M Performance Parts LSD.... Drexler ?

[Dackelone]

So yesterday we saw the BMW M235i M Performance Parts LSD on the front page of Bimmerpost.com


I was looking at the LSD and I knew something looked familiar to me. With the help of some "friends", I now know. That logo on the Perf LSD looks exactly like the Drexler LSD logo. Btw... Drexler makes LSD's for Alpina.

http://drexler-motorsport.eu/page/de...motorsport.php

[Acheron83]

Interesting. Now who is going to be the first to discover whether we can fit them to the 1-series

[RimasRS]

I dont think it can be drexler because drexler is clutch type LSD it would be to different to M variable. Though everything is possible...

[Dackelone]

Originally Posted by RimasRS

I dont think it can be drexler because drexler is clutch type LSD it would be to different to M variable. Though everything is possible...

I don't know. But that logo sure looks like a Drexler image to me.

[RimasRS]

Originally Posted by Dackelone

I don't know. But that logo sure looks like a Drexler image to me.

A sorry missed the logo. I guess you are right. So that means M performance LSD will have clutch type LSD. Interesting BTW is that confirmed that LSD will be included in to Performance parts list?

[Kgolf31]

I don't think it is any surprise:

http://www.drexler-motorsport.com.au/products.html#BMW

[dm135is]

Natch - I just put a Performance Gearing clutch-type LSD in my 135i last week.

Anyone know how the Drexler LSD compares to a standard clutch-type LSD on performance & price?

[Dackelone]

The German car magazine Auto Motor Sport has reported that the: "Performance LSD... only aftersales(not factory installed), 2800€, 30% lock out..."


What doe you guys think? I think that is a crazy high price!!!

Btw... a basic Drexler LSD sells for ~2400€.

[ShocknAwe]

I think the price is a little steep personally. Also, isn't a 30% lock a little low?

[MightyMouseTech]

Wow, and I thought the Quaife for our cars was expensive.

[Kgolf31]

Originally Posted by ShocknAwe

I think the price is a little steep personally. Also, isn't a 30% lock a little low?

Really it ultimately depends on the application. Though question to answer

but, for those in this thread, take a look:

128: http://diffsonline.com/bmw-128-diffe...l#.UufDYxAo7IU
135: http://diffsonline.com/bmw-135-manua...l#.UufDUBAo7IU

[TheSt|G]

Originally Posted by ShocknAwe

I think the price is a little steep personally. Also, isn't a 30% lock a little low?

For a clutch based diff, that is a pretty normal lock for street applications from the factory.

M Variable lock is the real outlier in factory diffs.

[Dackelone]

Originally Posted by ShocknAwe

I think the price is a little steep personally. Also, isn't a 30% lock a little low?

Yes, I think its low too.

Originally Posted by MightyMouseTech

Wow, and I thought the Quaife for our cars was expensive.

Its looking like the Wavetrac is the winner so far to me. Maybe with the Quaife a close second. But thats just my personal opinion. I guess it all depends on what your after in a LSD.

[Kgolf31]

Originally Posted by Dackelone

Its looking like the Wavetrac is the winner so far to me. Maybe with the Quaife a close second. But thats just my personal opinion. I guess it all depends on what your after in a LSD.

The fact that a lifting wheel and you lose the whole lock and default back to an open diff kills it for me on those. Simple example, you can be driving on the track, hit the curbing candy cane and as you come off the curb, your rear wheel gets air. At that time you go to an open diff, and next thing you know you're pointed at the wall.

Clutch LSD is IMO the proper way to go.

From diffs online:

Our 2 clutch option is a BMW limited slip carrier which uses the traditional 2 clutch setup. This unit is set to 40% static lock unless a lower amount is requested by the customer and utilizes the stock ramp angles of 45/45 (accel/decel). This limited slip is much more durable than the factory M Variable unit and is well suited for street and track use. For street only use the Redline 75w90 is recommended and for a vehicle which sees a lot of track time and abusive driving the 75w140 fluids should be used to provide additional gear protection under extreme conditions.

Our 3 clutch option is a BMW limited slip carrier with a third clutch pack. This unit is set to 40% static lock unless a different amount is requested by the customer and utilizes the stock ramp angles of 45/45 (accel/decel). This limited slip is much more durable than the factory M Variable unit and is well suited for street and heavy track use. For street only use the Redline 75w90 is recommended and for a vehicle which sees a lot of track time and abusive driving the 75w140 fluids should be used to provide additional gear protection under extreme conditions.
Our 3 clutch option with 30/90 ramps is a BMW limited slip carrier with 3 clutch packs and the ramp angles are modified from stock. This unit is set to 40% static lock unless a different amount is requested by the customer and uses ramps which are modified to 30/90 (accel/decel). This limited slip is much more durable than the factory M Variable unit and is well suited for street and race use. For street only use the Redline 75w90 is recommended and for race application the 75w140 fluids should be. The QUAIFE ATB differential is a torque biasing carrier. We recommend Redline 75w90 for this application.

