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Old 01-07-2007, 10:12 PM   #1
blkscooby
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OBP

Default Logging boost

I have seen in several people's logs that they are logging boost values 19 psi and above. How is that accomplished? I am running about 19 psi now but my logs only show a max of 18.47.
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Old 01-07-2007, 11:50 PM   #2
gaby
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11.2@130.7

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I got the same problem, my max is 16.87.
04 WRX 18g'd
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Old 01-08-2007, 02:13 AM   #3
druxboyz
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pulled from EcuTEK

"When people discuss boost pressures, they are generally referring to manifold relative pressure. For vehicles running high boost, it is better to view manifold absolute pressure due to the way in which the data is reported: The manifold relative pressure parameter can only report pressures up to around 19 PSI. Beyond this pressure, the ECU will just report 19 PSI. To get around this limitation, read manifold absolute pressure instead. This parameter will read up to approx 37PSI. Subtracting 14.5 PSI for atmospheric pressure shows that this parameter can convey boost pressures of up to approx. 22 PSI.

As an example... If a car is said to be running 16 PSI of boost, this would be a 'manifold relative pressure' of 16 PSI, or a 'manifold absolute pressure' of 16 + 14.5 = 30.7 PSI. That's 16 PSI relative to the atmosphere, or 30.7 PSI relative to a complete vacuum. "

that's a different route i guess. But i assume it works. Hope that helps and i hope you find your real answer.
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Old 01-08-2007, 02:48 AM   #4
qoncept
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Wow, that's kind of a silly thing for ecutek to say. If you want it to be accurate, log both manifold absolute pressure and atmospheric pressure, and subtract that instead. Or if you're using ecuExplorer or Enginuity, you can have the logger do the subtraction for you.
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Old 01-08-2007, 08:06 AM   #5
blkscooby
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I got it. Log Manifold Relative Pressure Corrected in ecuExplorer and that will that the manifold absolute pressure and subtract the atmospheric pressure to get true boost.

Now I have logged a boost of 20.46 psi.
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Old 01-08-2007, 10:26 AM   #6
gaby
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Ok I'll try that today.
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