Go Fast Bits Underdrive Pulley Kit Subaru WRX 08-2014 / STI 08-2021 – Import Image Racing
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Go Fast Bits Underdrive Pulley Kit Subaru WRX 2008-2014 / STI 2008-2021

Go Fast Bits Underdrive Pulley Kit Subaru WRX 2008-2014 / STI 2008-2021

Rated 3.0 out of 5
Based on 1 review
SKU: gfb2014
Availability: 33 In Stock
Product Type: Engine Pulleys
$273.75
$365.00
$273.75
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This GFB Pulley Kit comes with the crank, alternator and power steering pulleys as well as the belt needed for install. Having large heavy pulleys spinning takes away power that is better spent moving the car. This kit takes care of that by replacing the crank pulley with a lighter version that underdrives the power steering and alternator yet leaves the A/C compressor spinning at normal speeds.

Part #: 2014

Stock Crank Pulley : 5.51lb (STI) / 4.63lb (WRX)
GFB Crank Pulley : .86lb

Stock Power Steering Pulley : .81lb
GFB Power Steering Pulley : .37lb

Stock Alternator Pulley : .36lb
GFB Alternator Pulley : .14lb

Total Mass for GFB Pulley Kit : 1.38lb
Total Mass for Stock Pulleys : 6.69lb (STI) / 5.81lb (WRX)
Mass Savings : 5.31lb (STI) / 4.43lb (WRX)

Alternator Underdrive : 16.5%
Power Steering Underdrive : 18%
A/C Underdrive : None



average rating 3.0 out of 5
Based on 1 review
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Review posted
Reviewed by Mike C., from United States
Rated 3 out of 5

Good for lower power stage 2 cars

Thought this would be a nice add on to my high hp build until talking to my tuner. Due to the fact that any light weight crank pulley have no way to balance the harmonics of the engine it can cause excessive wear on internal engine components causing premature failure= not good... it's not all bad though definitely going to be reusing power steering and alternator pullies along with a 1 size smaller belt with a new fluid damper harmonic balancer

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