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Instruction Sheets for Part Number GFS-2014
Go Fast Bits Lightweight Underdrive Pulley Kits for 2015-2020 WRX STI, WRX, 2008-2014 IMPREZA - 2014
Part Number: GFS-2014
Go Fast Bits Lightweight Underdrive Pulley Kits
Pulley Kits, 3 Piece, Underdrive, Crank, Alternator, Power Steering Pulley, WRX/STi 2008-20, Liberty GT 2003-12, Forester XT 2009-12, Kit
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Estimated Ship Date: Nov 20, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
2014
Part Type:
Product Line:
Summit Racing Part Number:
GFS-2014
Item Number:
6936952
UPC:
9328022002415
Pulley Style:
Serpentine
Pulley Set Style:
Performance ratio
Pulley Material:
Aluminum
Pulley Finish:
Black
Water Pump Pulley Included:
No
Water Pump Nose Cone Included:
No
Crankshaft Pulley Included:
Yes
Crankshaft Pulley Grooves:
6-groove, serpentine
Crankshaft Nose Cover Included:
No
Power Steering Pulley Included:
Yes
Power Steering Pulley Grooves:
6-groove, serpentine
Power Steering Brackets Included:
No
Alternator Pulley Included:
Yes
Alternator Pulley Grooves:
6-groove, serpentine
Alternator Fan Included:
No
Alternator Nose Cover Included:
No
Alternator Brackets Included:
No
Air Conditioning Pulley Included:
No
Air Conditioning Cover Included:
No
Air Conditioning Bracket Included:
No
Idler/Tensioner Included:
No
Idler Cover Included:
No
Idler Brackets Included:
No
Belt Included:
Yes
Hardware Included:
No
Quantity:
Sold as a kit.
Notes:
Fits all models of EJ engine where the A/C has a stretch fit belt rather than using a tensioner.
Go Fast Bits Lightweight Underdrive Pulley Kits
Go Fast Bits lightweight underdrive pulley kits are made from aircraft-grade 6061 T-6 aluminum, anodized black for a stealthy appearance with superior wear resistance, and lightened to offer faster acceleration through significant weight reduction. GFB pulley kits are designed to improve acceleration by reducing the rotational mass (inertia) on the crankshaft as well as parasitic loads from the driven accessories. The effect is similar to a lighter flywheel, and the engine feels livelier and more willing to rev.
Concerned about possible adverse effects of lightweight pulleys and underdriving? Rest assured GFB has done their homework. The underdrive ratios have been optimized to ensure there are no adverse effects on the performance of the accessories, and while it is true that some engine types do suffer harmonic issues from lightweight pulleys, GFB steers clear of those. Go Fast Bits kits are thoroughly application tested and do not cause engine damage in the short or long term.
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Instructions & Calculators
Some parts are not legal for use in California or other states with similar laws / regulations
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