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Author Topic: Logging MAP sensor raw voltage output  (Read 7604 times)
Scrampa
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« on: May 14, 2022, 11:27:51 AM »

Hello all.

I have a water/meth setup I'm going to be installing on my '01 S4.  It uses MAP, MAF, or Injector duty cycle for activation of the WMI pump.  I will be tapping into the MAP signal wire to feed into the Water/Meth controller, but first want to log output voltage of the MAP sensor during a few pulls so the controller can be better calibrated for activation and flow rate.

Using the M box file.  Is there an address that can be logged for this?  I can't seem to find anything directly relating in my me7logger ecu file.  It has crossed my mind to adjust the factor of pvdks_w, but am unsure of where to start to determine the proper value if it's a viable option.  Maybe a nudge in the right direction would help.

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Blazius
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« Reply #1 on: May 15, 2022, 04:55:19 AM »

Udss_w if I remember correctly.
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BlackT
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« Reply #2 on: May 15, 2022, 05:41:21 AM »

Don't put wmi on MAP signal
If in ME7 for some reason load actual be bigger than spec.
It will close TB and MAP will read very high boost, wmi pump will work but at TB 30% that is really bad
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Scrampa
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« Reply #3 on: May 15, 2022, 06:13:43 AM »

Don't put wmi on MAP signal
If in ME7 for some reason load actual be bigger than spec.
It will close TB and MAP will read very high boost, wmi pump will work but at TB 30% that is really bad


Thank- you both.

BlackT - is that due to the MAP being pre TB (a MAP reading manifold source would be OK)?
« Last Edit: May 15, 2022, 06:15:51 AM by Scrampa » Logged
BlackT
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« Reply #4 on: May 15, 2022, 04:25:58 PM »

Thank- you both.

BlackT - is that due to the MAP being pre TB (a MAP reading manifold source would be OK)?

Yes
Put secomd MAP in manifold or use MAF signal
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Scrampa
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« Reply #5 on: May 15, 2022, 06:07:59 PM »

Yes
Put secomd MAP in manifold or use MAF signal

Great.  Thank-you
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