|
|
11-06-2014, 02:31 PM | #1 |
Captain
120
Rep 937
Posts |
Salisbury Limited Slip Conversion
Thoughts?
http://dinancars.com/product/d773-00...ip-conversion/ (my concern is not with a gear ratio change) Is it significant? Are heavy track cars running similar modifications? Any one know of any other aftermarket companies offering similar upgrade?
__________________
2009 E93 M3 Sold
|
11-06-2014, 03:17 PM | #2 | |
Brigadier General
2721
Rep 3,335
Posts |
Quote:
__________________
Current Stable:
2024 G20 M340i Melbourne Red/Cognac 2019 F87 M2 Competition 6MT, LBB, slicktop, exec pkg 2007 E91 328i Silver, slushbox, Eibach fr/E93 M3 rear sway bars, ARC-8 |
|
Appreciate
0
|
11-07-2014, 09:17 PM | #4 | |
Captain
120
Rep 937
Posts |
Quote:
(For the critics street/track is not the same as track/street which is more aggressive than the first) Thoughts on my story above?
__________________
2009 E93 M3 Sold
|
|
Appreciate
0
|
11-07-2014, 10:00 PM | #5 | |
Banned
101
Rep 701
Posts |
Quote:
You have to determine the right mix of gearing, agressiveness of lock-up when it comes to street/track. But that is really the driver decision as many people have different tolerance for NVH. Clucth LSDs are known to chatter and pop and they vary in how progressive they lock-up. All part of the action of the clutches. I like the OS cause you can set the LSD to 1 way, 1.5 or 2.0, (2.0 would be straight track). You can also customize the angles and ramp up rates between the clutches changes how progressive the lock up rate, but that needs to be done by a speciality shop (Dan -diffsonline, are great shop here in North East) Have a look at this link too, its a good read. http://www.osgiken.net/products.php?product=lsd Last edited by m3ray; 11-07-2014 at 10:25 PM.. |
|
Appreciate
0
|
11-08-2014, 09:24 AM | #6 |
Second Lieutenant
468
Rep 280
Posts
Drives: M2 F87, M3 E92 & E46, C63, 911
Join Date: May 2012
Location: Europe
iTrader: (0)
Garage List 2018 BMW M2 F87 [0.00]
2008 BMW M3 E92 [0.00] 2003 BMW M3 E46 [0.00] 2012 BMW M3 E92 [0.00] 2011 Merc C63 AMG [9.00] |
yes, a clutch type lsd is a must have for a track car!
i tried all units available on the market in my e92. here are my thoughts: http://www.m3post.com/forums/showthread.php?t=788992 the osg was the worst performing of all units i tried. the dinan setup is too weak for track use and the price tag is crazy. best unit would be a oe gt4 unit or a heavily modified zf unit (dinan uses a non-modified one). i have all units in stock... but i am located in germany :-( |
Appreciate
0
|
11-08-2014, 09:34 AM | #7 |
Second Lieutenant
468
Rep 280
Posts
Drives: M2 F87, M3 E92 & E46, C63, 911
Join Date: May 2012
Location: Europe
iTrader: (0)
Garage List 2018 BMW M2 F87 [0.00]
2008 BMW M3 E92 [0.00] 2003 BMW M3 E46 [0.00] 2012 BMW M3 E92 [0.00] 2011 Merc C63 AMG [9.00] |
here are some pics of the disassembled units on the market
http://www.m3racing.de/sperre.html |
Appreciate
0
|
11-08-2014, 08:34 PM | #8 | |
Captain
120
Rep 937
Posts |
Quote:
Thanks. You did what I wish I could do. And like you said my concern is obviously the osg and other website brand order form type lsd's are really tricky to setup with the amount of parameters you can change and the few setup-informations that are shared. Seems like the OE GT4 is the best all around setup. My next concern would be getting more feedback from trackers that use it.
__________________
2009 E93 M3 Sold
|
|
Appreciate
0
|
11-10-2014, 11:23 AM | #9 |
Captain
141
Rep 979
Posts |
This is the same conclusion I came to as well, Drexler diff. The only problem is, I cannot find a place in the USA that sells them. Maybe I am not looking hard enough?
|
Appreciate
0
|
11-12-2014, 09:34 AM | #10 | ||
Captain
120
Rep 937
Posts |
Quote:
Quote:
Driflo Any thoughts on vendors for the GTS Dif in the states?
