MFactory Helical LSD's - Lifetime Warranty, 30-Day Money Back Guarantee!

[MFactory]

Helical LSD


Gain a prominent advantage over the competition with the MFactory Helical Limited Slip Differential. Through the smooth and constant distribution of power to the wheels, the MFactory Helical LSD puts the power-to-the-ground and maximises your vehicle's traction. A must for any race car, be it Street, Strip or Track!

Diamond Cut to exacting tolerances from Forged High-Nickel-Chromium-Molybdenum Steel
Perfect fitment & finish ensures hassle-free installation & maintenance, each and every time

Designed using leading-edge Solidworks 3D CAD & Cosmos FEA software
Advanced Gear Geometry minimizes parasitic drivetrain losses. Race transmissions built with MFactory components transfer, on average, 1-2% more power to the ground over our competitors!

Stress Tested on loaded dynos
Ensures our differentials are strong enough to handle the shock loads encountered during racing, yet also durable enough to handle the variable loads encountered during day-to-day driving.

2nd Generation Design
The MFactory v2 Helical LSD is lighter, stronger and more efficient than any other Helical LSD on the market today!

Covered by the MFactory Feel The Torque™ 30-Day Money Back Guarantee!
An Industry First! If you do not feel the difference after installing your new Limited Slip Differential, you may return the product to us for a full refund (excluding shipping costs) within 30 days of the purchase date

Covered by the MFactory Lifetime, Globally Transferable Warranty
Whether used on the Street, Strip or Track, all MFactory Helical LSD's come with a Lifetime, No-Hassle, Globally Transferable Warranty

No-Load/One-Wheel Syndrome
A common misconception is that a Torsen-Style Differential is useless under a no-load situation (e.g One wheel in the air). Although true to an extent, this no-load situation does not apply to the modern day car with Traction Control (or eDiff). For those without traction control, there is a very commonly used solution to the problem (used by professional race car drivers over the past 30+ years) that our competitors will not tell you; simply left-foot brake

Manufacturing Process
- SAE9310 Bar Stock imported from Japan to ensure the purest steel grades
- All MFactory components are Forged. We do not use inferior Cast or Billet processes. Forged components are upto 30% stronger & tougher than the equivalent "Billet" component. Click here for further details
- Advanced material processing, heat treatment & finishing techniques offer superior strength, durability and quality
- Primary Heat Treatment: After the forged parts come off the press, they are Normalized and Annealed to relieve residual stresses and make them machine workable
- Machining: After the forged blanks are completed, we use Industry-leading Multi-Axis CNC and CAM equipment to machine the parts
- Secondary Heat Treatment: State-of-the-art Case Hardening procedure achieved via computer-controlled Gas Carburization and Quenching
- Double-Tempering: A superior heat treatment technique used to decrease the brittleness and increase the toughness of our parts
- Surface Grinding: Through the use of our state-of-the-art diamond grinding machines, we ensure all parts are smooth, precise and free of burrs
- Super Sub-Zero Processing: An advanced treatment technique whereby the parts are cryogenically hardened at -300°F, realigning the steels crystalline structure for maximum strength, then heat tempered again for a 3rd time to ensure maximum toughness (resistance to fracture)
- Micro-Peening: Our final treatment stage, the parts are subject to a high speed shot blast with our proprietary micro media, creating a super smooth surface

Brand Comparison


Fitments/Price
E55 AMG W211
E63 AMG W211
E63 AMG W212
C55 AMG W203
C63 AMG W204
SLK55 AMG R171
SL65 AMG R230

LSD Only - $999.95 inc FREE Shipping within North America & Europe

Rebuild Service: Ship your pumpkin to us, or we can use a pumpkin that we have in stock, and we'll handle the rest!
- Prior to assembly, all parts are cleaned, inspected, and polished in a deburring machine with ceramic media
- Preload, gear clearance and torque will all be inspected and adjusted for superior performance
- Housings are media blasted to give a 'better than new' look
- Simply add $500 onto the cost of the LSD for this rebuild service
- If you wish us to ship you a pre-built pumpkin first, there is an additional $500 core charge. This is refundable after we receive your old pumpkin back

Some images of a recent rebuild (this is for a BMW):

Before:


Cleaned in our Ceramic Tumbler:


LSD Installed:


Finished Pumpkin:

For further information, please CLICK HERE to Contact Us, or send us a PM

About MFactory
Established in 2004, MFactory Competition Products has since grown to become one of the Leading Global Manufacturers of high performance off-the-shelf aftermarket transmission components, with our large range of Forged Final Drive Gears, LSD's and Close Ratio Gears offering enthusiasts undeniably THE most cost-effective method of performance improvement, far surpassing that of conventional engine tuning.

