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      04-01-2018, 09:18 AM   #265
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Quote:
Originally Posted by driftflo View Post
Quote:
Originally Posted by roastbeef View Post
Might be a silly question, but does gear/bearing polishing have any impact in noise at all? Not clunking, but diff whine.
whine normally comes from worn out bearings.
if fresh bearings or the gearset itself make significant noises this is due to incorrect installation. and if this is the case, the solution is not polishing but setting it properly!
i would not expect too much from any surface treatment in a bmw 210 rear axle.
but if you have the budget and are searching for the last tenth of a second in performance, why not!
but for noise reduction only i definitely would not suggest to spend that money.
In my case, i had some nasty whine from incorrect pinion bearing preload.

If you put your diff back in the car and it is whining, LOUD, it was probably set up improperly. Granted, i have solid everything with no rear, but still i knew something was off. Pulled it back out and got it redone, and it sounded like it was supposed to.

I did not get any treatment, as Florian and i discussed it does not really do much in regards to a part time track car. If it was a full blown race car, in which i was doing enduro and long stints i may have done a polish.
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      04-04-2018, 01:20 AM   #266
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i'm kinda curious if the bearing/gear polishing could extend the life of the clutches... less heat generally means a longer service intervals.
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      04-04-2018, 03:51 AM   #267
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the clutches wear due to dynamic friction. heat is not that important for them.
i am pretty sure that it has no relevant influence on clutch wear!
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      07-25-2018, 05:06 PM   #268
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as promised here are a few pics and infos on the m2 and m4 diff conversions that i recently did:

here you see the OE pumpkin with the active m-diff:


on the left an untouched pumpkin and on the right three already removed active lsd cores:


next up the welded ringgear needs to be separated from the lsd core:


surface need to be shaved perfectly even:


then holes are drilled and threads cut:


now it is time to build the drexler lsd core... here with my special "GT race" setup that is also available for m3 e92 of course... drilled clutches, weight optimized pressure rings, ... nice stuff in there!


installed in the pumpkin and with properly set dynamic friction and backlash it looks like this:



if you want to see some more pics just click here:
http://www.limitedslip.de/service/ei...rexler_m4.html
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      07-26-2018, 09:50 AM   #269
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this thread is awesome. i did a lot of rear diff research for my evo, went with a cusco 1.5 type RS, which I think functions relatively similar to OSG. I think all the salisbury clutch diffs are similar though
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      07-27-2018, 10:27 PM   #270
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Impressive work driftflo

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      07-28-2018, 01:25 AM   #271
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driftflo what is the theory with the drilled clutch plates? oil evacuates out of there sooner for faster lockup once it starts?

also, are any of these setups significantly less weight than oem? i don't know if they are or not, but i figure any less rotating mass in the driveline is going to help.
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      07-28-2018, 05:29 AM   #272
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the holes improve oilflow between the clutches. so the transition from lock to open and vice versa will happen smoother. the car behaves less aggressive without compromising the (locking) performance.

you can save ~10% of weight compared to the OE LSD. and as this is rotating mass it does add some small amount of performance. not much, but it is a nice side effect you get while improving the lsd performance.

OS giken is even heavier as the OE unit. drexler slightly lighter. the lightest core is the bacci romano one but this one needs special output flanges that do add some weight again. and it is not capable of taking so many clutches as the drexler does. so you could make the drexler a little lighter still if you remove some internals (that would downgrade the performance)... so that does not make sense!

Last edited by driftflo; 07-28-2018 at 05:57 AM..
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      07-28-2018, 05:49 AM   #273
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driftflo, you're the man. i appreciate you sharing this with us. when the time comes for me to upgrade, we'll be talking!
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      07-28-2018, 10:24 PM   #274
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Hi, I was informed that running traction control (MDM mode) while on track is actually harmful if you have an OS Giken LSD. Is that true?
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      07-29-2018, 03:05 AM   #275
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      07-29-2018, 12:37 PM   #276
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I have a DCT car and I believe it's the diff thats making some bad noises and clunks. What would you reccomend for a street car that see's a ton of very hard spirited driving? Is the 3.45 available? Is Wavetrac a good choice for a car like this?
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      07-29-2018, 12:51 PM   #277
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Quote:
Originally Posted by nycplumber View Post
I have a DCT car and I believe it's the diff thats making some bad noises and clunks. What would you reccomend for a street car that see's a ton of very hard spirited driving? Is the 3.45 available? Is Wavetrac a good choice for a car like this?
I put a Quaife LSD and a 3.45 rear end in mine. Yes, I can recommend that combo for a street car that sees a ton of very hard spirited driving. www.diffsonline.com sells a 3:45 for the DCT as well as other ring gear ratios. I have no experience with Wavetrac. No doubt our knowledgeable member = dirftflo does. The Quaife LSD is robust, and does not have clutch packs nor the shear fluid pack that the Viscolok OEM M3 LSD setup has. Just some food for thought for you on your research journey.
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      07-29-2018, 06:32 PM   #278
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The 3.45 has worked fine without any rev match issues? Im assuming you didn't tune the dct. I have heard mixed reviews on the Quaife so I would like some more input.


