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View Full Version : Best A/F ratio for 04+ N/A 5.4 Engine

FILE
10-09-2007, 06:53 PM
Where do these engines safely make the most HP for a N/A application on 93 octane?
tarinitup
10-09-2007, 07:25 PM
12.8 -13.0
one92rs
10-14-2007, 01:08 PM
12.0 to 12.5 is the best for the new three valve engines. this is according to the tuners that are tuning them. mine is at 12.3 and it runs great.
dirt track racer 81
10-14-2007, 01:27 PM
the ones i tuned i set them at 12.5
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