Being a specialist in this industry requires focused knowledge that can only be gained through years of first-hand testing and tuning experience. Challenging the old adage that 'there is no replacement for displacement', MFactory Competition Products have become a prominent figure in the highest levels of Motorsport, with class-leading recognition the world over in Circuit Racing, Drag Racing and Rally.

Every product within the MFactory catalog is designed in-house in the USA and manufactured in-house to our own specifications at both our US R&D Facility and our multi-million dollar, state-of-the-art, ISO Regulated Taiwan factory, before being tested & developed in the real-world on state-of-the-art race vehicles from North America, Europe and Asia-Pacific. Our products are designed from the beginning to surpass the competition. Why choose MFactory? Here's why:

Official OEM to Honda of America's Motorsports Divisions
World's Largest Manufacturer of Forged Performance Transmission Components for Japanese and European Automobiles
North America's Largest Manufacturer of Limited Slip Differentials for Japanese and European Automobiles
North America's Largest Honda/Acura Performance Transmission Specialist
The World's Only Performance Transmission Manufacturer to offer a 30 Day Money Back Guarantee!
The World's Only Performance Transmission Manufacturer to offer a Discounted Trade-in for a Competitors Product; even if it's damaged!

Want more Information? To view our complete company profile and manufacturing processes, please CLICK HERE to visit our website

Some Customer Reviews

Hi guys, thought I'd post a quick review of the MFactory LSD on my E92 335i. I had this (and a few other goodies) fitted by Advan Performance not long ago.. I can't speak highly enough of Advan Performance and BMR Autowerkes - they've been my one stop shop for mods.

It's been pissing down rain recently in Sydney, so I haven't tested the LSD in anger (nor with DSC/DTC off - will try this some time in future). In the wet, the difference is night and day with the LSD. The traction control lights used to go bezerk even during light throttle, but with the LSD fitted, the car grips and accelerates far better in the wet, and requires much more throttle for traction control to kick in. Definitely much better grip, acceleration and predictability when accelerating in the wet.

In the dry the difference is especially noticeable coming hard out of tight corners. The traction control won't react fast enough to catch the car before it slides out slightly, so beware of this. In a straight line (in the dry) the traction control definitely kicks in less with aggressive driving, but with the power the car puts down, its impossible to avoid wheel spin if you mash the accelerator (JB4/downpipes) - need to learn to gradually apply throttle to the point just before loss of traction. Hard to feel whether acceleration off the line has improved much, but I'd imagine so.

The MFactory LSD is very quiet, except there is some slight delayed backlash(?) noise when I come off the throttle after accelerating hard. I'll get this checked out when I get the car serviced in the next month or so (and diff oil changed out), but even if this noise is normal, I could easily live with it.

Was it worth the money? Probably, for the sake of occasional spirited driving and driving in the wet.. but I'd imagine most of the benefits would be seen on a track.

Let me first say that I was a little skeptical of putting anything except an OS Giken, ATS/Carbonetic or Quaife in my 135i. I've had experience with all 3 brands, plus Kazz in my past cars and the LSD is a huge part of how the car feels navigating corners on the track and the twisties.

Enter MFactory with their excellent customer service and very fairly priced product:

While surfing the forums and killing some time while at work, I started to read up on their thread. I can't lie, the price was the first thing that attracted me. For under a grand, I could get a forged helical LSD unit that would suit the needs of what I had planned for my 135i. A low noise, stealthy daily driver that was fun to drive. What really appealed to me was they had built pumpkins with a 3.46 final drive and LSD in stock for under $2000 shipped (if you send back your core). At that price, I bit the bullet and eagerly awaited my new purchase.

