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BMW 3-Series (E90 E92) Forum
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Question for those with LSD’s...
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06-13-2018, 03:58 PM | #1 |
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Question for those with LSD’s...
Installed Helical LSD a few days ago. Since then I’ve had my rear passenger brake get blazing hot and start dragging twice.
Both times while driving on interstate right after driving somewhat aggressively on some backroads playing around with LSD . Like the passenger rear brake was dragging really bad I could feel the car was working harder to maintain speed in a high gear and see feel heat waves coming off the passenger rear brake when I pulled over. Sounds like a stuck caliper, but seems like a big coincidence that a caliper would stick twice in 4 days right after LSD install. (First Time was same day right after install on the LSD test drive.) Are there any software conflicts with the E LSD and the mechanical LSD that might be going on? LSD maker says no and never heard of this happening from LSD before. I checked all the brake lines and could find nothing apparently wrong. Was thinking maybe I pinched a line during the install, but can’t see that anywhere. After the car cooled 30 minutes both times this happened everything seemed normal again no dragging brake no heat. So I ordered a new caliper and will install this weekend but just wanted to see if anyone had seen this before? |
06-13-2018, 06:18 PM | #2 | |
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06-13-2018, 06:30 PM | #3 | |
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But you’ve got me thinking... between those 2 times the brake cooked I had also done some very aggressive driving (different day) and also had full traction on to see if it intervened (wanted to see what the new intervention threshold was) and had no issues even though I did get the traction control to activate a few times. And I’m thinking if it was software wouldn’t both brakes potentially get cooked, not just the same one all the time? |
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06-13-2018, 07:59 PM | #4 | |
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With a LSD both tires are spinning at the same time (depending on the ratios and style) so the computer will more than likely get very confused if the car is losing traction, yet both rear tires are spinning at the same speed.
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06-13-2018, 09:23 PM | #5 |
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Sounds like a lot of outlandish theory.
It's more likely you have a sticky caliper and it's just a coincidence. Ediff doesn't fight a mechanical lsd... They both do the same thing. Statability control doesn't get confused. It's a program. It can still brake wheels to keep you within a tolerable yaw rate regardless of wether or not the wheels are experiencing slip... Two different things. Last edited by bbnks2; 06-13-2018 at 09:29 PM.. |
06-14-2018, 03:48 AM | #6 | |
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06-14-2018, 01:43 PM | #7 | |
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If you install a LSD (depending on the ratio) the tires will spin at different rates than the OEM open diff. This will most definitely confuse the system in *certain* situations. There is a chance it could be a seized caliper, but I just wanted to clarify as I have seen this issue with LSD installations on E9Xs before.
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