[kujo]

Extra power won't make a whole lot of difference.

I can't imagine that Quaife would use a set of clutches that can't take the torque.
It's all down to how the springs packs work in a clutch style LSD.
A more aggressive spring pack just makes the LSD put the power to the other wheel quicker/more aggressively.

I'd assume that most people buying this LSD will be doing power increasing mods, so they should just make the LSD more aggressive from the get go.

kj

[Orb]

The Qualify LSD is so far from being the weak link in the system and you really shouldn’t worry about this at all.

The system doesn’t not use any clutch/ramps ect. It does however use a very cleaver design that incorporates floating helical gears and springs. To be honest is a bit complicated to understand but superior to any other system. The unique thing about the systems is it ability to bias torque before any wheel spin happens. However, if you do have enough torque through the system then obviously both wheels will spin but they biasing will be give to the wheel with the most traction. Be careful what you read out there as so many common mistake saying (0 ft-lb x 10 ft-lb = 0) which is not true as there is always a resistance although it may near be zero is still is not. Like typical clutch style LSD there is some preload designed into the system. The typical biasing is usually set 4:1 to 5:1. I see that a few want an aggressive setup but this by itself it subjective. Do you want predictable lock drifting at 100 MPH or do want better autocross performance. When you custom tailor a device like this to given circumstance then you will give up performance in another area. The Qualify by it design it pretty flexible and will work well in almost all circumstance. As part of the specification Xede performance capabilities have been included.

I have been keeping notes on all of the comments so they will be addressed.

The thing I like most about the system when compared to the clutch style LSD is that I will not have to replace the clutch after 30,000 miles or change the oil frequently.

Here few links that help give you an idea:

http://www.roadraceengineering.com/quaife.htm
http://www.autotech.com/quaife/index2.htm

Originally Posted by kujo

Extra power won't make a whole lot of difference.

I can't imagine that Quaife would use a set of clutches that can't take the torque.
It's all down to how the springs packs work in a clutch style LSD.
A more aggressive spring pack just makes the LSD put the power to the other wheel quicker/more aggressively.

I'd assume that most people buying this LSD will be doing power increasing mods, so they should just make the LSD more aggressive from the get go.

kj

[schneid4323]

yeah sorry I didnt respond sooner, I would love one

[RichP]

Sounds great. I dont know if there is a need for customization whatsoever; this is going to offer such a benefit to these cars in any form. I only mentioned the XEDE earlier because it makes ALOT of torque compared to any BMW before it, and there may be a limit as to what the quaife can manage in an given application.

In terms of amount lock and "aggressiveness" does having a very aggressively locking differential put additional strain on the drivetrain, and more importantly, the differential mount and subframe? Although the E90 is a new rear-end design compared to E46; overall, BMW has a lengendary history of weak differential mounts and subframes. I would definitely want to sacrifice some differential "performance" for differential safety.

[kujo]

Great read.
I don't know why I thought the Quaife's were a clutch style LSD.

This is even a better venture than I thought it was.

kj

[Dr.Sommer]

What can be seen from the drawings on the links above, the Quaife is a Torsen Type Diff., right?

[Orb]

You can get a bit more information at this site: http://www.sonic.net/garyg/zonc/Tech...fferential.htm

I really don't see any problem using the xede system on the car for anything . It really is not a lot more power for the stage 0 system.
You can get a bit more information at this site about locking which should be close to what you will see in the Quaife: http://www.sonic.net/garyg/zonc/Tech...fferential.htm

I really don't see any problem occurring for any reason using the Xede. It is not a lot more power for the stage 0 system in the big picture. A LSD differential will reduce stress since it prevents wheel spin which causes shock loads and this is the worst case scenario since it accelerates fatigue. In short , it i not going to induce more stress but rather distribute it over a larger area which is a good thing.

Originally Posted by RichP

Sounds great. I dont know if there is a need for customization whatsoever; this is going to offer such a benefit to these cars in any form. I only mentioned the XEDE earlier because it makes ALOT of torque compared to any BMW before it, and there may be a limit as to what the quaife can manage in an given application.

In terms of amount lock and "aggressiveness" does having a very aggressively locking differential put additional strain on the drivetrain, and more importantly, the differential mount and subframe? Although the E90 is a new rear-end design compared to E46; overall, BMW has a lengendary history of weak differential mounts and subframes. I would definitely want to sacrifice some differential "performance" for differential safety.

[Gen_E92]

Don't get mad at me if this is a stupid question. Wasn't torque biasing diff different from a lsd?

