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Old 07-05-2006, 09:20 PM   #1
pictureboy
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Default ?? about reading live boost with AP

What is the highest psi the AP will read? I seem to remember somewhere it tops out somewhere in the 18psi range and will not read higher regardless of true boost level. Am I remembering correctly?
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Old 07-05-2006, 09:31 PM   #2
06rexwagon
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It's limited by what the ECU can measure. I can't remember the exact value either, but I think you're probably right about it being 18psi.
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Old 07-05-2006, 10:41 PM   #3
tkarabian
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18.3 says the Cobb AP manual
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Old 07-05-2006, 10:46 PM   #4
hondaeater69
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IIRC it is 18.3. the stock map sensor can read higher, the limitation of the AP has to do with something else.
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Old 07-06-2006, 08:41 AM   #5
pictureboy
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Thanks for the input. That would explain why I am hitting a max boost of 18.3 rather than the 19.5 my tuner set up for me! I was wondering what the deal was. duh!
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Old 07-06-2006, 09:21 AM   #6
Valhakar
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18.24 to be exact ECUExplore only logs to that unless you use the Manifold corrected pressure User defined variable.
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Old 07-06-2006, 11:44 AM   #7
benw
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manifold absolute pressure FTW! (was told by Tim of PDX to always log this instead of relative)
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Old 07-06-2006, 01:26 PM   #8
pictureboy
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Good info! Thanks guys! Logging was going to be my next step to find out exactly what I'm boosting, but since I just got my old PC laptop up and running I have not had a chance to do so yet so any pointers are appreciated.
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Old 07-06-2006, 05:26 PM   #9
rocketrex
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Quote:
Originally Posted by benw
manifold absolute pressure FTW! (was told by Tim of PDX to always log this instead of relative)
so you take absolute pressure minus what to find boost?
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Old 07-06-2006, 06:05 PM   #10
hondaeater69
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absolute = relative (or gauge) + Atmospheric.

So it would be absolute - atmospheric = relative (boost in PSI).

Atmospheric varies from place to place but is most commonly 14.7.
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