Quote:
Originally Posted by Kingtal0n
Did you not read: "modern EFI engine" a 1985 is not a modern EFI engine. V8's from pre-95 era tend to be sloppy and have reduced fuel economy and increased emmisions because of it. once you hit 1995+ especially 1998 era things got much better for V8's.
A 1998 LSx engine in a Miata should do 30+ mpg easily.
And weights are subjective. most 240sx start around 3000lbs, usually less. Sometimes as low as 2600lbs. A 2j only adds a hundred or two or three to that, usually 3200lbs or less is the final weight.
But we can gut and tube it to get it lower.
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No I did read but you also said engine size doesnt have much to do with fuel economy its simple more cyclinders/bigger displacement will use more fuel even at idle with no mass being moved through drivetrain. Now comparing a 6.0 vortec to a old 2jz is dumb you're talking 2 different engines from different times. N2m most people who go to a v8/lsx swap have a tendancy to strip it of ANY economy related componants even such the ecu is retuned so how can it give more mpg after all that than the vehicle rated mpg it came from?
Now if you slap it in miata vs a vette I can understand a bit of a mpg gain but not to where people should be thinking " well if I ls1 my miata I'll get better mpg's than a 2jz in my 240sx cause it's lighter..