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Our helical front LSD is unlike any other modification for AWD cars. It affects nearly every aspect of the driving experience.
Acceleration - you’ll get off the line faster. Much faster. We found 60’ times on our test car on the street went from mid 1.6s to mid to low 1.5s. The LSD lets your front wheels do much more of the work off the line.
Steering - the LSD ties your front wheels together better, even when there is full traction. You’ll feel a noticeable increase in steering response and precision.
Cornering - your car will carve a much tighter line in the corners. Understeer will be drastically reduced, especially under throttle. You will have to relearn the limits of your car; they will be noticeably higher.
Braking - your car will be much more controlled under braking. The LSD works both directions, so it works to keep one wheel from locking up and tripping ABS.
Drivability - the LSD does not create any additional NVH. It is purely gear-based. It creates no noise or strange handling characteristics. It’s a 100% OEM+ kind of mod. It just does everything better.
Durability - the LSD has no clutch packs to wear out. There are no wear items. Enjoy a maintenance-free experience.
Strength - the LSD’s most common application outside of AWD cars is 600+ WHP FWD drag cars. It will never be the weakest link in the system.
Peak Load Reduction- the LSD keeps substantially more torque going to the underused front end off the line, keeping all that torque away from the overloaded rear end. That means less load on the driveshaft, rear diff, and rear axles, the common weak links on high-powered AWD cars.
Check out this video from our B8 S4 autocross race car taking full advantage of the diff. Some things to look for that weren’t possible before the diff:
The launch. This was a particularly slow 60’ for that day at a 1.574. We hit 1.526, 1.521, 1.518, and 1.509 that day. Manual transmission with no launch control.
From 0:26 to 0:31 is a long turning acceleration zone. The car stays composed and does not understeer, allowing full throttle application through multiple elements.
The very tight turn and acceleration to the finish at 0:33. Notice how early throttle application is at corner exit.
The LSD is a helical gear style differential. There are tons of YouTube videos showing their operation. The result is very simple to understand.
Under equal traction conditions, both wheels spin the same speed. While turning, the wheels are allowed to spin whatever speed they need to without binding.
As one wheel loses traction, the gears inside the LSD engage progressively, sending more and more torque to the wheel with more traction. This limits torque sent to a low traction wheel while increasing that sent to the high-traction wheel, resulting in drastically less wheel spin.
If a wheel gets near to a zero-traction situation (wheel spin is about to occur), the LSD becomes fully locked, stopping the low traction wheel from spinning faster than the high traction wheel. This means a high amount of torque is delivered to the front end, even under wheel spin, resulting in higher front traction.
Just like the front LSD, the OEM center differential vectors torque to where there is more available traction. With the newfound front traction, less torque will be sent to the fragile and often overloaded rear end. This is especially important during a launch, where the open OEM front differential delivers zero torque under wheel spin, sending maximum torque to the rear end.
What you do:
Lower transmission
Unbolt front diff from the passenger side
Send differential to us (weighs 20 lbs and fits in 12x12x12 box)
We send it back with the new differential mounted
Install in trans, measure and set backlash using shims between the new diff and the ring gear
Reinstall transmission
What we do:
Take precise measurements of OEM ring gear position
Remove side bearings to facilitate mounting to CNC mill
Machine the ring gear off, perfectly flatten the back of the gear, and drill/tap 16 mounting holes
Mount ring gear on LSD, remeasure position of ring gear, and shim to match factory position
Press on new side bearings
The following video goes over everything you need to do from the time your transmission is out of the car to sending it in. Towards the end of the video is the first secret code you’ll need in order to place your order. There’s really important stuff in here that will save your irreplaceable diff from getting damaged.
The next video contains the 2nd secret code needed to order and goes over how to properly reassemble your upgraded differential. Failure to set proper backlash may result in premature failure of your irreplaceable ring gear.
What’s Included
Helical LSD
Machine work to adapt factory ring gear to LSD
16 ARP 8740 Chrome Moly bolts to attach ring gear to LSD
New inner and outer side bearings
New outer axle seal
Shim pack to adjust backlash
Return shipping
What’s not Included
Shipping to us
Gear oil to refill transmission after install
DIF01A0 - 0B4 6MT
DIF01A1 - 0B5 DSG (same LSD housing as 0B4 but different bearings and shim pack)
DIF02A0 - 0B6/0BK ZF6/ZF8
DIF03A0 - 0B2 6MT
