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The Moditorium

A high performance automotive resource for parts, how-to's, projects, buyer's guides, technical, events, and more.

Extending the Limits of Your Stock Focus ST Turbocharger

Tech / Ford Focus ST

Extending the Limits of Your Stock Focus ST Turbocharger

By: Alan Jackson / September 23rd, 2019

Recently, I’ve had the privilege of tuning three similarly modified Focus ST’s, pretty much one right after the other, with the only real difference between them being the wastegate actuator. All three had the basic bolt-ons, though brands did vary. This alignment of the planets allowed me to get some pretty close back to back data to use in comparison of the different options for modifying the factory wastegate on the Focus ST. Car number one came in with the actuator untouched and unmodified. Car number two came in with the factory wastegate preloaded a little more than stock. Car number three came in with a Turbosmart wastegate actuator installed in place of the stock actuator. When tuning the Focus ST on the stock turbo, you are pretty much just maximizing what the wastegate can do. WGDC (wastegate duty cycle) is going to hit 100%, meaning it's working as hard as it can to keep the wastegate shut, around 4000rpm and hold there to get as much boost as the turbo can give. This may sound harsh, but that's how it works on the Focus ST. Boost pressure on the small stock turbo falls off hard towards redline dropping as low as 10psi (keep in mind I am doing this testing at over 5000ft asl).

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What You Need to Build a Focus ST Engine

Ford Focus ST

What You Need to Build a Focus ST Engine

By: JP Alonso / March 27th, 2019

When you've finally decided to do an engine build on your Focus ST or other similar EcoBoost 2.0 turbo platform, it can be a little overwhelming once you've started looking for what you need. If all you care about is finding out what you need to bring to your machinist or whoever is assembling your motor, scroll to the bottom and you shall receive. If you're interested in what all this stuff is and checking out an engine tear down, read on.

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All About Focus ST Auxiliary Fueling

Ford Focus ST

All About Focus ST Auxiliary Fueling

By: JP Alonso / April 26th, 2018

With the Focus ST specifically, the bottom line is you have to address the factory fueling limitations if you want to make around 400whp or more. There is no other way around it. Auxiliary fueling has become the best way to accomplish this and will allow for the mighty 400whp number and any point past that if you're one of the many that just can't have enough power.

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When To Build Your Focus ST EcoBoost Engine

Ford Focus ST

When To Build Your Focus ST EcoBoost Engine

By: JP Alonso / March 30th, 2018

The Focus ST is no slouch, that's for sure. It's an awesome performance platform right out of the box with a lot of potential through the aftermarket. Believe it or not, the engine can take a much harder beating than what Ford did with it. From the factory, the 2.0 liter EcoBoost 4 cylinder combined with the BorgWarner K03 "little turbo that could" cranks out 252 horsepower and 270 lb. ft of torque at the flywheel. In our own Focus ST project car, this netted us 237hp at the wheels. Our torque number suggested the Focus ST is grossly underrated because we measured 318 lb. ft. at the wheel. Regardless, it makes some good power at roughly 126hp per liter and even more torque. What about the upper limits of it's strength and durability though?

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16 of the Easiest, Cheapest, Most Effective Focus ST Mods

Ford Focus ST

16 of the Easiest, Cheapest, Most Effective Focus ST Mods

By: JP Alonso / October 4th, 2017

There is an endless amount of modding that can be done to the Focus ST. From shift knobs to bolt-on turbo kits to performance built engines, the range is limitless. As the saying goes, "to each their own", and that applies here. Whether it's function, form, power, or something else that you care about, there is something for everyone. The good news is you don't have to be rich to modify the ST and you don't need a mechanic's certification either. There are some seriously easy modifications to perform that will change your ST more than you might have thought, all at a very reasonable price tag.

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Big Turbo Upgrade - The Ultimate Focus ST Mod

Ford Focus ST

Big Turbo Upgrade - The Ultimate Focus ST Mod

By: JP Alonso / September 28th, 2017

Ever wondered if the hype is real? Here's your answer. Hell yes. Be careful though, if you take the plunge on a big turbo, prepare to never be satisfied with a stock turbo car ever again. It just won't be the same. The experience of a hard wide open throttle pull, holding 22psi, or more, all the way to 7,000 glorious rpm makes you mad that Ford gave you such a puny hair dryer of a turbo now that you know what boost can really feel like.

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