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Old 07-30-2012, 11:33 PM   #11 (permalink)
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Join Date: May 2011
Location: Indiana
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White Whale - '07 Dodge Ram 2500 ST Quad Cab 2wd, short bed
Team Cummins
90 day: 37.68 mpg (US)
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Originally Posted by ron View Post
I dont know if this translates to Diesel but Ill add it. I installed a ram air intake on my 2003 toyota techoma the first drive I gained 4mpg from 21 to 25 at 65mph the next time the confuser had detected the lean condition and adjusted the fuel ratio.NOTE now when I drive at 35 mph the ram air will hold the speed at 35 with no throttle, nice for in town.
This study by Oak Ridge National Labs found that fuel economy for fuel-injected gasoline cars was basically unaffected by intake restriction:

They were more focused on plugged air filters, but I think the pressure effects of ram air is basically the same thing in reverse.

The results make sense to me: less intake restriction and your throttle will just be further closed. Therefore the TOTAL restriction (from outside the vehicle to intake manifold) remains the same. Diesels are a different story however.

Diesel Dave

My version of energy storage is called "momentum".
My version of regenerative braking is called "bump starting".

1 Year Avg (Every Mile Traveled) = 47.8 mpg

BEST TANK: 2,009.6 mi on 35 gal (57.42 mpg):

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