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Old 09-03-2011, 05:05 PM
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CHVYKLR CHVYKLR is offline
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Join Date: Dec 2009
Location: Jax, FL
Posts: 2,364
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Vehicle: 2009 Ram Crew 2WD
Trim Level: Lone Star
Color: Black
Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
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high c/r engines with forced induction is pretty normal these days. with all the advancements in PCM processors, high pressure (50+ psi) fuel systems, piezio injectors, factory installed knock sensors and some vehicles O2 sensors are also wideband vs the less accurate narrow band. all this tech allows PCMs to monitor and make split second a/f changes to prevent detonation.

if the EB can run 14 psi on 87 octane then running 18 psi on a 93 octane tune would be no sweat. you def add fuel when you add boost to keep the a/f in check but where the F/I engines are seeing their good mileage is when they are being operated in vacuum. If the EB has a vacuum/boost guage installed the driver can easily manipulate this condition with throttle position and since the motor has a high c/r (10.5:1) it still responds well when not using boost. a lower c/r (like 8.5:1) would be more sluggish when not being boosted.
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