• E9X M3 Rogue Engineering Underdrive Pulley

    E90 / E92 / E93 M3
    SKU : E9X-M3-REUDP


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As most know, the heart of every BMW is its engine. When you blip the throttle to ask for power, the engine responds with the power that BMW designed into it. Well, almost all of the power. The engine is also asked to drive specific accessories in the vehicle such as the A/C compressor, alternator, power steering pump and water pump. All of these crank pulley driven accessories inherently affect the engine's efficiency.

Rogue Engineering has developed a power pulley kit that reduces the drag on specific pulleys while allowing others to remain at their same efficiency. This allows for perfect operation in daily driven vehicles without a hiccup or stutter. However, when the demand of power is requested, the power pulley kit allows for the freed power to become apparent. The term "power" pulley is a bit of a misnomer. Underdrive pulleys actually free up power by reducing the drag caused by the accessories. Our pulleys are based off a calculated percentage from factory dimensions, so that particular component speeds are safely reduced without affecting their true purpose.

Rogue Engineering Power Pullies are CNC machined from 6061-T6, heat treated aluminum and specially coated with a MIL-A-8625 Type III hardcoat anodize finish. This kind of anodizing is not to be confused with a Type II cosmetic anodize finish (typical colors such as red, blue, silver, green, etc.). The hardcoat anodize finish actually builds a small surface layer on top of the aluminum, preventing wear.

Until now, MIL-A-8625 Type III hardcoat anodize was not available in a deep, rich, black color. By working with our anodizing vendors, we have been able to implement a hardcoat anodize finish that we are proud to phase into our product line. This unique gloss, jet black anodize finish is unlike the "dark greyish-brown" of other dark hardcoat finishes. This unique finish is now standard on all Rogue Engineering pulleys.

Its all in the R&D Rogue Engineering is proud of its motorsport association with its racing team partner ships which allow us to offer products used in professional racing. This association allows us to offer the BMW enthusiast the same parts being used in motorsport endurance racing. For example, our E46 M3 RACE pulley kit is a direct result of our involvement with Automatic Racing since 2005. Similar associations with Bimmerworld Racing continue to allow Rogue Engineering to develop parts that work in racing environments, not just bullet points on an internet based website.
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