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turbo noise
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  1. Focus ST Turbo Upgrades
    Hi all, this is my first post but I have lurked here for a while. I bought a 2014 Focus ST with pretty much every performance modification that you can do to the car without going the built motor route. Big turbo (unsure on it, 2867r or 2971r most likely), intake, downpipe, full exhaust. The...
  2. Focus ST Discussions
    Hi, all. I have a couple interesting issues here that I'm not sure how to resolve. I am running the Cobb Stage 2, 93 octane map on my 2018 Focus ST. 1) While holding the gas at an even position (cruising on the interstate at 65-70, 2800-3000 RPM), and when turbo PSI is at or around 1.00-2.00...
  3. Focus ST Discussions
    Hey all, So I have a green air filter in my 18' ST1, love the flutter and conservative(ish) bypass valve sounds on liftoff and change. For a while, I tried running with the airbox off, love all of those liftoff noises with the box off but the constant sucking intake noise from inside the cabin...
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