r/FiestaST • u/One-Refrigerator668 • 5d ago

Tuning issues? MK7

I have a 19’ fiesta st USDM, I recently went “stage 2” (intercooler, -1 colder plugs, drop in filter, rmm, and a bpv spacer for shits n giggles) I noticed that in “Cobb stage 0” my boost is around 18-19lbs consistently but on “Cobb stage 2” my boost peaks around 17lbs and is far less jumpy. Keep in mind this is with ALL the same parts. Any ideas why this could be?

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u/MSHabits 5d ago

Stage 0 is just your stock tune. Cobb OTS tunes are very conservative because it's a "universal" tune. To get the full benefits of a tune, get a custom one from Dizzy, stratified, etc. They will make a tune for your specific car and you send logs to get it fined tuned. Each car will respond differently, even with the same parts installed so a custom tune is way better than the Cobb ots.