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11-30-2018, 06:31 PM | #23 | |
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Matticus91 Bird's and Quaife are like the O.G. LSD retrofitters for the E9x/E8x. Chris Harris did a review on a Hartge E92 335i with a Quaife LSD.
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11-30-2018, 07:16 PM | #24 | |
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Edit: Oh. And the hook-up is amazing and controllable. Edit: No 4-clutch for the 135i in manual.
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Last edited by Suprgnat; 11-30-2018 at 07:48 PM.. |
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12-01-2018, 09:16 AM | #25 | |
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MFactory 3.08 Diff in Large casing was $2500 with core I believe. Maybe a bit more, came with paid return shipping label for the stock diff. Bimmerworld aluminium RSFB $280 YCW Reinforced axles $1000 I also did M3 lower camber links, sourced those from a pick and pull for $80 each YCW custom valved M3 rear dampers $300ea HPA custom M3 rear headlight bracket $60 Plus shipping for the random bits, and hardware. Hardware was around $100 total Make sure you have a diff lockdown of some sort too. Tons available. BMS has a new one that is cheap and looks solid as hell. I have one made by a forum member, been on for probably 2 years and doing fine. True solid RSFBs have to be pressed in to the subframe, so factor some shop install costs. I had it all done as I'm now working 80hr+ weeks and have zero time to work on my car anymore. Added a solid chunk to the cost of the job. I don't say this to be a woe is me thing, just don't forget about install costs when tallying for a big job like this.
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Last edited by ShocknAwe; 12-01-2018 at 09:29 AM.. |
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12-01-2018, 10:42 AM | #26 | |
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12-01-2018, 10:54 AM | #27 |
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Dunno what to expand on. I paid for shipping from synchrotech and they sent a return label for my core. The shop has a pickup by shipping companies and handled boxing up the core and calling a pickup for me.
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12-01-2018, 11:14 AM | #28 | |
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They have a German dealer and installer, they confirmed that the diff for my 125i is a simple replacement (not welded like the 135i), comes with a lifetime manufacturing warranty (i know but just saying what i was informed). Got quoted €1,800 including the install, fluid, diff etc. Will be a great time to replace those soft diff carrier bushings/diff mount bushings with 1M/M3 ones for even more stability, if i plan things correctly i should be booking in my car for that diff before Christmas myself. If you search the E9x forums regarding "Birds" or "Quaife", someone did a detailed review on his car (335i with 420-ish hp) and reported how quiet is it on the road and did 2-3 days on Nürburgring laps without any issues. |
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12-01-2018, 04:06 PM | #29 | |
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A friend over here bought his LSD(a Quaife) thru them... cost him around 1,300 pounds(but this was several years ago) in the end with shipping to Germany. Afterwards he shipped his core back to them. He really likes his LSD. I just thought I point them out to you. Dack
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12-01-2018, 06:14 PM | #30 |
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Another vote for diffsonline here. Dan was very responsive and helpful with my questions.
I went with a Wavetrac with a change in ratio to 3.73. I'm very satisfied with the street manners and the performance on the track. I believe it was somewhere in the neighborhood of $2400 for the full pumpkin. Good luck with the shopping! |
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12-02-2018, 09:16 AM | #31 | |
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12-03-2018, 12:06 AM | #32 |
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I got a MFactory 3.46 last Black Friday from Syncrotech. Did the install myself and reused everything except seals, there was no chance of saving them.
I didn't check anything. I just put things back where they came from. 20K+ later, no issues I know of. BUT, I think I should have done measurements. I have a Torsen in my Focus and it acts completely different; you absolutely know it's there. The 135, not so much. Vs the e-diff I don't feel it was night/day difference. Yes it'll help. But I don't see anyone who's really dug into 'tuning' the e-diff and chassis control. SOP is code out and get mechanical because I don't understand or like computers. Which works, but is an incomplete story. |
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12-03-2018, 07:04 AM | #33 | |
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I did a little bit of messing around in the DSC module; ended up changing a bunch of brake and 'nanny' things that everyone who goes in there ends up coding-out, but I also decided to explore inputting 1M values in for the oversteer coefficients. It made DTC mode less like a useless gimmick mode, and more like a proper goldilocks step between the nanny state that is default, and sideways at the slightest breath of throttle. It's perfect for driving in the rain, as it doesn't interfere too quickly. You can get sideways and crank-out some serious wheel spin (128i spinning in second is hysterical) but it'll step in relatively gently when you get too far out of whack, which is reassuring. The real difference made by the 'proper' diff being installed, happened after removing all of the nannies so that the darned thing could do its job. Now it's just a wonderful balance; grip when you need it, slip when you don't want it.
