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09-02-2018, 02:43 PM | #287 |
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sorry for the delay, i was on holidays for a few days...
for inquiries please contact me via email: service@limitedslip.de |
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09-02-2018, 02:45 PM | #288 | |
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09-03-2018, 06:17 PM | #289 |
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driftflo / Florian makes excellent diffs for our cars based on the type of use/driving style your car will see.
I recently had Florian build me a custom Drexler LSD and it has transformed the car. With DSC off, the car is infinitely more adjustable with throttle input mid-corner. Wish I would have done this sooner as the car is much more engaging to drive in a spirited manner. |
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09-03-2018, 06:39 PM | #290 | |
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09-03-2018, 06:47 PM | #291 |
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I have a OSG Spec-S about to go in, together with 3.45 FD. Will rebuild the rear diff at the same time with new bearings and seals.
Anything else I should do while I'm back there? Any adjustments I should make to the OSG? |
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09-03-2018, 06:52 PM | #292 |
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09-04-2018, 02:49 AM | #293 |
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09-05-2018, 11:06 AM | #294 |
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Question...
Do I need to mess with backlash and gear mesh patter if I just swap the LSD unit and use the same ring gear?
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09-12-2018, 02:41 AM | #295 |
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yes, you should definitely check backlash and gear mesh pattern!
quite often it is ok, but not every time! a check is done quickly and if it is not ok it is better to know it before you installed it in the car and find it out the hard way. |
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09-18-2018, 02:53 AM | #297 |
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unfortunately not!
potential customers do mostly complain the already high prices for the drexler "light" lsd cores. using even more expensive materials would not make sense for bmw applications i guess. but i have new lightweight pressure rings that save ~0,5kg... so i am still searching for cost effective performance and weight improvements! |
09-18-2018, 02:55 AM | #298 |
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here are the lighter pressure rings used in an M4 LSD
i do also have them in stock for m3 e92 applications. |
09-18-2018, 07:39 PM | #299 |
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later on when i have you build mine, we'll try to do some lightweight stuff for the fun of it.
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09-19-2018, 02:30 PM | #300 |
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How do I determine how much to machine off the top plate? Or can I send you my top plate to do the machining?
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09-19-2018, 03:01 PM | #301 | |
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of course i can do the machining for you if you send the topcap! |
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10-03-2018, 08:59 AM | #303 |
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It's not electronic but totally passive. It's a GKN Visco-lok LSD unit. Requires speed differential between rear wheels to (quickly) begin locking action.
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10-03-2018, 09:03 AM | #304 | |
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https://www.m3post.com/forums/showth...1158445&page=8 It's really really long, but I think it might have something in there for you. But a couple quick answers to your questions: -the E9x M3 diff is not electronically controlled. It's a speed sensing unit and requires one wheel to spin up for it to lock. -traction control does not prevent the rear wheels from spinning at different speed. It still allows that to happen. Otherwise, there's no way for the unit to lock. Most of traction control is done by cutting engine power, and individually engaging the front brakes as needed. I also did a write-up showing traction control behavior. Many people think traction control uses the rear brakes mostly. This is incorrect. The AIM Solo DL can show how all four calipers activate individually. I posted some fairly quick laps from several tracks showing traction control engaging the front brakes almost 100% of the time. You can check that out here: https://www.m3post.com/forums/showpo...&postcount=747 |
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10-03-2018, 09:08 AM | #305 | ||
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10-03-2018, 09:44 AM | #306 | |
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The OEM diff is a "safe" diff. It locks gradually---and only when there is a significant rate of spin difference. A fast locking diff like an OS Giken Superlock can send a car sideways much more easily. This is why they do not put fast locking mechanical diffs on street cars. Some guy with a lead foot on the streets in a corner will send that car sideways right away and traction control will struggle to intervene in time. In more recent cars with electronic diffs, like the F8x M3/4, you can keep the diff open on the street, and then when the car is churning out high performance, the diff can lock more quickly. Pretty cool. Spend some time reading that writeup. |
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10-03-2018, 09:48 AM | #307 | |
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Here's a thread from the coding subforum that shows how traction control is calculated between different models - specifically post #8 (and refer back to post #1) https://www.m3post.com/forums/showth...light=euro+mdm I will summarize shortly here: There is some sort of equation that isn't known to non-BMW engineers, but what we do know is that the car is measuring coefficient of friction in some way and there are values assigned to each chassis as to when to engage traction control. For M3_UEBERSTEUERN_MUE_1_2_M: wert_00: !(E90+(S65B40+US,S65B44+!US+MAN_UMF_GTS),(E92,E93) +S65B40) wert_01: E90 + S65B40 + US wert_02: E92 + S65B40 + !US + !MAN_UMF_GTS wert_03: E92 + S65B40 + US wert_04: E93 + S65B40 + !US wert_05: E93 + S65B40 + US wert_06: E92 + S65B40 + !US + MAN_UMF_GTS wert_07: E90 + S65B44 + !US + MAN_UMF_GTS Here are the coefficient of friction that are associated with each value: wert_00: 2.5 wert_01: 4.09375 wert_02: 2.09375 wert_03: 3.296875 wert_04: 3.09375 wert_05: 4.484375 wert_06: 2.09375 wert_07: 2.09375 It was interesting to me just how much the US E93 got shafted on traction control compared to Euro E92 |
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10-03-2018, 09:55 AM | #308 | |
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