During the time, I was installing M3 arms front and back along with the BMW Performance suspension. Already installed is a Cobb V3 and downpipes. Even with those mods, I was having serious traction issues in first and second gear. Before getting any more performance mods, a LSD needed to be addressed.

Once all of it was done, the 135i honestly feels like a completely different car. Two years ago, I had a chance to drive the 1M and my 135i is coming close to what that car felt like. The MFactory LSD and suspension really transformed the vehicle. I've had about 4 full days of driving it with the LSD and I'm very impressed. Obviously, since the diff was already installed, I didn't get to see the quality of the item first hand. But knowing it's a forged unit and now my traction issues has been addressed, I'm a happy camper! I can now put the power down and more importantly, hang the tail out on command. That's something I never had a chance to do as well with my Cayman S or E46 M3 since low end torque was lacking. Not to say you couldn't do it at higher speeds... but that's a little more reckless around the city!

I'm sorry for the long winded review, but for my needs and as my daily street car, this MFactory unit is spectacular. I plan to try to squeeze in an autocross or two before the winter and visit some tracks next year and I'm confident this will help. If you're looking for a quality unit without breaking the bank, I believe MFactory should be high on your list of considerations.

Got my 3.46 M/T LSD installed and wow, what a difference! I like to take corners fairly sharply and I used to feel traction breaking and the tires scrambling to get traction. Not any longer, however. The car now corners like it is on rails. Full review to follow but if you have rear wheel drive and a JB4, you are not getting all your power down. An LSD is a MUST HAVE for rear wheel drive cars with the kind of horsepower our cars have. The Mfactory LSD is very quiet (I had read some people complaining about noises from their LSDs) and works very well. The car feels absolutely glued to the ground, especially when going around corners. If you check prices, you will find that Mfactory's current pricing is a heck of a deal, particularly for the 3.46 M/T LSD for welded transmissions.

Finished the install today and went for a drive. Diving normally the car is as quiet as it was before and no vibration at higher speed so I was happy about that. The rear feels more heavy/planted in the back end going over uneven roads which surprised me....less "tail wagging". Well yes there is definetely more traction. I drove the whole time with DTC off and on a couple of the "greasy" roads where it would normally spin all through second did DSC intervene. I need to up my boost limit in second from 12psi and try again on some good roads. I tried a few mild first gear launches and seemed way better but still some controlled spinning. I did notice the small clunk from the diff when sitting still with brakes on and going from reverse to drive. From drive to neutral and back to drive there is no noise.....need to go and make sure the axle bolts are still tight ...cheers.

Same here. Just a bit of clunk from stand still to the first gear. Other than that this is one of the best mod i d ever done with a great price. No tale waggle on wot and hard first gear turn with a great control under slipping....u simly will grin after grin from the fact that this car has unlimited potential. With my new inline along with this lsd, i am back again. Kw is next.

So it took me awhile to finally write this review up, but I do have a solid amount of miles on the LSD and lockdown kit at this point which is a good thing.

I ordered the LSD through Steven @MFactory. We corresponded mostly through email, and he was always very responsive...even when traveling out of country. I did their core exchange program, and picked up a 3.46 LSD for my 6MT car, as I heard nothing but good things about the final drive change.

After they received my payment, they began reconditioning a large housing bolted pumpkin they had there and prepping it for the LSD. Once the oil seals arrived, it only took them a day to have it prepped and ready. One of the pics attached below so it in its prepped state. Shipping was fast as well, and it was at my door a few days later. It was super clean, and the pumpkin was freshly coated black I had Rick@Defiv fit me in his busy schedule for an install, and decided to get the lockdown kit done at the same time.

Rick and I had the whole diff swap + lockdown install process done in about 4hrs, including pizza and drink breaks. Not bad at all. We took it out on the road for a quick spin to verify everything was solid, then I was on my way. Thanks again Rick!

I've been driving on it for about 800 miles now over the past month or so, and I love how it has transformed the car. The LSD still adds forward thrust to the car even while spinning in 1st and 2nd. Previously, my car would get very unpredictable, and start to kick out the rear in either direction. Now it is planted and firm, just pushing you forward. Traction is greatly improved. It's also great to be able to rotate the car easily with the gas pedal going around turns and you can literally "feel" the LSD working. The 3.46 final drive + my worn tires aren't doing me any favors currently, but I will be switching to some r-comp semi slicks very soon, and going wider.

