What a Lightweight Crank Pulley Does
A billet aluminum crank pulley reduces rotational mass compared to the factory harmonic pulley. That can result in:
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Quicker throttle response
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Faster revving feel
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Slight drivetrain efficiency improvement
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Reduced parasitic drag
It’s not a 30HP mod. It’s a refinement mod.
VMS RACING Crank Pulley is the nicest looking and best performing pulley anywhere at ANY price!!! It is the only OEM size light weight crankshaft pulley on the market. It has a Unique and exclusive gun metal matte finish.
Why OEM Size Matters
Unlike underdrive pulleys, OEM-size pulleys:
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Maintain proper alternator output
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Keep power steering performance consistent
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Preserve cooling system efficiency
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Avoid charging or idle issues
You get responsiveness without side effects.
This is a lightweight 6061-T6 billet aluminum CNC machined crankshaft pulley with tolerances kept down to .001, which are usually reserved for aircraft and military designs. This pulley has BETTER THAN OEM belt fitment and alignment providing real-world gains in HORSEPOWER, TORQUE and FUEL ECONOMY.
Also Compatible With 4G63 (Select Applications)
Certain versions are also available for Mitsubishi 4G63 platforms (verify application before purchase).
⚠️ Always confirm engine compatibility and year before ordering.
This VMS Racing Crank Pulley is perfect for your daily-driver street or strip car. The lighter weight will increase horsepower and torque by reducing the weight of the rotating assembly, WITHOUT the problems associated with underdrive pulleys! Underdrive pulleys create a MULTITUDE of problems, beginning with discharged batteries and overheating. By “underdriving” (making them rotate slower) the engine-driven accessories, you lose the capacity of the water pump and of the alternator to work at the levels the manufacturer intended them to work. This creates overheating and charging problems.
YOU WILL NOT HAVE THESE ISSUES WITH THIS PULLEY as this pulley is the SAME SIZE as the OEM pulley, so all the accessories move and operate EXACTLY LIKE the manufacturer intended them to. The other issue you will avoid is changing the size of the belts.
You can use the SAME SIZE STOCK BELTS that came on your vehicle from the showroom floor. There is NO NEED to buy new belts. Whenever they break or wear down from use, simply go to your nearest auto part store and buy the same factory size for your original engine. This is an EXCELLENT UPGRADE for your vehicle to increase HORSEPOWER, TORQUE and FUEL ECONOMY. SIMPLY a NO-BRAINER.
Key Features
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CNC-machined billet aluminum
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Lightweight design
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OEM size (factory diameter)
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Uses stock belts
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Direct bolt-on replacement
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Precision-balanced construction
Translation: easier revs, zero belt drama.
Installation Notes
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Use proper crank bolt torque spec
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Consider replacing crank bolt if recommended
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Verify belt condition during install
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Check alignment before startup
Because crank pulleys aren’t something you “tighten by feel.”
Final Verdict
The VMS Racing Lightweight Billet Crank Pulley (OEM Size) for the 05–06 RSX Type-S offers improved throttle response and reduced rotational mass while retaining factory belt compatibility.
Because sometimes the smart upgrade is the subtle one.


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