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12-03-2018, 07:41 AM | #34 | |
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Everyone codes out the eLSD after installing a mechanical LSD because that is what you should do. With a proper mechanical LSD you don't want any braking intervention from the ABS system as the mechanical LSD has that covered. There have been pretty decent advancements in eLSD software technology since the E82 was launched, but unless you are a software engineer at BMW, there is no hope for getting updated algorithms into the DSC module. Also keep in mind that the factory eLSD is setup with factory parts in mind. The minute you change tires to something other than factory spec, the system variables have changed and it will not behave the way engineering set it up. The eLSD is great for BMW as it gives them a "free" differential on a non M-car. And for the vast majority of appliance driving consumers it is good enough as it prevents some wheel spin for starting from a stop on slippery surfaces. Where it fails is the predictability, since the system doesn't intervene until it senses slip. Trying to drift in the snow with the factory open eLSD vs. a proper mechanical LSD is worlds different. |
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12-03-2018, 09:38 AM | #35 |
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Great post, this was my favorite part. Time to go shopping lol
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12-03-2018, 09:46 AM | #36 |
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Drifting is a great way of marketing I can't wait to drive the car in some actual snow this winter.
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12-06-2018, 09:14 PM | #38 | |
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Definitely helps to have a second to operate the jack while you guide the diff out and prop it up. I did it on jackstands over the course of an evening and a morning, but I was slow, and the driveshaft needed to soak in PB Blast to loosen off the diff. |
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12-07-2018, 03:16 PM | #39 | |
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12-07-2018, 05:25 PM | #40 |
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I got the M Factory helical for my 135i. It is an improvement but definitely not a night and day improvement. It will make hooning around a lot more enjoyable but as far as actual grip and performance, the stock e-diff worked just as well. I don't notice much of a difference with the LSD. Maybe I need to drive a stock diff 135i and my car back to back to really notice it
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12-07-2018, 07:00 PM | #41 | |
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12-07-2018, 09:40 PM | #42 | |
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I think you'd feel the biggest difference with a locking LSD. The action of locking and unlocking, and then how much it actually locks completely changes how the car behaves. It's a very predictable, simple, and delightful experience when you're pushing it on the track. On the street, however, it's either (A) a noisy, clunky, chattery thing that makes pulling out of parking lots in an overly-calm fashion a tire squealing affair, (B) a psychotic device that tries to kill you if you even think about touching the throttle in a corner that's wet on tires that aren't meant to be in the wet, or (C) your bestest friend that ensures that you will depart that Chick-fil-a drive, in front of that impending Prius with absolute predictability, and a possible hint of sideways exuberance. Matticus91 My answer to your thread: If you want a stock-like feel, a quiet nature, and the ability to do relatively fun things with ease, go for a helical. I'd personally go with a Wavetrac, as it alleviates some concerns of having absolutely no locking effect when one wheel has no traction. I imagine this is what you will go for... If you want a very different driving experience, a race car-ish experience, and the ability to very fun things, very easily, and very controllably, go for a clutch-type. I'm partial to my MFactory 1.5-way, I love the way it feels out-of-the-box, and it came with things to adjust it if I want to (which I might eventually). I can't wait for some proper amounts of snow to test the traction of this diff vs the eDiff, I have fairly high expectations (for entertainment purposes, of course).
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12-08-2018, 10:40 AM | #43 | |
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12-08-2018, 01:43 PM | #44 |
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As an argument to my lack of understanding/tuning of the ediff,
The recent drift world record by the 2018 M5, I've been looking and looking as to the technical changes they made to accomplish this feat. Bupkis. But I don't feel it's that out of line in thinking that they made changes to the control modes to make the car accomplish this. It's so computer controlled that it should be self evident IMO. Thinking that, I don't see that a straight mechanical diff is the end all/be all for the ultimate handling machine or the best driftorz car. There needs to be a balance of both the mechanical and the electronic. I know full well that the amount of TQ I try to put down is too much for the tires and the diff out of corners. If I WOT the car will not step out, it's just gone right now. It can't react fast enough. The ediff will kick in before the mechanical though. But when I turn power down, the mechanical hits before the ediff. So there is a correlation error I need to work on adjusting. I just haven't had the conditions to play enough yet. |
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