BMW M Performance LSD for M235i, 335i, 435i Arrives. Pricing and technical FAQ inside |
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05-08-2014, 12:41 PM | #23 | |
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Your car won't have to roast the inside brakes to make up for its ridiculous open diff. You won't have to worry one-tire-fires. You'll be able to get some legitimate sustained oversteer too. Quaife doesn't make clutch-type LSDs though, do they?
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05-08-2014, 12:42 PM | #24 | |
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05-08-2014, 01:09 PM | #25 |
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Way too expensive IMO. I have custom 4.10 3 clutch pack Diff with asymmetrical ramping for around 3 grand if I remember correctly
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05-08-2014, 01:16 PM | #27 | ||
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05-08-2014, 01:22 PM | #28 | |
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05-08-2014, 01:39 PM | #30 |
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Correct. However they have higher lock percentage (%65 IIRC) compared to this option. OS Giken's clutch type is $3,500-ish and locks up to %100. But one could argue that a clutch type LSD is overkill for a street car.
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05-08-2014, 01:40 PM | #31 |
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So what's the differance between this and the one on the F80/82 and F10? I see lockup is only 30% and on the M models its up to 100%. Is that the only differance with this differantial? (no pun intended )
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05-08-2014, 01:48 PM | #32 | |
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IIRC current M cars dont even use clutches anymore. There is a variable servo operated mechanism that can go from full open to full closed or anywhere inbetween in .001 sec. |
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05-08-2014, 02:00 PM | #35 | |
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05-08-2014, 02:37 PM | #36 |
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I remember that old euro e36 M3 wear 25% lock and same 25% was optional lock to first e36 models until -95. They work fine, rubber burn well. (both of them)
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05-08-2014, 02:58 PM | #37 |
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Can someone please explain the meaning of these locking % being thrown around? Whats the difference between 30% and 100% from behind there wheel in non technical speak?
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05-08-2014, 03:24 PM | #39 |
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100% lock is like having a welded axle. 30% lock means the diff can send 30% of its power to the wheel with grip.
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05-08-2014, 04:32 PM | #40 | |
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05-08-2014, 04:51 PM | #41 | |
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When you have a "25% LSD", the maximum difference in power received by the rear wheels is 25%. With a 25% diff, one side can receive up to 62.5% of the total torque while the other gets 37.5%. Higher % can be beneficial in certain situations like accelerating hard out of a corner, but higher % also increases understeer in slow corners and increases oversteer in the rain (sounds counter-intuitive but basically you are making it harder for the two rear wheels to spin at different speeds in a corner). For a street car, I would say 20-40% is ideal. Older BMWs with LSDs like the E36 M3 had 25% lockup so this new one is actually more aggressive. The fact that it only locks 9% on deceleration means that it actually won't cause understeer on corner entry and the 30% acceleration lock is not enough to make it dangerous in slippery conditions. The current M cars use an electronically-variable lock which allows them to vary lockup as needed. These diffs are incredible but they are much more difficult to retrofit onto a car since they need to tap into wheel speed sensors and probably the car's computer systems to function so obviously BMW didn't want to offer such a complex unit as an upgrade for the standard cars. I personally think the price and ease of installation are perfect for this LSD when you consider that it won't be noisy like some aftermarket diffs, doesn't require service as often as some aftermarket diffs (I don't believe it's truly lifetime, I'd probably replace the oil every 50-100,000 miles), and comes with a warranty. I avoided using the term "lockup" because some people describe LSDs the opposite way where 100% lockup means there is NO difference in the speed of the two rear wheels or the power applied to each. This is, as someone above said, like having a welded diff and is what drifters use but it would be terrible to drive around with a fully locked diff all the time, the car would be very difficult to turn. Last edited by Remonster; 05-08-2014 at 05:06 PM.. |
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05-08-2014, 05:03 PM | #42 |
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Doesnt the M235i have the same drive train as the F20 M135i?
I noticed the M135i wasnt listed. Do you think this will go into the f20 hatch? Ive been holding off my order until this was available - I will be upset if it doesnt work on the F20 M135i |
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05-08-2014, 05:24 PM | #43 | ||
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I'm assuming that in your example, 62.5% goes to the wheel with more grip, correct? |
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05-08-2014, 05:41 PM | #44 | |
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In Europe, the LSD is already listed as a performance option for M135i on BMW website. So, to answer your question: Yes, it works and is available for M135i. |
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