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Old 11-04-2012, 12:53 PM   #12 (permalink)
bestclimb
Smeghead
 
Join Date: Oct 2009
Location: South Central AK
Posts: 933

escort - '99 ford escort sport
90 day: 42.38 mpg (US)

scoobaru - '02 Subaru Forester s
90 day: 28.65 mpg (US)
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The throttle plate restricts air at the TB. If you fit a smaller TB you will have more restriction there so you will open the throttle a little more for the same power. This will result in the same amount of air going in so the computer will send in the same amount of fuel.

The biggest change you may note is that it takes more "foot" so you will have to make your self push harder to go as fast as you did before. You may see an increase in mileage but it will be more of a driver behavior thing than from any magic happening at the throttle body.

A similar effect could be gotten by putting a heavier spring on the linkage.
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