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Natural aspiration, or EFI???

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JT Ranch
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Natural aspiration, or EFI???

Post by JT Ranch » August 28th, 2019, 11:29 am

If I build a 1991 - 1998 4.0 with a 1979 4.2 crankshaft, would EFI be the best route for more power, or nat. asp.?

Also, I'm in California, the dreaded emissions state, and, I've heard that I have a better chance of passing emissions testing with EFI.

Thank you in advance for your thoughts!

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SkylinesSuck
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Re: Natural aspiration, or EFI???

Post by SkylinesSuck » August 28th, 2019, 1:35 pm

Naturally aspirated means no forced induction i.e. supercharger or turbocharger. EFI is electronic fuel injection.

I think you are asking EFI vs. carb, and while both can work and pass emissions just fine, EFI (especially with tuning) would have an advantage, along with drivability.

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Cheromaniac
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Re: Natural aspiration, or EFI???

Post by Cheromaniac » August 29th, 2019, 9:12 am

EFI wins hands down for drivability under all conditions, more power, better fuel economy, and lower exhaust emissions.
In your case the choice between EFI & carb is a no brainer.
1992 XJ 4.6 Stroker - 5MT - Sold :cry: Stroker build-up, Stroker "recipes"
2006 Mustang GT - 5MT - Midlife crisis car :D with Mods

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