The Differential Thread

Kgolf31 · 12-26-2014, 12:20 PM

TheSt|G

Quote:

Quality posts are a rarity in these parts.

You can change eDiff profiles via coding.

Can you please expand and explain how this can be done? Or any documentation

TheSt|G · 12-26-2014, 12:42 PM

Quote:

Originally Posted by Kgolf31

TheSt|G

Can you please expand and explain how this can be done? Or any documentation

In one of the modules there are a number of profiles for the eDiff, including turning it off or letting it know there is a LSD present. I stumbled across it a year or so ago, so this is just off the top of my head. I'll post more whenever I get around to actually installing my LSD.

Kgolf31 · 12-26-2014, 12:52 PM

Interesting. If I could turn off the E-LSD that would be ideal.

Pyrat 2 · 12-26-2014, 02:40 PM

I haven't experienced any of the open diff effect on my quaife at the track with my 135. I've had about 14 full track days on the diff so far. Maybe in theory it will go open but in practice it doesn't. or at least it hasn't to me. I have a plate type LSD on my 330 and I have noticed lock induced understeer on several occasions. Certain turns on certain tracks and every time I hit the same corner. That's why I switched from plate to quaife when I bought a diff for my one.

3002 tii · 12-26-2014, 03:50 PM

Quote:

Originally Posted by HeelToe

I haven't experienced any of the open diff effect on my quaife at the track with my 135. I've had about 14 full track days on the diff so far. Maybe in theory it will go open but in practice it doesn't. or at least it hasn't to me. I have a plate type LSD on my 330 and I have noticed lock induced understeer on several occasions. Certain turns on certain tracks and every time I hit the same corner. That's why I switched from plate to quaife when I bought a diff for my one.

I echo the same sentiments about how in real world the Quaife works find. I've done 50 track days with my Z and never experienced any open diff like effects.

skyscraper_g80 · 12-26-2014, 05:07 PM

Reason why you probably haven't noticed the open diff effect is because the eDiff would work in conjunction with the LSD, so whenever one wheel completely lifts of the ground and starts spinning, the eDiff will catch it. If I had a 135i with a Quaife, I'd actually keep the eDiff on and not try to code it out.

I have a 130i without eDiff and used to run a Quaife. Definitely noticed open diff effect in certain conditions. Have since changed to an OS Giken Superlock which eliminates the open-diff effect.

_Ryan_ · 12-27-2014, 03:21 AM

Quote:

Originally Posted by evolution42

Reason why you probably haven't noticed the open diff effect is because the eDiff would work in conjunction with the LSD, so whenever one wheel completely lifts of the ground and starts spinning, the eDiff will catch it. If I had a 135i with a Quaife, I'd actually keep the eDiff on and not try to code it out.

I have a 130i without eDiff and used to run a Quaife. Definitely noticed open diff effect in certain conditions. Have since changed to an OS Giken Superlock which eliminates the open-diff effect.

Interested in your rear suspension setup- were springs captive when the vehicle was raised?

Bimmer-Bob · 12-29-2014, 03:40 AM

Quote:

Originally Posted by TheSt|G

Don't forget to get the BMW/Quaife finned diff cover when you do this.

Which diff cover fits our cars? I've only seen them for the 135i.

_Ryan_ · 12-29-2014, 07:04 AM

Quote:

Originally Posted by Bimmer-Bob

Which diff cover fits our cars? I've only seen them for the 135i.

Quaife
VAC

Bimmer-Bob · 12-29-2014, 07:12 AM

Quote:

Originally Posted by _Ryan_

Quaife
VAC

I checked the VAC site & the only 1er diff covers I saw were for the large 135i diffs.

Didn't even know Quaife made diff covers. Anyone familiar with US sellers?

Bimmer-Bob · 12-29-2014, 07:13 AM

Quote:

Originally Posted by 3002 tii

I echo the same sentiments about how in real world the Quaife works find. I've done 50 track days with my Z and never experienced any open diff like effects.

Did you go with stock final drive ratio? I can't remember if I've asked you about this before - I seem to recall discussing a 3.46 or 3.73 final drive with someone.

Suprgnat · 12-29-2014, 08:02 AM

Quote:

Originally Posted by Bimmer-Bob

I checked the VAC site & the only 1er diff covers I saw were for the large 135i diffs.

Didn't even know Quaife made diff covers. Anyone familiar with US sellers?

