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Old 08-12-2016, 08:01 PM   #53 (permalink)
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Location: Indiana
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RCs XJ - '87 Jeep Cherokee

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Originally Posted by oil pan 4 View Post
A supercharger is not going to increase fuel economy on a gasoline engine.
Man, not to be a naysayer, but yes it does in most cases. It's been well documented. They've been used extensively in the RV aftermarket for years for just that reason. Have a 100ft lbs more off idle has proven results. Essentially you are artificially increasing compression.

Just like building an engine, selecting a supercharger is all about what you want. Roots style blowers are perfect for trucks and usually add fuel efficiency. Again, not dramatic, but at 7mpg, a bump of 2 would be huge.

The downside is you'd really need to run premium.

As far as the cost/benefit... if you are buying used, and install it yourself your return on invest might be relatively short depending on miles per year. If you wanted to buy new, have it installed and drive it 1000 miles per year, yeah it'd be a horrible investment.

Last edited by RCB; 08-12-2016 at 08:11 PM..
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