Quote:
Originally Posted by M3Post View Post
I put a Quaife LSD and a 3.45 rear end in mine. Yes, I can recommend that combo for a street car that sees a ton of very hard spirited driving. www.diffsonline.com sells a 3:45 for the DCT as well as other ring gear ratios. I have no experience with Wavetrac. No doubt our knowledgeable member = dirftflo does. The Quaife LSD is robust, and does not have clutch packs nor the shear fluid pack that the Viscolok OEM M3 LSD setup has. Just some food for thought for you on your research journey.
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      07-30-2018, 02:49 AM   #279
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a torsen like wavetrac or quaife is better than the OE viscolok. if you have no direct comparison to a clutch type drexler, you will be happy. if you have, you will always opt for the clutch type unit.
this is the reason you read mixed experience with torsens. the ones that have no comparison do like it, the others are disappointed.

people often want a torsen because they are advertised as "maintenance-free". but this does not mean they are "wear-free". they do wear and if they are worn out they need to be completely replaced and cannot be rebuilt like a clutch type unit.

if you want to go the torsen route anyway, i'd suggest the wavetrac over the quaife. wavetrac is the best torsen unit out there.
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      07-30-2018, 06:03 AM   #280
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Great to know! I was considering the 3 clutch style as I've read that's good for street and hard driving as well. I'm just hung up one how it will effect the transmission.


Quote:
Originally Posted by driftflo View Post
a torsen like wavetrac or quaife is better than the OE viscolok. if you have no direct comparison to a clutch type drexler, you will be happy. if you have, you will always opt for the clutch type unit.
this is the reason you read mixed experience with torsens. the ones that have no comparison do like it, the others are disappointed.

people often want a torsen because they are advertised as "maintenance-free". but this does not mean they are "wear-free". they do wear and if they are worn out they need to be completely replaced and cannot be rebuilt like a clutch type unit.

if you want to go the torsen route anyway, i'd suggest the wavetrac over the quaife. wavetrac is the best torsen unit out there.
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      08-01-2018, 04:11 AM   #281
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Quote:
Originally Posted by nycplumber View Post
Great to know! I was considering the 3 clutch style as I've read that's good for street and hard driving as well. I'm just hung up one how it will effect the transmission.
i would not recommend any asymetric setup. 3 clutchpacks mean, you have one on one side and two on the other.
i'd at least use 4 clutchpacks PLUS a cupspring. currently i still have two 45% rebuild kits (4 clutchpacks, cupspring, installation instructions) available at my local US distributor. you only need an old 210 zf lsd core as a basis.
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      08-02-2018, 12:00 AM   #282
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Quote:
Originally Posted by driftflo View Post
Quote:
Originally Posted by nycplumber View Post
Great to know! I was considering the 3 clutch style as I've read that's good for street and hard driving as well. I'm just hung up one how it will effect the transmission.
i would not recommend any asymetric setup. 3 clutchpacks mean, you have one on one side and two on the other.
i'd at least use 4 clutchpacks PLUS a cupspring. currently i still have two 45% rebuild kits (4 clutchpacks, cupspring, installation instructions) available at my local US distributor. you only need an old 210 zf lsd core as a basis.
Do I need to machine the end plate for a 4 clutch + cup spring kit?
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      08-02-2018, 09:18 AM   #283
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Quote:
Originally Posted by driftflo View Post
i would not recommend any asymetric setup. 3 clutchpacks mean, you have one on one side and two on the other.
i'd at least use 4 clutchpacks PLUS a cupspring. currently i still have two 45% rebuild kits (4 clutchpacks, cupspring, installation instructions) available at my local US distributor. you only need an old 210 zf lsd core as a basis.
I'm looking to buy a complete unit. Where can I find that 4 clutch set up and is this what you would recommend for a street car that see's a ton of abuse?
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      08-08-2018, 05:08 PM   #284
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Do I need to machine the end plate for a 4 clutch + cup spring kit?
yes! but it is definitely worth the extra effort!
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      08-08-2018, 05:10 PM   #285
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Quote:
Originally Posted by nycplumber View Post
I'm looking to buy a complete unit. Where can I find that 4 clutch set up and is this what you would recommend for a street car that see's a ton of abuse?
pn me and i will give you the contact of my US distributor. i guess he can provide a complete unit with my internals installed.
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      08-09-2018, 02:50 PM   #286
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Quote:
Originally Posted by driftflo View Post
as promised here are a few pics and infos on the m2 and m4 diff conversions that i recently did:

here you see the OE pumpkin with the active m-diff:
I recently sealed up my diff for the first time and even though I laid out a relatively thin bead of gasket maker (Permatex Ultra Black), by the amount of goop that squeezed out on the outside after sealing, I'm sure there's even more on the inside. I assume that even if it breaks off on the inside, it'll be harmless to the gears/LSD?
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Last edited by DavidZ; 08-09-2018 at 03:01 PM..
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