I wrote: > So, increasing the volume of air the intake tract can flow will have no > affect on power or fuel economy (in a stock unmodified engine). > > If you drive your van at less than redline, increasing the size of the > throttle body and/or increasing the size of the intake tract will have no > affect > on performance. Certainly everyday city driving is far below redline, > well > within the capacity of the stock AFM and air filter. Even if the stock > system is > restrictive, there should be lots of headroom for normal driving with a > stock engine. reply: So I've done some research and have come to the conclusion that I was incorrect in the above. I learned a bit about air mass, volumetric efficiency and other factors. For example, for the porsche 911 you can get a kit which replaces the bosch flapper door afm with a hot wire version. A friend told me this seems to be a popular conversion. http://www.autothority.com/mass_flow.htm You learn something every day. Gary Lee |
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