__________________
2009 E93 M3 Sold
|
||
Appreciate
0
|
11-12-2014, 09:43 AM | #11 |
Captain
162
Rep 658
Posts |
Salisbury units are really nice and much better than stock. The Dinan unit looks pretty good and OS Giken is a masterpiece and extremely flexible. Turner uses them in their racecars.
However, i've never liked to install OS Gikens with their "off the shelf" settings. Check out my article to see how OSG's work and how to set them up: http://www.motoiq.com/MagazineArticl...ferential.aspx Billy |
Appreciate
0
|
11-12-2014, 02:17 PM | #12 |
Second Lieutenant
468
Rep 280
Posts
Drives: M2 F87, M3 E92 & E46, C63, 911
Join Date: May 2012
Location: Europe
iTrader: (0)
Garage List 2018 BMW M2 F87 [0.00]
2008 BMW M3 E92 [0.00] 2003 BMW M3 E46 [0.00] 2012 BMW M3 E92 [0.00] 2011 Merc C63 AMG [9.00] |
the GTS diff is the same crap as the one in the standard m3! you would need a GT4 (racecar) unit, only there the drexler is installed!
i do not know any sources in the states. i currently have a drexler gt4 unit in a i=3.85 pumpkin installed laying around here. and i have a drexler with a 4.10 gearset and a naked drexler unit not assembled at all yet. and i have a lot of my custom units which are quite similar to the drexler concerning setup and materials used (same clutches) but way cheaper. i.e. the 45% 2-way setup with double the amount of clutches than the one on the dinan picture would cost eur 1.300,- plus shipping. the 65% version with three times the amount of clutches costs eur 1.600,- the drexler oe unit costs eur 2.000,- i do not know if importing them would make any sense. shipping a lsd unit should be possible at a reasonable price. but shipping a whole pumpkin would be very expensive. so you still need to have someone in the US who installs it for you. |
Appreciate
0
|
11-12-2014, 02:39 PM | #13 | |||
Second Lieutenant
468
Rep 280
Posts
Drives: M2 F87, M3 E92 & E46, C63, 911
Join Date: May 2012
Location: Europe
iTrader: (0)
Garage List 2018 BMW M2 F87 [0.00]
2008 BMW M3 E92 [0.00] 2003 BMW M3 E46 [0.00] 2012 BMW M3 E92 [0.00] 2011 Merc C63 AMG [9.00] |
looking good doesn't necessarily mean locking good!
Quote:
did turner also try the gt4 unit or do they use it because they sell it? i bought, dis- and assembled, installed and tested all lsd units available worldwide for the e92 m3 myself (except cusco, this one is still missing) and i even tried different setups of various units. so my ratings are based on experience and comparison. and my rating for the osg against the competition is... well... not so good. Quote:
the stock m3 e92 setup of the osg superlock is a joke. it doesn't lock at all. [and i can hardly believe that your setup locks effectively in the nsx when i look at the ramps, active clutchpacks and neg. preload setup you did... but ok, it is another car and another lsd unit.] the next setup i tried after talking to the osg guys was locking way to hard. after the second try i lost my patience and gave the next manufacturer a try as i am not the R&D guy of osg. i spent a lot of money for this "premium" lsd and i expect to also buy a setup that performs at least quite ok! Quote:
the osg website and the explanation of their own units is only proof, that they do not know themselves how clutch type lsd units do work. |
|||
Appreciate
0
|
11-12-2014, 07:05 PM | #14 | |
Captain
141
Rep 979
Posts |
Quote:
__________________
Mods: too many the list wont fit in the sig page. PM me
Tesla Referral code: http://ts.la/juliana77782 |
|
Appreciate
0
|
11-12-2014, 09:17 PM | #15 | |
Captain
120
Rep 937
Posts |
Quote:
__________________
2009 E93 M3 Sold
|
|
Appreciate
0
|
11-12-2014, 09:21 PM | #16 | ||
Captain
120
Rep 937
Posts |
Quote:
Quote:
Is your review really only based on drifting? (you say it's not, but you admit your heavy into drifting; wondering if there is a bias) Would that explain why you like the more aggressive lockup setups? I'm in to the track and improving my lap times not drifting. I just want the ideal LSD for tracking so I don't waste my money. My bottom line is that I need a setup that will help apply even power as soon as I give throttle to help track time and avoid wheel spin/sliding and I don't want chatter (from lsd setup) when I late brake to take a turn. Thoughts on my setup?