No, I'm only familiar with Birds and Schmiedmann.

http://www.birdsauto.com/parts/L8733879188

http://www.schmiedmann.co.uk/en/prod...product=QUAFDC

Bimmer-Bob · 12-29-2014, 08:10 AM

Quote:

Originally Posted by Suprgnat

No, I'm only familiar with Birds and Schmiedmann.

http://www.birdsauto.com/parts/L8733879188

http://www.schmiedmann.co.uk/en/prod...product=QUAFDC

Thanks! That's about half the price of the VAC cover, and from a brand I trust much more.

The only thing I'm not sure about is it says it fits all E82 models, which obviously can't be true since 135i's need a bigger diff cover. Unless they have multiple sizes under the same part listing. They do ask for a VIN, so that may be the case.

I've ordered from Schmiedmann a couple of times before and wouldn't hesitate to do so again. The only thing is, from what I've heard, a finned diff cover isn't really needed with a Torsen-type differential because they don't generate as much heat as clutch-types. Sure looks cool, though!

Anyway, thanks for the tip!

3002 tii · 12-29-2014, 08:29 AM

Quote:

Originally Posted by Bimmer-Bob

Did you go with stock final drive ratio? I can't remember if I've asked you about this before - I seem to recall discussing a 3.46 or 3.73 final drive with someone.

Kept the FD of 3.46 on my Z4.

TheSt|G · 12-29-2014, 08:48 AM

Quote:

Originally Posted by Bimmer-Bob

I checked the VAC site & the only 1er diff covers I saw were for the large 135i diffs.

Didn't even know Quaife made diff covers. Anyone familiar with US sellers?

I ordered directly from Birds and got the 125i/130i version.

Bimmer-Bob · 10-01-2015, 11:44 AM

Quote:

Originally Posted by Kgolf31

I talked with Dan at diffs online and he was in agreement that a 30/90 setup with low static lock would be ideal. Low lock on decel (essentially the static lock) would basically eliminate all potential push.

This is most likely what I'm going to get within the next month or so once I allocate my funds

Is a 30/90 what you ultimately ended up going with? And did you do their standard 40% static lock or a lower, custom value?

TIA

Kgolf31 · 10-01-2015, 11:55 AM

Quote:

Originally Posted by Bimmer-Bob

Quote:

Originally Posted by Kgolf31

I talked with Dan at diffs online and he was in agreement that a 30/90 setup with low static lock would be ideal. Low lock on decel (essentially the static lock) would basically eliminate all potential push.

This is most likely what I'm going to get within the next month or so once I allocate my funds

Is a 30/90 what you ultimately ended up going with? And did you do their standard 40% static lock or a lower, custom value?

TIA

30/90 yes. I don't know exact lock, but it was really low and now standard

Bimmer-Bob · 10-01-2015, 12:15 PM

Quote:

Originally Posted by Kgolf31

30/90 yes. I don't know exact lock, but it was really low and now standard

Will probably go for the same diff, but with a more aggressive final drive. Unfortunately that means screwing up SCCA classing, but I don't have Nationals aspirations and don't think I want to pass up on the opportunity to make the car more fun. I guess I can still drive open class or whatever at regional events?

Kgolf31 · 10-01-2015, 12:20 PM

Quote:

Originally Posted by Bimmer-Bob

Will probably go for the same diff, but with a more aggressive final drive. Unfortunately that means screwing up SCCA classing, but I don't have Nationals aspirations and don't think I want to pass up on the opportunity to make the car more fun. I guess I can still drive open class or whatever at regional events?

You'll be bumped into SM I'd think.

ASP would require you to go to a ratio that is available within the current chassis IIRC.

Either way, you'd still be able to run something.

Blacksport · 10-07-2015, 01:52 PM

Just bought a Wavetrac for my 128...(got it for $1190)

With the Stage 3 & headers, it definitely needs help now...

I'm having the guy at DiffsOL send me carrier bearings and some shims...(pulling carrier bearings is tough)...I'll press the new bearings on, bolt the ring gear on (not changing from 3.23), set the backlash, check the gear pattern...done deal.

Blue78 · 10-14-2015, 01:57 AM

evolution42 can you you let me know if you noticed a big difference between the Quaife and the OS giken?