[RichP]

Originally Posted by Orb

A LSD differential will reduce stress since it prevents wheel spin which causes shock loads and this is the worst case scenario since it accelerates fatigue. In short , it i not going to induce more stress but rather distribute it over a larger area which is a good thing.

Interesting way of looking at it, makes sense to me.

Damn, I cant wait to have an LSD in one of these cars..its going to be insanity.

[uhaulball]

Originally Posted by Dr.Sommer

This feature was cancelled on the E9x models - THANKS BMW CONTROLLING!!!

can u explain this feature? adaptive redline:?

[Dr.Sommer]

Originally Posted by uhaulball

can u explain this feature? adaptive redline:?

>Have a look at this<

[Robin_NL]

anybody more for EU?

[roller84]

1. Kujo
2. RichP (tentatively on specfication being meet)
3. Specialque
4. Stressdoc
5. Patric 335
6. bmwmike
7. Orb
8. sdiver68 (tentatively on specfication being meet)
9. Ryan(E92)
10. Aznevoviii
11. Turbocoins
12. daisy16905
13. DanHarman
14. Timn
15. Ac2
16. magmd (tentatively on specfication being meet)
17. Chaotic604
18. Driver72
19. roller84
20.
21.
22.
23.
24.
25.

[oreo]

Originally Posted by Robin Hood

anybody more for EU?

I am EU as well and definitely interested in one for my E87 130i!

I am in contact with Quaife in the UK to explore whether they can be part of this group buy on our behalf and sell the units to us in the EU from their UK branch. I'll update when I get to know more!

[schneid4323]

1. Kujo
2. RichP (tentatively on specfication being meet)
3. Specialque
4. Stressdoc
5. Patric 335
6. bmwmike
7. Orb
8. sdiver68 (tentatively on specfication being meet)
9. Ryan(E92)
10. Aznevoviii
11. Turbocoins
12. daisy16905
13. DanHarman
14. Timn
15. Ac2
16. magmd (tentatively on specfication being meet)
17. Chaotic604
18. Driver72
19. roller84
20. schneid4323
21.
22.
23.
24.
25.

[inTgr8r]

FWIW...
I installed a Quaife in my G35.
Of the many mods done on that car, the Quaife was def one of the best things I did.

Very high quallity product, seemless operation.
No snapping popping & grabbing the way a clutch LSD does.
For the G35 it was $1400.
Installing in the diff $300
I did the re&re myself.

[oreo]

I got the following reply from Quaife in the UK:

"Quaife America does not exist as a company now, however Autotech are the same people but with a different name. They will still deal with Quaife products, and will still arrange group purchases.

To clarify - every Quaife product is manufactured in England, so in the end any samples would come to us."

And regarding the opportunity for a group buy directly from the manufacturer:

"We need an order from 1 person for a minimum of 10 units. This person would be at the head of a group buy. It is irrelevant where the members of the group are located. If the group is mixed between Europe and the rest of the world, then as long as we are dealing with one person it is ok.

We will not offer a quote for this purchase until we see a sample standard differential unit, and can offer a unit price when we know the final number of units being ordered."

[Orb]

Update:

We have someone who has volunteered their 335i for 2 days so it will be possible for this project to go ahead. We all owe a big thanks to the person who is donated their car for measuring.

As mention by another person in this thread Quaife usually does not take individual order for group buys but in this case they will due to strong initial demand, but it does require you to be prompt in making a commitment for all those who are on the list.

Quaife is taking orders for BMW 335i/330i ATB Differential effective today. Please contact:

Contact: Rafael
Company: Autotech Sports Tuning
Phone: 1 949 240-4000

Rafael is expecting calls from you all and will be available to answer all your questions.

Quaife will provide a quote, terms and delivery time once the scope of work has been completed which means they need have 335i differential fully measured (expected to be completed by the end of next week) in order to quote. The cost is estimated to be at 1495.00 USD. Once you received your quote you will be required to place a deposit.

There is a time limit to place the initial orders so at least 15 people must have done so no later than February 15th or the project my be cancelled. Please remember that the company has made an exception in the purchasing policy so I would urge you all to place your order today.

I’m the first to place an order so who is next………

[kujo]

My order's in !!!!!! :-)

[///Matt]

That's awesome that this is going ahead. I REALLY wish I had a spare $1500 laying around, I'd be in.

[RichP]

Ill give a ring later today or monday at the latest..come on guys...dig deep!

[turbocoins]

I signed up--They're taking names and phone numbers now, couldn't give an estimate on production date, etc. No credit card numbers yet.