• 15% OD = +3psi boost increase (gains in the 17-20psi range may be limited by throttle body size)
    • Equivalent to a 9mm (3/8") smaller upper pulley
    • Time Required: 3 hours (approximately)

    • Skill Level: Expert - It's not recommended that you attempt this installation unless you're an experienced Technician.

    • Tune Required - A custom tune file is required for use with this product.

    • Mustang 2011-2017 Boss 302

    • Mustang 2011-2017 GT

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Now available exclusively from VMP, 15% OD crank pulleys for TVS supercharged Coyotes. Requires a low profile accessory belt tensioner be used for clearance, this tensioner is available from VMP.

We designed this larger balancer solution to get more power from Roush 2.3L TVS and VMP TVS Gen2 superchargers. With the right parts its possible to make 800-900rwhp from a 2.3L on a 5.0L Coyote or Roadrunner.

VMP's 15% overdrive 8-rib "AC pulley" for the ATI balancer (fits ATI PN: 918047 or 918047N). It's referred to as the AC pulley because it normally drives only the AC compressor, but on VMP, Roush, and Whipple 2.3L supercharged Coyotes it also drives the supercharger. This was done to load the crank shaft as close to the front main bearing as possible and make the SC belt as short as possible.

Works with both 6 and 8 rib systems (6-rib belt uses middle six ribs).

As part of VMP's 8-rib conversion system for the Coyote, we've designed an overdrive pulley that bolts in place of the "AC pulley" on the ATI balancer. These positive displacement supercharger systems use the rear shiv for best possible crank loading, a 15% OD is the largest size possible due to the first shiv tensioner on the front cover.

Recommended belt is a K080825 for 8-rib or K080825 for 6-rib with smaller 69-72 pulleys.

Recommended belt is a K080830 for 8-rib or K080832 for 6-rib with larger 75-85 pulleys.

Full 8-rib conversion recommended when running over 16psi.

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