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Let me make sure I'm understanding all of this correctly. E fuel does not contain the same amount of energy as gasoline, but has a higher octane and doesn't knock as easily as typical pump gas. For NA motors either fuel will work, even straight E85 will work because the stock pump/injectors can supply enough E fuel for the proper air/fuel mixture. However, when going with forced induction, the factory fuel pump/injectors cannot supply enough E fuel to match the added air being pushed into the cylinders. On lower boost FI engines, LT4 fueling can supply enough E85 fuel to make a proper air/fuel ratio, as boost goes up, you may need to lower your E% to something like ~E60 for a proper air/fuel mixture. E fuel runs cooler due to having more liquid volume in the cylinder than gasoline, and its higher octane actually burns slower and more controlled than lower octane gasoline.
If instead of E you're running 93 octane gasoline, your factory LT1 fuel system can supply enough fuel for a proper air/fuel mixture to maybe 7-8psi boost with a proper tune, although you might have to sacrifice some HP via less timing to prevent knock. High octane race fuel might allow you to reach E fuel HP numbers with the factory LT1 fuel system.
89 octane pump gas and 110 octane race fuel contain the same amount of energy. The benefit of race fuel is its slower more controlled burn, and its ability to resist knock. It has no more punch than pump 89. A cup of 89 and cup of 110 race fuel contain the same amount energy, with both having more energy than a cup of E85, or E% anything for that matter.
Does most of this sound correct ?
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