I have HP Tuners and I've got my VE and PE tuning done, and I'd like to dial the MAF back in so I can use it again. However, I can't figure out how to setup HP Tuners to log the MAF frequency. As you know, the instructions say:

"1.) Make sure you log Dynamic Airflow vs MAF Frequency (Hz) In HP Tuners it is measured in lb/min so we will have to convert this later for the MAF table (g/sec)."

How do you setup the histograms to do that?

 

I am currently using the #8 Histogram. All you have to do is:

1. Select the # Histogram you want to use.
2. Click on the Configure Histogram button next to #8.
3. Type in the name of the histogram.
4. Click on the PID Heading and expand the Engine list. Expand the Airflow list and select Dynamic Airflow.
5. Select the units you wish to use. I use g/sec with the decimals set to 2.
6. Set the Plot coloring to what you wish. I use 512g/sec as the high and 0g/sec as the low.
7. Select the Table heading and select the MAF Airflow vs. Output Frequency.
8. Make sure the unit is Hz.
9. Click the save button at the top of the window.

On the table display, you can individualy set each parameter to SAE ot Metric. I use Metric for the airflow parameters.

 

Thanks a lot!!

 

there should be a default MAF Error % histogram in there somewhere

 

thanks this is what it is almos time for me also.

 

The instructions I gave will log the actual airflow vs frequency. That can be copied/compared against the stock table. I used the MAF % errror and really did not help much. With the actual airflow, I dialed my MAF table in perfectly and the STFT's are within -4 and -1.

 

So does using this setup bypass all that other junk in the instructions (excel tables, etc)? Can I just copy-paste the values back into my MAF tune?

 

yes, if you're using MAF Error with a wideband

 

Exactly what Ken told me to do....

 

You don't even need a wideband to do this. The table will log dynamic airflow at all the frequency ranges supported by the PCM.You could copy and paste the actual airflows into the MAF table and smooth, if necessary.

 

So how does the engine know what the real airflow is without the MAF?

 

Log dynamic airflow....................

 

I mean without the MAF, what sensors or computer algorithm is the engine using to calculate what the actual airflow is?

 

map based ?

 

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