01-13-2013, 12:02 PM | #1 |
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QUAIFE LSD for F20/F21
Hi, anyone with a 125i or M135i who have or have been thinking about fitting a QUAIFE LSD?
Sounds like a good deal - £1465 mounted on the car in UK. If I understand right the M135i is about £200 more. If nobody have this for the F20 - anyone with other experience with QUAIFE LSD and other BMW's? |
01-13-2013, 12:45 PM | #2 | |
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01-13-2013, 01:23 PM | #3 | |
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The Quaife unit is not as suited for drifting as clutch pack differentials, but very efficient for going early on the throttle out of corners. It also works well together with the traction control. The LSD sometimes needs a little bit of help from the traction control to start working in very slippery conditions. |
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03-24-2013, 04:29 AM | #7 |
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Probably none--not while it's still under lease anyway. But I know from personal experience how much an LSD contributes to the purity of the driving experience. And few people would deny that the elimination of an LSD on the spec sheet was done at the behest of BMW's marketing department.
But I would want to be convinced that the diff could be swapped over without doing any damage and otherwise not losing any functionality in the electronic control system. That's why I want Wayne to go first, haha. Last edited by mdt; 03-24-2013 at 04:51 AM.. |
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03-24-2013, 09:11 AM | #8 |
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Been there done that in the old 135i. No impact on the electronics at all. Makes a HUGE difference to how the car drives. Much more predictable tail end and you can drift at will.
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03-24-2013, 09:26 AM | #9 | |
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When buying our 116i, I was convinced that I would upgrade it with a Quaife unit. My previous 3 BMWs all got LSDs built in. After testing the F20 on dry tracks, wet tracks and snow/ice-tracks, I have pretty much come to the conclusion that I don't need the LSD. The stock system works surprisingly well. I am sure the M135i deserves a Quaife, though. |
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03-25-2013, 12:46 AM | #10 | |
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03-25-2013, 01:40 AM | #11 |
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03-25-2013, 03:39 AM | #12 |
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I don't know for sure, but I would have thought its the other way around? Ie. it comes on when you turn DSC off? It makes much more sense. But I can tell you from a driver's perspective, I was able to slide my Drexler equipped 135i with ease, where it wasn't so simple previously. I suspect it would be the same with my new car M135i.
Last edited by WAY; 03-25-2013 at 03:45 AM.. |
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03-25-2013, 04:06 AM | #13 | |
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Thinking about how it logically should work does not make much sense here. If it did, the modern BMWs would not select comfort mode when you disable DSC. Our 116i can drift quite easily with DSC off in slippery conditions. Lack of power makes it difficult on dry tarmac. If the diff was open with no e-diff, it would have been more unpredictable. You can feel the e-diff working on corner exits on dry tarmac as well in the 116i. When I don't have enough power to spin the outer rear tire at full throttle after apex, you would expect the car to understeer. After all, it has a weight shift to the rear tires. The e-diff brakes the inside rear tire, creating torque vectoring that tries to turn the car into the corner. This kills the understeer, and allows me to go very early on the throttle. |
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03-25-2013, 05:52 AM | #14 |
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No, I agree with Way. It makes no sense to disable the e-diff with DSC off. I think the selection of comfort mode is to reduce throttle response, and reduce the propensity of the car to be destabilized by driver who doesn't know what he is doing.. Car makers want their cars to fail safe.
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03-25-2013, 06:32 AM | #15 | |
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And why would drivers who don't know what they are doing want to disable the DSC? |
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03-25-2013, 06:55 AM | #16 |
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I've just looked it up. The old 135i's e-diff only works with DSC turned off completely. I could swing the tail out on the 135i before I put the Drexler on, but it wasn't as consistent and you cook the rear brakes. And on the track, there is no comparison. Mechanical diff was far superior in feel.
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03-25-2013, 07:23 AM | #17 |
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03-25-2013, 10:21 AM | #20 |
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Has anyone drifted in their cars yet ? I haven't finished running in my car yet so I have not done so.
But according to this video the E-lsd seems ok:
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03-26-2013, 04:07 AM | #22 | |
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Most drivers without track driving and drifting experience would probably not be able to tell that the LSD is missing. |
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