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91 Civic Si
233 Posts
I dunno if they'll go up(leaners meaner, remember?) but it will for sure be safer. Should be around 11.9 or 12:1 ...13.:1 is what NA motors should be tuned at man. Not bad power for 11lbs though. Definitely go back for a retune soon though. Remind your tuner that it's a boosted car and not an NA car lol. Keep us updated.
Leaner is not always meaner. Fuel and air do not stay mixed very well under higher pressures. In order to make sure every possible molecule of fuel that could get burned, compared to the quantity of air in the chamber, does get burned, it is generally necessary to run more than the perfect amount of fuel.
How much more fuel depends on the particular engine. Beyond that, most people add even more fuel to keep temperatures down since extra fuel with nothing to react with actually works as a fire extinquisher.

Fully understanding that ^^^^^ 1st, it is generally thought that the majority of NA engines will make best power between 13 and 13.5 A/F and still survive well. Most forced inducted engines do better in the 12:1 range since the pressures and temps are higher.

But a theoretically perfect engine would make the best power and survive well closer to 14.7:1.
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