Running the Cobb Stg 2+ basemap at the strip w/ the LSD and lockdown kit, I was running consistent 12.6 @ 113-114mph all night. I couldn't get lower than a 2.0 60', but that is my tires fault. IAT's per my logs were very high too (105*+), since it was a warm night and. I fully expect to hit 12.1 - 12.2 simply with better tires. Then a PTF pro-tune to get me into the 11's on stock turbo, 6mt, 93oct.

I highly recommend that anyone making power get an LSD. You don't really know what you're missing out on until you experience it. mFactory was great to deal with and their product performs extremely well. Same goes for the defiv lockdown kit. Together, it's a killer combo.

I know a lot of people have been looking for, candid, feedback on these differentials, so here you go.
I have a 2008 135i with a bolted diff for reference.
The install was actually EXTREMELY easy, backlash on the new diff vs old was actually almost exactly the same. No trimming of the housing was required and the bearing races came right off the old and onto the new with ease.
The pumpkin came without completely pulling the driveshaft, just dropped the axels and loosened the drive-shaft nut, out it came no problem. I also installed the purple powerflex bushings at the same time, this took longer than the entire diff install as my oem ones were pretty stuck in there and you can't use heat on the thin parts of the subframe. After awhile they came out with a small press setup.
With the car back together I took it around the block a few times and can happily report no clunking going from reverse to drive, no whine, and a lot less drivetrain slop with the bushings. Traction wise in a straight line is hard to tell because i need some new rubber soon but the burnout test says that both wheels are turning Cornering now feels like I can use the skinny pedal to turn the car instead of it pushing the front until massive oversteer happens. I only have a few miles on it but I wanted to sing praise for a great, perfectly priced, high quality product. If anyone is going to put something through its paces it will be me I will be going to the track soon and will report back with long term results.

I would like to start this review by declaring that I have no affiliation with any of the mentioned companies.

I have been researching for an economical solution to add an LSD (Limited Slip Differential) on my car; E46 320CI with s/s. My requirements would be a plug and play solution without case modifications (thus eliminating clutch-based units) at a reasonable price tag. Car being 13 years old, I did not want to spend a large amount of money. The popular options that I found was the Quaife (established brand, widely used) and Wavetrac (newer brand in the BMW E46 field, higher tech, unique features), with similar price tags; (750 GBP and 1200 USD respectively).

Relatively recently, I stumbled across the LSD unit from Mfactory. I went on their website and checked in their wide model based if there is a unit suitable for my application/vehicle (mine is 3.38 final drive ratio, 188K case). I was a bit skeptical at first due to the fact that the LSD is manufactured in Taiwan (vs UK / USA for the other 2), but after reading a lot of reviews from both BMW and JDM world, I decided to proceed purchasing it. The cost was lower than the competition as well which is a big plus and also the lifetime transferable warranty.

We took the car for a (very spirited) test drive and what a difference!!! Specially in the corners, the power delivery is quite different and you can really feel the car pushing hard throughout the corner. There was no ASC intervention throughout the test drive (it was enabled) and there were no issues i.e. odd noises upon acceleration/deceleration.
Overall I am very pleased with this purchase, highly recommended to anyone considering an LSD unit. I commute around 600miles / week, so I will provide in short time a 2000 mile review.

For some reason I take the long way home instead of the short .
The diff is still super quiet, no leaks/noises. There is no increase on the case temperature after LSD install so I will skip the Z4 finned cover for now.

[Sticky]

So you offer these for more than BMW applications I see.

[MFactory]

So you offer these for more than BMW applications I see.

Yup, just finished testing on our own C63

[ricecrackers101]

does it include new bearings and axle seals?

[MFactory]

If you purchase the LSD only, no.

If you purchase the rebuilt pumpkin, yes.

[MFactory]

We have a reconditioned pumpkin/core here ready to install the LSD into, so if anyone wants to do a core exchange (i.e we send you a pumpkin first, then you send your old one back to us), we are more than happy to do so

[MFactory]

All PM's replied

[Ben-Jamin]

All PM's replied

I know this is an old thread and im not on the other forums... but are you still up for doing a group buy for the front xi diffs?

Thanks in advance