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Unorthodox Racing Ultra Street Sets build upon the success of the Ultra Street crank pulleys by adding Ultra Accessory pulleys. Like the Ultra Street pulleys, Ultra Street Sets are light weight 6061-T6 aluminum billet. Premium 6061-T6 aluminum billet en sures the consistency of the material's strength and balance. Tolerances for each crank and accessory pulley are held to within .001". In addition to the numerous machining steps taken to ensure the crank pulley is the lightest possible design, each accessory pulley is also lighter than the factory piece it replaces and includes lightening holes where possible. < p>Unorthodox Racing pulley sets on average can provide gains of 8 to 15 HP and 6 to 10 lbs.-ft. on normally aspirated engines and 10 to 18 HP and 10 to 20 lbs.-ft. on forced in duc tion engines. Higher gains can be realized on vehicles that are modified. These gains are obtained in two ways. First, and most important, is the weight loss. There is an average of 2.7 HP gained from every pound lost off the crank shaft. With the lighter accessory pulleys, as much as 15% to 30% more power can be found. 85% of our gains are from weight loss. The rest of the gains are from underdriving, which accounts for about 15% of the total gains. Unorthodox Racing does not push underdriving more than 20% for two important reasons. The main reason is to keep charging systems, air conditioning, ower steering, and water pumps moving fast enough for every day driving. Second, not much horsepower is gained from extreme underdriving.All underdriving is done with the crank pulley, not the accessory pulleys (most applications). This is done so maximum weight loss can be achieved at the crank where most of the horsepower gains are found. The accessory pulleys for most applications are stock diameter. Since the Ultra Accessory pulleys are the same diameter as the stock units, you may install an Ultra Street crank pulley as a first step. Then, at a later date, you may purchase the accessories and install them without having to change belts again (on most models).For certain applications underdriving ratios are modified with the accessory pulleys when underdriving is not feasible with the crank pulley. In these cases accessories and crank pulleys are only available as a set and are not available individually. Unorthodox Racing Ultra Street Set pulleys cover a vast array of applications and are available in natural polished aluminum as well as black, red, and blue anodizing. - Real HP & torque gains across entire RPM range
- One of the highest HP/Torque per dollar gains on the market
- The broadest range of applications available
- Over 8 years of use in "real world" applications from street to strip to rally to road course
- Better than OEM belt fitment & alignment
- Accessory pulleys available seperately for many applications
- CAD designed & CNC'd from 6061 Aluminum billet
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