Get advice from our specialists to make sure you’re choosing the right part for your vehicle and setup.
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Get advice from our specialists to make sure you’re choosing the right part for your vehicle and setup.
The Wavetrac BMW E46 E90 188K LSD is a helical limited slip differential for the BMW 188K axle with final drive ratio over 3.15: E46 325i, 328i and 330i auto 1998-2005 (bolt-on ring gear); E9X 325i, 328i and 330i 2006 on; E9X 335i auto from 9/2007; E8X 135i auto 2008 on; E8X 128i 2008 on; E60 525i, 528i and 530i auto; Z4 2.5i and 3.0i.
Wavetrac part number: 30.309.175WK
Fits: BMW 188K axle with final drive ratio over 3.15: E46 325i, 328i and 330i auto 1998-2005 (bolt-on ring gear); E9X 325i, 328i and 330i 2006 on; E9X 335i auto from 9/2007; E8X 135i auto 2008 on; E8X 128i 2008 on; E60 525i, 528i and 530i auto; Z4 2.5i and 3.0i.
Installation notes: On the E9X, E8X, E60 and Z4 applications some ring gears may be welded. All welded OEM gear assemblies require machine work. Installation kits are sold separately.
Wavetrac designed this differential from a clean sheet, so it brings current gear technology to the market. Internally, the gear tooth forms give more strength and better oil film retention than competitive designs. The gear package is also smaller, which reduces overall mass yet makes it more durable. In addition, Wavetrac put as much material as possible at the side gear and axle interface, because this area matters most when power levels get high.
The Wavetrac BMW E46 E90 188K unit uses patented technology that mitigates wheelspin when an unloaded wheel condition arises. In fact, it is the only torque-biasing differential on the market that does this. During zero axle load conditions, the Wavetrac cam device acts to create internal load. As a result, it maintains drive on the gripping wheel instead of acting like an open diff and going nowhere.
Wavetrac crafts each differential from the highest quality materials available. The internal gears use high-strength 9310 alloy steel, and the diff bodies come from case-hardened steel billet. To complete the package, every Wavetrac differential uses high-strength fasteners from ARP, the world leader in fasteners. Finally, all Wavetrac differentials include a transferable limited lifetime warranty.
The Wavetrac BMW E46 E90 188K LSD is a special order item, so please enquire for pricing and lead time. We can check the fitment against your VIN or rego number, and we can also fit the unit for you in our Christchurch workshop. Lead times vary by unit, so we quote each order fresh and confirm the delivery date with you before we order. Please note that special order parts may not be returnable.
