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Zetec Engine
SPI Engine

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Zetec Engine Hacks

Name Description
Underdrive Pulley InstallationThe Underdrive Pulley, or UDP, uses high-school physics to reduce your accessories' drag on your engine, therefore allowing more power to the wheels.
Adjustable Cam GearsNote: These instructions help with a Timing Belt installation. Installing a pair of manually adjustable cam gears will allow you to fine tune the valve timing. When used properly, the fuel economy, torque, and horsepower curves can be manipulated to the driver's needs. Note: Expensive Equipment (a Chassis or Hub Dyno) is needed for proper tuning of adjustable cam gears after installation.
Cat-Back Exhaust System InstallationI'm writing this Cat Back install up AFTER doing one myself and making quite a mess. This is not how I did it, but it's how I'm going to do the next ones!
Camshafts - Removal/InstallationInstalling a set of aftermarket camshafts can improve your engine's performance by opening your engines valves farther, keeping them open longer.
Porting the stock Throttle BodyHow to bore out your stock TB for imporved throttle response.
Zetec Stumble Fix On a lot of Foci, the DPFE and EGR act sort of strange when cruising, and can give the feel of throttle "flutter" or like you're driving into gusty winds when you are not. Here's a highly unofficial Fix from!