__________________
2009 E93 M3 Sold
|
||
Appreciate
0
|
11-13-2014, 02:02 AM | #17 | |
Second Lieutenant
468
Rep 280
Posts
Drives: M2 F87, M3 E92 & E46, C63, 911
Join Date: May 2012
Location: Europe
iTrader: (0)
Garage List 2018 BMW M2 F87 [0.00]
2008 BMW M3 E92 [0.00] 2003 BMW M3 E46 [0.00] 2012 BMW M3 E92 [0.00] 2011 Merc C63 AMG [9.00] |
Quote:
the manufacturer is more important if you will just put the new unit in your pumpkin without reconfiguring it. |
|
Appreciate
0
|
11-13-2014, 02:10 AM | #18 | ||
Second Lieutenant
468
Rep 280
Posts
Drives: M2 F87, M3 E92 & E46, C63, 911
Join Date: May 2012
Location: Europe
iTrader: (0)
Garage List 2018 BMW M2 F87 [0.00]
2008 BMW M3 E92 [0.00] 2003 BMW M3 E46 [0.00] 2012 BMW M3 E92 [0.00] 2011 Merc C63 AMG [9.00] |
Quote:
of course i also test my diffs in real world conditions on the street and on racetracks, especially nürburgring nordschleife, where i take part in clubracing - not drifting ;-) Quote:
|
||
Appreciate
0
|
11-13-2014, 09:44 AM | #19 | ||||
Captain
162
Rep 658
Posts |
Quote:
Quote:
Quote:
I am surprised and question your claims that the OS Giken "Super Lock" LSD did not lock with the factory settings. That is what OSG is known for and prides themselves that their diffs lock 100%. In every off the shelf OSG setup that I have driven, the LSD locks too aggressively and too soon. I have always recommended deactivating plates and delaying and softening the lock as described in my article for a better performing and smoother engagement for both track and especially street use. With doing the above adjustments to make the OSG less aggressive, I have never had inside wheel spin despite driving cars with over 800whp including NA and Turbo: NSXs, 350Zs, 370Zs, M3s, EVOs, RX7s, RX8s, Miatas, Mazdaspeed 3s, S2000s, Boxters, STIs, etc... Quote:
0.02 |
||||
Appreciate
0
|
11-13-2014, 12:14 PM | #20 | |||
Second Lieutenant
468
Rep 280
Posts
Drives: M2 F87, M3 E92 & E46, C63, 911
Join Date: May 2012
Location: Europe
iTrader: (0)
Garage List 2018 BMW M2 F87 [0.00]
2008 BMW M3 E92 [0.00] 2003 BMW M3 E46 [0.00] 2012 BMW M3 E92 [0.00] 2011 Merc C63 AMG [9.00] |
here is what i wrote about it in the other thread:
"... build quality, materials used and the surface finishing is really thumbs up. but once installed i was pretty much disappointed on the locking capabilities: it hardly locked at all... it simply felt like an open unit. after discussing with the supplier and manufacturer we were pretty sure that the neg. preload setup was to high. i got some new pressure plates and a different setup suggestion. i am really curious an how it will perform in the new spec which i will assemble these days as i am pretty convinced of the general design and the negative preload idea in theory. i guess i will only need to find a proper setup (which should normally be done by the manufacturer but well...)" ... "a few days ago i put my new os giken setup in my m3 with the 60/60 instead of the 35/25 ramps and 7 instead of 5 active clutchpacks. and i also reduced the negtive preload from 336 to 224Nm. before: after: here are some more pictures of my new setup: http://www.m3racing.de/umbau.html#8 now it locks way to hard. i tracked the car yesterday and it was really nasty to drive. well, at least it is the proof that the unit works at all (after the weak locking performance of the spec-s). i am really wondering what setups other guys are driving in their track cars??? as os giken is said to be quite popular in the states, can anybody out there tell me what setup they use in an M3 racecar (or other FR cars)?" ... [and i just saw we discussed on this in the other thread... this is what i wrote to you:] "the off the shelf one had only 5 out of 7 clutchpacks activated on each side: furthermore it had 336kg neg. preload. it didnt lock at all... no noise, no problems in normal driving... but massive single wheelspin when driven hard. then i changed pressure plates to more shallow ramps, reduced neg. preload to 224kg and activated all clutchpacks what lead to an massive lockup even in normal driving. next up i'll change the pressure plates back to the spec-s version and leave all clutchpacks engaged and the neg. preload at 224kg." if i have some leisure time i will give the osg a third (and last) try. so what setup would you suggest me? Quote:
Quote:
