PRV Performance
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_ Test loop

City

Highway

Highway

Air Care Colorado

_ Speed

Variable

65 mph

65 mph

City

_ Conventional Manifold

38 mpg2

43 mpg3

43 mpg3

32.1 mpg6

_ PRV Manifold

42 mpg2

53 mpg4

58 mpg5

36.0 mpg6

_ Percent Improvement

11%

23%

35%

12%

_ Notes

1.    No mechanical changes between tests other than the induction system and associated fuel map. Highway tests conducted on a closed-circuit test loop between Denver, CO and Brush, CO at 65 mph -- the same test used since June 2007. Honda D15B engine and low rolling resistance Sumitomo tires.

2.    Average of seven 204-mile test loops. Throttle control improvement is expected to increase fuel economy and future designs.

3.    Air/fuel ratio is stoichiometric, closed-loop control O2 sensor feedback control using a stock P08 electronic control unit. Test repeated three times with a range of 42 to 44 miles per gallon in ideal fair weather conditions with light wind.

4.    Air/fuel ratio is stoichiometric, closed-loop control O2 sensor feedback control using a AEM electronic control unit.

5.    Air/fuel ratio is 16.8, closed-loop control O2 sensor feedback control using a AEM electronic control unit.

6.    Calculations are based on Environmental Protection Agency, 40 U.S.C. § 600 using results from State of Colorado tail pipe analysis.



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