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18-08-11, 08:57 PM | #11 |
Super Moderator
Classic Audi Club Member
Join Date: Jul 2007
Location: Sissix-by-the-sea
Posts: 15,218
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We set up the Hydrocarbons first, then when hot, worked the CO back... Then, ultimately the CO went too low, so we 'upped' the fuelling again, and it was incredible, as we upped the fuel so the HC's 'didn't' increase.
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1985 WR quattro, 1985 20vT RallyRep, 1993 MTM ABY S2 Avant. 2010 S3 Sportback. |
19-08-11, 12:32 AM | #12 | |
Banned
Join Date: May 2010
Location: Sheffield
Posts: 1,809
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Quote:
But it ain't quite that simple. The dish in which the paddle moves is actually a set of truncated cone sections that approximate a curved surface. As the paddle rises through these cones, more and more air passes per unit angular displacement. The mechanism (a kind of pantograph) that uses paddle displacement to lift the metering head's plunger also moves non-linearly. Cocking all this up in a third dimension is the volumetric efficiency of the engine, which varies dramatically with rpm, etc. You can get an engine in almost any state (air leaks, etc.) to idle - but the key point is that all components should be set up at the same point on the graph. Audi is very insistent, for instance, that the breathers should be detached and plugged whenever an engine is set up - if it doesn't run properly when they're reattached, fix the problem and don't fudge the setup. |
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19-08-11, 07:04 AM | #13 | |
Ragtop Collector
Classic Audi Club Member
Join Date: Nov 2010
Location: Chorley
Posts: 1,463
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Quote:
Wow.... I am just glad the answer was so simple... |
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