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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Apr-16-2017, 05:04:53 PM   #21
bigjae1976
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Default Re: 4 clutch machineless unsprung LSD

Quote:
Originally Posted by tikamak View Post
Yes a little preload is nice to have a smooth locking pattern.

Concerning the e46 m3 long output flanges, os giken tells you to use 2 long e46 m output flanges ?? Ive never thought about it, is the e46 m3 out flange the long one the same as euro 3.2 m3 ?

U could do what i did and machine the carrier cap and fit a 3rd clutch pack. It comes down to your precise calculation. I could help with that.

Though the stock preload is like 120 ft.lbs which is insanely high but some people like this. Drifters for example
OS Giken has instructions to shorten the long shafts from an E46 M3 or to use the Euro M3 shafts. Also heard a rumor that you can use the shafts from a 210mm E32/E34 diff as well?

3rd clutch pack? Meaning 6 total? So basically you replace the Bellville washers used for preload and tighten everything up with an extra clutch disc and dog ear plate?

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Originally Posted by tikamak View Post
Assembling a custom diff is not difficult if you can source the proper clutch and steel plate thickness.

Luckily you could just buy the complete set from thayer without worrying about calculations. I assume they use 2.0 mm clutches and 2.1 steel plates or maybe 2.0mm steel plates. Which lets you fit 4 clutch packs without springs and zero preload.
I think he is talking about the process of changing the R&P. If I could find someone to do it for $200 locally...hell yeah! But I doubt that since as soon as you say B-M-W...the price doubles 'round here in Wichita.
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Old Sun, Apr-16-2017, 05:30:06 PM   #22
tikamak
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Default Re: 4 clutch machineless unsprung LSD

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Originally Posted by bigjae1976 View Post
OS Giken has instructions to shorten the long shafts from an E46 M3 or to use the Euro M3 shafts. Also heard a rumor that you can use the shafts from a 210mm E32/E34 diff as well?

3rd clutch pack? Meaning 6 total? So basically you replace the Bellville washers used for preload and tighten everything up with an extra clutch disc and dog ear plate?



I think he is talking about the process of changing the R&P. If I could find someone to do it for $200 locally...hell yeah! But I doubt that since as soon as you say B-M-W...the price doubles 'round here in Wichita.


No what i did was have 3 clutch and 3 steel plates with both belleville springs installed to retain OEM preload.

Its a very common setup @diffsonline, they also machine the ramps to make it 1.5 way as well 30/60 or even 1 way 30/90.

You could also send your ramps to diffsonline to machine whatever ramps u like for 400$

I am contemplating a 4 clutch without machining and with no springs feom thayer and 35/60 ramps from diffs online..

That diff wiuld be so awesome. Still look for reviews though
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Old Sun, Apr-16-2017, 06:05:25 PM   #23
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Default Re: 4 clutch machineless unsprung LSD

I'd look on an M5 forum or even Bimmerforums.

Most of what I see here are gear swaps and turnkey conversions from places like Diffsonline.


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Old Mon, Apr-17-2017, 01:05:35 PM   #24
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Default Re: 4 clutch machineless unsprung LSD

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Originally Posted by bigjae1976 View Post
I'd look on an M5 forum or even Bimmerforums.

Most of what I see here are gear swaps and turnkey conversions from places like Diffsonline.


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I posted but it seems people do not understand the question and those who have this 4 clutch kit do not seem very active on forums to come here and chime in.
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Old Mon, Apr-17-2017, 03:28:06 PM   #25
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Default Re: 4 clutch machineless unsprung LSD

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Originally Posted by tikamak View Post
I posted but it seems people do not understand the question and those who have this 4 clutch kit do not seem very active on forums to come here and chime in.
I have done the Thayer 4-clutch kit in an old 750i 210mm diff. So far it's night and day difference over the stock m-variable
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Old Mon, Apr-17-2017, 05:39:08 PM   #26
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Default Re: 4 clutch machineless unsprung LSD

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I have done the Thayer 4-clutch kit in an old 750i 210mm diff. So far it's night and day difference over the stock m-variable


Street, track, or both?


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Old Mon, Apr-17-2017, 06:24:47 PM   #27
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Default Re: 4 clutch machineless unsprung LSD

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Street, track, or both?


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only experience I can speak to for the clutches is track. Most notably, no skipping rear end around corners as it locks and unlocks lol
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Old Mon, Apr-17-2017, 06:39:11 PM   #28
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Default Re: 4 clutch machineless unsprung LSD

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only experience I can speak to for the clutches is track. Most notably, no skipping rear end around corners as it locks and unlocks lol
Did you ever drive it on the street ? is your car a full race car?
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Old Mon, Apr-17-2017, 07:04:04 PM   #29
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Default Re: 4 clutch machineless unsprung LSD

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Did you ever drive it on the street ? is your car a full race car?
It's a dedicated track car now. I did drive it around the block when we first did it though! Doubt that helps. Lol. Did all new bearings and 3.45 gear at the same time
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Old Mon, Apr-17-2017, 08:16:30 PM   #30
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Default Re: 4 clutch machineless unsprung LSD

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Originally Posted by Abad46 View Post
It's a dedicated track car now. I did drive it around the block when we first did it though! Doubt that helps. Lol. Did all new bearings and 3.45 gear at the same time

Why a 3.45? Did you swap in a 5 speed?


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Discussing 4 clutch machineless unsprung LSD in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)