How do I interpret boost with VAG-COM?

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06-10-2004, 06:42 AM

jatava

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How do I interpret boost with VAG-COM?

I don't know if you guys can see the pic clearly so here is one line:

(TIME STAMP)18.85
(RPM)5440
(LOAD %)170.7
(Abs. Pressure mbar)2060
(Abs. Pressure mbar)2530

Why the 2 boost readings? What does LOAD mean?
I can't possibly be running 2.5 bar(36.68 psi) boost!!

VAG-COM Log FIle:
<img src="http://pictureposter.audiworld.com/10982/boost.jpg">

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06-10-2004, 07:32 AM

Chaddy

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I think you have to subtract standard atmospheric

pressure from the absolute pressure readings to get the gauge pressure (boost). Standard atmospheric pressure at sea level at zero degrees Celcius is 1.0133 Bar, so that would make your numbers more realistic (around 1.3 Bar average). Is the chip set-up for the K04s? Not sure why there are two pressure readings, I haven't gotten to play with my VAG-COM or read the Audi service manual yet!

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06-10-2004, 08:49 AM

Eric 2.7

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Requested and supplied boost are the two readings. Not sure about load.

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06-10-2004, 09:32 AM

QCRAZY

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As stated below, the first boost value is specified and the other is...

..actual.

Engine load is a function of air flowing into the engine, it's how your fuel injection time is calculated.

You peaked at ~1.4bar after you cut throttle. May want to check your BPV vacuum lines, you had a slight spike.