TT (Mk1) Discussion Discussion forum for the Mk1 Audi TT Coupe & Roadster produced from 2000-2006

N75 % duty question - are these numbers "normal"?

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Old Jun 10, 2007 | 07:07 AM
  #1  
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Default N75 % duty question - are these numbers "normal"?

Ran logs yesterday and noticed the N75 cuts to about 75% (intentionally bleeding off boost?) at 3000 rpm, consistent for three runs I did.

Also, on the intercooler presure, as it drops above 4500 rpm or so - is that the turbo running out of steam?

RPM IntakeTemp N75 Intercool MAF

/min °C % mbar g/s

2000 49 95.3 1080 6.86
2160 48 95.3 1330 31.36
2360 48 95.3 1580 40.11
2600 47 95.3 1950 53.83
2920 47 81.6 2270 73.97
3240 47 75.7 2430 90.08
3600 47 74.5 2370 98.33
3960 48 75.7 2340 106.47
4320 48 76.1 2310 123.92
4720 49 75.3 2150 129.25
5000 50 75.3 2020 130.78
5360 51 75.7 1950 136
5680 51 75.3 1870 137.08
6000 52 77.6 1810 141.58
6280 54 79.2 1800 146.06
6560 54 76.1 1770 148.72
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Old Jun 10, 2007 | 07:27 AM
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Default Yes......Typical boost taper..

Lower percentages = more boost diverted to the wastegate actuator to crack it open a bit..
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Old Jun 10, 2007 | 07:48 AM
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Default great, thanks! :-) >

now I'm starting to learn something!
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Old Jun 10, 2007 | 01:23 PM
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Default

that g/s looks pretty low for a k04. Not sure if its normal for a 180K04 though.
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