how much longer the shaft would need to be to lower it as much as I want.
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08-31-2018, 10:28 AM | #28 | |
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Basically we believe the failure was not that a bearing was bad but that the bearing rode out too far but until I can measure it on the rack I won't know for sure. I'll report back
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09-20-2018, 12:13 PM | #29 |
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Update: no issues since I raised my car 1 inch. Looking at the angle of the axle at ride height and the mode of failure I'm positive that the issue with lowering the car that much made the distance from the differential to the wheel hub long enough that the axle bearings reached the edge of the receiver they fit into. The fix to allow me to lower my xDrive more would be to have an axle made with a longer shaft between the outer CV joint and the receiver coming off of the differential axle.
I still plan to re-install my broke axle with no boot so I can measure exactly how far the bearing are into the receiver at current ride height. I'm paranoid that I'm right at the edge of failure all the time lol.
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09-26-2018, 12:44 PM | #32 |
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no issues, wot/mashing the throttle/driving like a madman..so far so good!
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09-26-2018, 12:48 PM | #33 | |
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By the way the failure occurred, the axle A (in the above diagram) was completely out of the receiver B with basically no damage to the receiver. The only conclusion I could come to was that at that lowered height I would need the axle A to be longer.
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09-26-2018, 01:13 PM | #34 | ||
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01-21-2019, 01:14 PM | #35 |
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Axle blew yet again. driving slow, about 15 mph immediately after turning a corner, just crazy. I am having a custom length axle shaft made and will be moving to that.
Has anybody else out there lowered their F30 xDrives? I can't be the only one to have done it.
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01-22-2019, 09:12 AM | #36 | ||
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Quote:
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01-22-2019, 09:16 AM | #37 | |
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It seems the MSRP on the axle is about $1363. You should just start saving up for the G80 M3 AWD instead of replacing front output shafts all the time. You'll get better performance with a factory warranty. |
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01-22-2019, 10:23 AM | #38 |
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No, I'm a Process Engineer.
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01-22-2019, 10:30 AM | #39 |
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Third time, car-part.com, got one this time for $113 shipped from a 2015, cheapest yet. I found a guy to make me a custom axle that is longer than the current one. I have one that is mostly disassembled, I have to finish disassembly and ship it to him. He'll make me one to my spec for about $500 so I'll have a custom axle when I'm done for about $700-750 total, then I should be set. I want this car a certain way and I will not give up!! I'm going to be picking up a RWD 135 later this year to build though.
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01-22-2019, 11:43 AM | #40 |
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Wait, what the heck is going on? I've read many posts about lowered xdrives with no problem. I'm lowered, albeit on ACS which is less than other companies but something has to be unique about your setup I would think? Aren't you also still on stock turbo?
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01-22-2019, 12:45 PM | #41 |
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I still am on stock turbo. I know, I knew there have to be other lowered xDrives. I don't know why I keep having this issue. I'm going to put it up on the lift on the weekend and see if I can find anything but I couldn't find anything last time. The axle is completely separated at the inside ball joint with the axle tripod hanging down and the rest of the axle assembly still in the differential as normal. This is bugging the shit out of me and I really need to figure it out before installing my turbo.
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01-22-2019, 05:37 PM | #42 |
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I hope you can find something definitive. I think there has to be a constant that you'll find that would keep leading to a broken axle downstream. There just has to be something we are missing! Good luck to you, keep us informed please!
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01-23-2019, 09:00 AM | #43 |
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Thank you, I will. I agree with you, it may be a combination of factors which will make it harder to diagnose but I will keep on it.
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