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Buddy Club P1 3pc Lightweight Pulley Kit Scion FR-S & Subaru BRZ

Buddy Club P1 3pc Lightweight Pulley Kit Scion FR-S & Subaru BRZ

$380.00
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SKU:
BC05-P1PKZN6
UPC:
BC05-P1PKZN6
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Description

Factory Pulley: Alternator = 0.44lbs, Crank = 4.85lbs, Water Pump = 1.32lbs.
Buddy Club Pulley: Alternator = 0.22lbs, Crank = 0.88lbs, Water Pump = 0.88lbs. 

Factory belt can be reused. 
Note-1: It is recommended to replace with a new 6PK2070 belt as factory belt can potentially cause noise. 
Note-2: This pulley kit is designed and intended for motorsport applications. Running the air conditioner and headlights at idle can cause an insuffieient battery charge. 

The P-1 Racing Super Lightweight Pulley Kit dramatically improves engine response and performance throughout the entire RPM range 

The kit features an optimized alternator pulley to reduce drag and increase engine acceleration 

The pulleys are made of a very light, strong, high quality Duralumin material and are finished with a titanium colored Hard Anodizing 

Utilization of the crank pulley removal tool (sold separately) makes the P-1 Racing Lightweight Pulley Kit an easy install.

 

Why no Harmonic Balancer?
A better name for a harmonic balancer would be "torsional dampener" since its main task is to absorb the rotational pulses inflicted on the crankshaft by the pistons. Most often it is incorporated into the crank pulley by attaching the outer belt drive ring to the inner by means of vulcanized rubber. At the right RPM, it is possible for a resonant frequency to be set up torsionally on the crankshaft. Resonant frequency occurs when the pulses of the engine correspond with the natural frequency of the crankshaft and it ancillary components. However, since factory pulleys are often comparatively heavy (reasons for this are described later) it is actually the large mass (and therefore inertia) of the factory harmonic balancer and flywheel that will help to excite this natural frequency. So by dramatically reducing the weight and inertia of the crank pulley, the natural frequency of the crankshaft is shifted and its ability to self-excite is greatly reduced. So in fact it is the harmonic balancer's own weight that necessitates the dampening, and since the weight of a GFB crank pulley is typically about 20% of the factory component it cannot supply an exciting force significant enough to damage the crankshaft.

An opinion often expressed is "if the manufacturer put it there, it must be there for a reason". However, if you look at it from the car manufacturer's point of view, casting pulleys from steel is very cheap and easy, because they can be produced in large numbers and there is no waste (as opposed to machining them from billet). But because the resulting pulley weighs significantly more than one made from aluminium alloy, it requires dampening.

Manufacturers will always build cars (even high performance cars) to suit the widest possible selection of driving scenarios and drivers, which means there are always compromises. The weight of the flywheel and pulley also affect how fast the revs drop between gear shifts, and a production car is designed to only allow the revs to drop fast enough for average shifts. If you hurry the shift the revs will be too high for the next gear, resulting in a sharp jerk as the momentum of the engine transmits through the drivetrain. Reducing the engines' inertia with a lightweight pulley kit allows faster and smoother shifting.

When looking at high performance engines such as those found in Honda VTEC equipped cars and the S2000, it is obvious that manufacturers do understand the benefits of reducing engine inertia, and have utilized lightweight pulleys to help the power output and responsiveness without the use of a harmonic balancer.

However, this is not the case for all engines, many of them do require the use of the harmonic balancer to prevent failure. Skylines with the RB20, 25 and 26 are a good example of this, which is why we don't make a pulley kit for them. The pulley kits we do make are for engines that do not rely on the balancer to any significant degree.