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Re: Another reason Audi doesn't go
On Fri, 13 Mar 1998, Ned Ritchie wrote:
> every input & output on the engine. The lab scopes showed a slight
> ripple in the output from the Mass Air Flow Meter and reduction of pulse
> width on the fuel injectors.
> In previous experiments with other S4 enhancement systems they had
> installed a K&N cone air filter. They didn't think the ripple was
> enough to worry about but one tech said "hook back up the stock air
> box." Going back to the stock air box that had the plastic air
> straightening passages corrected the problem!
In my testing of HVAC ducting, I have found that I can flow more air
through a duct if I reduce the turbulence. Its also quieter. I even
went so far as to place a piece of aluminum honeycomb in the inlet to the
main blower of the new Seville HVAC system. It worked, so we built a
plastic version of it. You can check it out at your local dealer.
> Apparently the cone filter when supplying enough air for over 25 PSIG of
> boost created just enough turbulence to upset the reading from the hot
> wire and cause the engine computer to reduce fuel and reduce maximum
> allowed boost.
I imagine the turbulence would cause the hot wire to cool unevenly,
thereby giving a false, lower airflow reading.
> This also makes me think about the "?power tubes?" that are placed in
> the air intake track, and that I now see being advertized in "Turbo &
> High Tech Performance" magazine. I guess I'll have to test one.
Or the "hurricane" vortex generating devices? :-)
Interesting find, Mr. Ritchie.
Later,--------------------------- - - - -
Graydon D. Stuckey / \ / \ / \ / \
email@example.com |Mr. Muffler... |
810 733 0255 \ / \ / \ / \ /
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