BSFC - are the factors still relevant for modern hardware?

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05-19-2022, 07:19 PM

RunninOnEmpty

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BSFC - are the factors still relevant for modern hardware?

Using online Fuel Injector Calculators, a lot of them ask for the power adder to determine the Brake Specific Fuel Consumption like:

.45 to .50 for N/A Engines
.55 to .60 for Supercharged engines
.60 to .65 for Turbocharged engines

Just curious if these values are pulled from a book from the 1960s, or if they still apply to more modern turbo technology. I also don’t understand why the Turbo has a larger number than SCs indicating it’s less efficient. Is it strictly be definition, because the Turbocharger relies on exhaust?

Please talk to me like a 8 year-old. Sock puppets encouraged.

05-19-2022, 07:33 PM

codrus

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Engines with boost are usually run richer than naturally aspirated ones for safety. This doesn't hurt power very much, but it definitely results in more fuel burned per hp.

--Ian