Quote:
Originally Posted by Eldi Z
What if only 93 pump @ ~ 8 PSI boost with an LT4 blower is in the plans on a stock LT1 / SBE ?
Will 560-580 WHP running full LT4 fueling (Injectors, HPFP, LPFP) be safe and reliable for a streetable DD, long-term?
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Correct we have built many this way as a entry level supercharger upgrade, the LT4 fuel system is KEY!
Quote:
Originally Posted by White1SS
From what I've seen from the top builders/tuners on the site, 580+whp should be no problem and trouble free at ~8psi on 93 with LT4 fueling and tune.
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Correct!
Quote:
Originally Posted by White1SS
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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If you have E-85 readily available around you it is your best option for engine protection as well as the added benefit of more power.
Keep in mind always; You need about 30% more fuel by volume for E-85 vs Gasoline so it puts a lot more demand on the fuel system and you will reach the limits of the fuel system pretty fast with FI.
I was corrected on this a while ago, Race Gas and Pump gas do not have the same amount of available energy content, but close.
Diesel, jet fuel, then 87 are the 3 highest from what I can find.
https://www.appropedia.org/Energy_content_of_fuels