New LSD Option Coming out soon

[ScrotieMcBoogerBalls]

Kaaz is releasing a 1.5 and 2 way differential for the E92 Bmw 335i.
The price will be $1695 and will be a good option between the Quaife and OS Giken. The Super Q Will retail at $1895
First shipment from Japan within the next few months.

[Forced Air]

Personally I would still recommend torque biasing mechanical diffs that don't wear out. Unless you are really doing some hardcore tracking or trying to build a drift car.

But it is always good to see more options from reputable companies out, for a decent price to. The option of a full 2 way will be great for some track rats.

[Sticky]

Personally I would still recommend torque biasing mechanical diffs that don't wear out. Unless you are really doing some hardcore tracking or trying to build a drift car.

But it is always good to see more options from reputable companies out, for a decent price to. The option of a full 2 way will be great for some track rats.

More options are a good thing.

Which diff would you recommend and why?

[ScrotieMcBoogerBalls]

Clutch discs are best, period.

[Forced Air]

I may have been a little to unspecific with my terminology in my first post so let me correct it by saying...

- I prefer torque biasing (most clutch type are this actually) over speed because it never actually locks the shafts together, around 75-80% bias is the max for any brand I believe. Which is great for handling how the car is expected to as well as for performance when it comes anything involving turns...as well as straights. Most speed biasing are not used in the sports car aftermarket anyway...Nissan uses viscous which is smooth but limited and generates significant heat. Things like Mitsu's electronic stuff is technically speed based but operated more like a high tech selectable locker (traditionally for off road use).

- I prefer gear based over clutch because the clutched wear, rather quickly in many cases and they generate a whole lot of heat. The is especially true in a torque biasing diff because, like i said above, it never is actually fully locked and in most of its operation is far less than 80% locked. Also, because my car is a street car and my dd driving with anything over a 1 way is rather unsafe (especially if the wife were in it) and rather unnecessary. a light 1.5 way maybe but really no need. Aggressive 1.5 would be great for a track car...I can't see needing a 2 way unless I was building drift car.

So in sort gear over clutch because of safety, predictability, longevity and need really (don't need more than 1 way). The only real downside is that gear based will not provide any locking action if there is not torque difference...so if one wheel lifts completely in a turn or you were to get on very slick ice...you can counteract this by applying brake to give the wheel something to push against (similar to brake boosting a turbo).

So that would be Quaife and Torsen (Wavetrac is Torsen type), with Wavetrac having some advantage in tech with a "no-load" traction feature to counteract the above mentioned issue.

This is not to say clutch type don't have their uses...if you have a heavily tracked (as in road raced) car and a 1.5 way is need the gear type is the way to go. Unless there is some other point i have forgotten or never heard about of course.

That was long, sorry about that.

[Sticky]

That was long, sorry about that.

It was good is what it was.

[ScrotieMcBoogerBalls]

Guess its just a matter of opinion. For a car with serious power, you need clutch pack LSD. If you have ever driven in a OS Giken or Kaaz, and a Quaife, you will feel a huge difference.

http://grassrootsmotorsports.com/articles/whats-diff/

[Forcefed]

Will they have an option for a E90 A/T?

[ScrotieMcBoogerBalls]

Will they have an option for a E90 A/T?

Not sure.
I am trying to get the owner to post here, LOL.
He said he may want to do a group buy, we will see.

[Forced Air]

Guess its just a matter of opinion. For a car with serious power, you need clutch pack LSD. If you have ever driven in a OS Giken or Kaaz, and a Quaife, you will feel a huge difference.

http://grassrootsmotorsports.com/articles/whats-diff/

Don't get me wrong...if I were building a dedicated track or even if i just had a different car a dd more and this was a track/sunday driver i would say clutch due to the ability to run a 1.5 and less mileage so no worries about it wearing.

Also that article only tested a stock S2000 Torsen type...they aren't all the same...for example they mention understeer, as we all know manufacturers almost always build in understeer (even in RWD BMW sports cars) to keep the average soccer mom safe. Plenty of torsen units have a much higher bias ability (near same as clutch type) which allows a near full lock behavior if you are trying to power over. Wavetrac even has developed a unit that resists the normal torsen characteristic of not working if one wheel is in a zero traction state.

[Forced Air]

All of that being said...if the price is good the difference is going to be negligible for most so jump on it.