Quote:
Originally Posted by ron
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.
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This study by Oak Ridge National Labs found that fuel economy for fuel-injected gasoline cars was basically unaffected by intake restriction:
http://ecomodder.com/forum/showthrea...omy-22633.html
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.