I have a 2010 130i and am thinking about getting one of them?
I use this as my daily driver and do about 25.000km each year.
Just want to have some more fun and occasionally use it for a drift.
Later on, in 4y time I will convert it to my trackcar.

Blue78 · 10-15-2015, 03:12 AM

also thinking of switching to 4.1 or 3.91....
not sure..

12-26-2014, 12:52 PM	#69
Kgolf31 Brigadier General 461 Rep 4,531 Posts Drives: 2007 Z4MC, 2012 128i Join Date: Sep 2008 Location: Ohio iTrader: (4)	Interesting. If I could turn off the E-LSD that would be ideal.
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12-26-2014, 02:40 PM	#70
Pyrat 2 Colonel 1421 Rep 2,560 Posts Drives: Rapidly from A to B Join Date: Jun 2005 Location: Chicago 'burbs or TN Smokies iTrader: (3) Garage List 2022 Porsche GT4 [9.64] 2018 Porsche GT3 [9.33] 2007 Z4 M Roadster [8.33] 2020 BMW X1 [0.00]	I haven't experienced any of the open diff effect on my quaife at the track with my 135. I've had about 14 full track days on the diff so far. Maybe in theory it will go open but in practice it doesn't. or at least it hasn't to me. I have a plate type LSD on my 330 and I have noticed lock induced understeer on several occasions. Certain turns on certain tracks and every time I hit the same corner. That's why I switched from plate to quaife when I bought a diff for my one. __________________ '07 Z4MR '22 GT4 '18 GT3 '16 GT4, '16 M2, '14 X1, '13 135is, '06 330i, '03 323 Ci, '01 330i, '99 M3 (RIP), '96 318is, some non-BMWs
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12-26-2014, 05:07 PM	#72
skyscraper_g80 First Lieutenant 372 Rep 339 Posts Drives: 2022 G80 M3 Competition xDrive Join Date: Sep 2005 Location: Sydney iTrader: (0) Garage List 2022 BMW M3 Competi ... [0.00] 2006 BMW 130i M-Sport [8.50] 2007 BMW 335i M-Sport [10.00]	Reason why you probably haven't noticed the open diff effect is because the eDiff would work in conjunction with the LSD, so whenever one wheel completely lifts of the ground and starts spinning, the eDiff will catch it. If I had a 135i with a Quaife, I'd actually keep the eDiff on and not try to code it out. I have a 130i without eDiff and used to run a Quaife. Definitely noticed open diff effect in certain conditions. Have since changed to an OS Giken Superlock which eliminates the open-diff effect.
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10-07-2015, 01:52 PM	#86
Blacksport Second Lieutenant 54 Rep 246 Posts Drives: 2013 128i Join Date: Oct 2013 Location: Ft Lauderdale iTrader: (0)	Just bought a Wavetrac for my 128...(got it for $1190) With the Stage 3 & headers, it definitely needs help now... I'm having the guy at DiffsOL send me carrier bearings and some shims...(pulling carrier bearings is tough)...I'll press the new bearings on, bolt the ring gear on (not changing from 3.23), set the backlash, check the gear pattern...done deal. __________________ '13 128i 6sp, '19 Cherokee Ltd 3.2, '17 Ducati SuperSport S *Gone But Not Forgotten:* 74 Z28, 77 Datsun 280Z (1st 5sp in US), 92 Nissan 300ZTT, 94 MB SL600 V12, 01 M Roadster, 66 Yamaha TwinJet 100, 70 Suzuki X6 Hustler *Race:* GP/FP Spitfire SCCA, Merlyn FF SCCA, Mazda RX7 IMSA GTU, Yamaha FZR 400 AMA.
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10-14-2015, 01:57 AM	#87
Blue78 Registered 0 Rep 2 Posts Drives: 130 Join Date: Oct 2015 Location: Belgium iTrader: (0)	evolution42 can you you let me know if you noticed a big difference between the Quaife and the OS giken? I have a 2010 130i and am thinking about getting one of them? I use this as my daily driver and do about 25.000km each year. Just want to have some more fun and occasionally use it for a drift. Later on, in 4y time I will convert it to my trackcar.
	Appreciate 0 Quote

10-15-2015, 03:12 AM	#88
Blue78 Registered 0 Rep 2 Posts Drives: 130 Join Date: Oct 2015 Location: Belgium iTrader: (0)	also thinking of switching to 4.1 or 3.91.... not sure..
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