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I recently took the car out with the vag-com attached and got some very interesting data back in a spreadsheet. I'll be happy to upload it if anyone cares enough to look at it.
I'm just wondering if itis reliable and accurate? If the boost aspect of it is right then I boost peaked at 27psi on one of my runs!!!Measured 1910mbar ot be exact.Sounds crazy I know. Sounds like a faulty n75 maybe?
Input is appreciated!!
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TT 225 Silver/Black
Red calipers, Forge Black 007p, n75j, Autometer Pro-Comp UL Boost Gauge, 18x8's, Neuspeed Sports with Koni Yellows :-)
yes the boost and timing measures are very accurate up till 22psi, above that its just guessing. We should of got a full 2bar map and not one that that only reaches 22psi [:@]
Audi measures boost with atmospheric pressure included, if you look at their spec sheets they say stuff like a 180's stock boost is 1.8 bar (26psi)...a stock 180 boosts just over 11psi.
A stock 225 boosts 14psi=.9 bar. Add 1 bar for the atmosphere and it comes out to 1.9bar, which is your reading.
Audi measures boost with atmospheric pressure included, if you look at their spec sheets they say stuff like a 180's stock boost is 1.8 bar (26psi)...a stock 180 boosts just over 11psi.
A stock 225 boosts 14psi=.9 bar. Add 1 bar for the atmosphere and it comes out to 1.9bar, which is your reading.
Funny you should mention that... I was just looking at the data myself from the latest run I did and it said I boosted at 30psi?! So I was like, this can't be right, but then I remember my physics class way back when and realized that the sensor is also measuring ambient air pressure ~(14.5psi) while measuring the boost. Like you said, subtract ambient air and you get actual boost. Something I have noticed though is that my requested vs actual is off quite a bit but sometimes it spikes over requested. I don't know whether to believe I have a boost leak or a bad controller controlling the turbo. Here are some of the figures measuring block 115 on vag-com... me going through first and second gear at wot.
First column is time
Second is rpm
Third is requested boost
Fourth is actual boost
Vag-com accurate for measuring engine output?
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