[Nugget]

I thought the Wavetrac avoided that problem.

[GR1P]

Originally Posted by Nugget

I thought the Wavetrac avoided that problem.

It does. The Wavetrac is a hybrid lsd to avoid the open diff problem once a tire is lifted.

BTW I have it installed on my 135is and can highly recommend it.

[MightyMouseTech]

Originally Posted by Kgolf31

The fact that a lifting wheel and you lose the whole lock and default back to an open diff kills it for me on those. Simple example, you can be driving on the track, hit the curbing candy cane and as you come off the curb, your rear wheel gets air. At that time you go to an open diff, and next thing you know you're pointed at the wall.

Clutch LSD is IMO the proper way to go.

From diffs online:

I would think this would be fixed by the ediff? Finally, a reason to actually have it! Lift a wheel and the car will engage the brake on that wheel enough to engage the Torsen style diff. Win-Win no?

[Kgolf31]

Originally Posted by MightyMouseTech

I would think this would be fixed by the ediff? Finally, a reason to actually have it! Lift a wheel and the car will engage the brake on that wheel enough to engage the Torsen style diff. Win-Win no?

The e-diff is a reactive function, not proactive.

Yes, in thinking the e-diff will help keep lock in the system, but i don't think it will help prevent spinning a wheel during lift unless you're dragging the brakes at apex.

I'm use to driving on a M-Diff from my Z4. So a clutch-style LSD is up my alley. Of course now we're talking about a M-Variable Diff, which is a different story

One of the biggest downfalls on the Quaife is the fact that during coast, or braking when you're off the gas it resorts back to an open diff. The Wavetrac is suppose to help this with with minimal lock, but it isn't close to a 40% lock like a clutch type

[TheSt|G]

Originally Posted by Dackelone

Yes, I think its low too.

I suspect that this diff, like all the low lock LSDs Porsche ships, will be burnt out in short order on the track.

[MightyMouseTech]

Originally Posted by Kgolf31

Yes, in thinking the e-diff will help keep lock in the system, but i don't think it will help prevent spinning a wheel during lift unless you're dragging the brakes at apex.

I'm use to driving on a M-Diff from my Z4. So a clutch-style LSD is up my alley. Of course now we're talking about a M-Variable Diff, which is a different story

One of the biggest downfalls on the Quaife is the fact that during coast, or braking when you're off the gas it resorts back to an open diff. The Wavetrac is suppose to help this with with minimal lock, but it isn't close to a 40% lock like a clutch type

As soon as a wheel lifts, like when hitting a curb, the ediff should immediately try and compensate and grab the brake on that wheel, as soon as it grabs, a torsen diff should start working again. Was just thinking the ediff would make one just a little better.

Just curious, why would you not want an open diff when braking or coasting?

I am very partial to Torsen style diffs personally. I have had them on several race cars (Hondas) and several street cars. I really like the way they race and drive on the street.

[Kgolf31]

Originally Posted by TheSt|G

I suspect that this diff, like all the low lock LSDs Porsche ships, will be burnt out in short order on the track.

Really? You think that?

Originally Posted by MightyMouseTech

As soon as a wheel lifts, like when hitting a curb, the ediff should immediately try and compensate and grab the brake on that wheel, as soon as it grabs, a torsen diff should start working again. Was just thinking the ediff would make one just a little better.

Just curious, why would you not want an open diff when braking or coasting?

I am very partial to Torsen style diffs personally. I have had them on several race cars (Hondas) and several street cars. I really like the way they race and drive on the street.

FWD Torsens are completely different than RWD. IMO, Torsens on a FWD is the way to go. On a RWD though...never, just IMO for a hard use application.



The thing with the e-diff, is that it isn't proactive. It doesn't know you're hitting a curb. Once you hit the curb, you'll get air, the wheel will start spinning then the e-diff needs to react. Within the split second this happens I still don't believe the e-diff will catch it.

Open diff while braking especially doesn't help with car control. When you have a static lock on a LSD, you can gain stability. When coasting, you can easily be taking a sweeper or some sort of turn on a lift and when you go back to open diff.

[TheSt|G]

Originally Posted by Kgolf31

Really? You think that?

I'd love to be wrong, but for pretty much every Porsche with a LSD, they burn out quickly. I don't see BMW's being a higher spec than theirs.

And yes, the GT3 suffers from this as well.