so the osg comes as a spool?! or what do you or do they mean with "100%"? every single clutch type lsd will provide full lock and have both wheels spin in the same speed. do you know of any unit that does not do this? the percentage says at what torque difference left vs. right it opens and the wheels begin to rotate at different speeds. so a 100% unit will never open. you would call this a spool! but for a spool the osg seems a little expensive and extremely over-engineered! doesn't it? and i think you would admit the the osg opens up at a certain torque difference. so the correct locking value is somewhere between 0 and 100 but not 0 and not 100... as any other clutch lsd! the osg website says something different. but well, it is simple physics. or do you have another conclusion or explanation for it? Quote:
it was exactly meant as this! ;-) |
|||
Appreciate
0
|
11-13-2014, 03:12 PM | #21 |
Captain
162
Rep 658
Posts |
100% lock would mean 100% lock (under acceleration load) like a spool or a detroit locker under heavy acceleration loads since as more load is applied, the clutch plates are squeezed by the ramps. But with the negative preload, this 100% lock is delayed.
Did you see one tire rubber marks from your inside tire when coming out of a corner? Do you have logged data with individual wheel speeds to see the inside wheel spin issue? I'm still very surprised to hear you had on throttle wheel spin issues with the OS Giken since that has not been he experience i've had with them. Without hearing your feedback, I would have thought the off the shelf settings with the negative springs and 5/7 plates activated would be right in the ballpark of where you would want it. I de activated another plate for my NSX which is going to have 500whp and our 800whp racecar has 5/7 engaged like your BMW unit... 60/60 is too aggressive, especially for the decel side ramp angle. I'd honestly put it back to stock. What tires/sizes and power are you running? |
Appreciate
0
|
11-16-2014, 02:08 PM | #22 | ||
Second Lieutenant
468
Rep 280
Posts
Drives: M2 F87, M3 E92 & E46, C63, 911
Join Date: May 2012
Location: Europe
iTrader: (0)
Garage List 2018 BMW M2 F87 [0.00]
2008 BMW M3 E92 [0.00] 2003 BMW M3 E46 [0.00] 2012 BMW M3 E92 [0.00] 2011 Merc C63 AMG [9.00] |
Quote:
commonly, static friction is not described with a percentage as it simply makes no sense! a certain percentage should define the moment when the lsd transfers from static to dynamic friction. this happens due to a certain torque difference left vs. right wheel. if the difference exceeds the %-value of the lsd-setup the clutches break loose. so an open diff has 0% and opens up immediately. a welded or spool hast indeed 100% as it will never open. any clutch type lsd will be somewhere between 0 and 100 depending on the application it is meant for. would you agree on that? i agree on that. if this works in real world conditions, it could be a good thing for circuit racing but the downside is it will be harder to predict. as i did not get the unit to work properly so far i cannot judge over this feature. but it is at least an interesting idea which indeed separates this unit from the competition. Quote:
i will leave the neg. preload at 224kg (or even less?) and leave all clutchpacks active but switch back to the spec-s ramps. would you agree that this is a setup that could possibly work? concerning data logging i would want to have a possibility to have the speeds of the two drivewheels logged or even reported while driving in an acoustic way. quiet while locked, beeping while differentiating. but so far i was only able to read the speeds via inpa software. the wheel speeds are being sent over the canbus. any idea on how to implement a practical solution to extract the data easily and in a useful way? so i have no datalogging-files of the osg setups but i have loads of experience with lsd units and driving on the limit. so i myself know for sure that the spec-s setup hardly locked at all and the spec-x stayed locked way too long. my measurements on the driving centre one drivewheel on tarmac, the other on slippery surface proofed this. as i do not get paid but have to pay myself for this testing work, i do not have any official proof of authenticity of course... i only test until i myself am convinced ;-) |
||
Appreciate
0
|
Post Reply |
Bookmarks |
|
|