The Race carrier option is designed only for race and track use - it will be noisy and unrefined for street use and no warranty is offered. This is known as a 1-way limited slip and the zero lockup under braking and mid-corner coasting means very little lock-up is pushing you into understeer. Engagement is set by single-driven ramps - aggressive engagement on acceleration but none or very little on deceleration. As with any racing part, weight is the enemy and Diffsonline reduces mass by over 25%. Up to 10 clutch discs are used with preload set by coil springs instead of spring plates that are affected by wear. However, it is out-performed by traditional clutch differentials on the track and loses performance and refinement within 60,000 miles.įull Race LSD carrier - This carrier is a wish list come true for differential features. When new and fresh the system works quite well for street use. The BMW M Variable viscous diff uses plates and heavy fluid to transfer torque between axles. Our clutch options are generally not for street use except in highly-modified cars that need the extra traction. Lower values equal a more aggressive lock-up. Custom ramp angles are machined into the carrier to dictate lockup behavior under acceleration and deceleration (coast).
These diffs feature multiple clutch and spring discs - more clutches equal greater capacity for torque and heat management. Our clutch options are designed around serious track or race use since they can be easily customized around car setup and driving style. Some street 2 and 3-disc street clutch options have been discontinued due to the dwindling supply of original BMW cores. The only downside is potentially higher gear whine (but not in all cases). Lock-up is quicker and smoother and it's less affected by heat than a clutch. Torque transfer happens instantly and it doesn't need to sense a spinning wheel first. Helical diffs offer advantages in wear resistance and performance over traditional clutches. For purely street use we would recommend a helical such as Wavetrac or the in-house Diffsonline carrier. There are a number of limited-slip carrier upgrades for the E46 M3 but they fall into two groups - clutch and helical.
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