MAF Calibration Spreadsheet and Demo Video

****Please note that this spreadsheet was designed and tested for the 2006-2011 Honda Civic Si ONLY!!!! It may not work for other accessport vehicles.****

Don't understand all that MAF Calibration math in your ATR handbook? No problem, this speadsheet will do it all for you!

This is our latest speadsheet verison:

Excel ProA Spreadsheet **NEW** & *UPDATED* to v1.3 (Tested with Excel 2003, 2007, and 2010)

Updates in the New ProA Spreadsheet:

• Improved forecasting accuracy for values not found in the datalogs.
• Improved design and logic for more smooth MAF Calibrations.
• More efficient code for faster calculations.
• Ability to delete bogus data and recalculate your calibration
• Go to the Data sheet, find the bogus data values and delete the entire row of data
• Go to the ProA spreadsheet and click the Recalculate sheet and click the recalculate button
• That's it your new recalculated output should pop up

Excel Spreadsheet (original) **UPDATED** (Tested with Excel 2003, 2007, and 2010)

Updates to the Original Excel Spreadsheet:

• Updated to allow the use of ATR Datalogs

 PDF Demo (Requires Adobe Reader 9+)

-------------------------

How do I calibrate my MAF?

If your doing things right, you should be able to get your MAF Cal near perfect with 3 revisions. If you use too many revisions, (7+) then things will drift slowly further apart, and your better to start over then try to correct what went wrong.

This speadsheet can handle 5 datalogs. So lets take advantage of that. Lets treat it as a 3 step process. Start with the stock MAF Cal. After your vehicle is ready to go, monitor your MAF sensor with the AP.

Drive for no less then 20 mins through the city, keeping your MAF between 2-80 g/s. The more steady you are with your foot, the better your reliminary cal will be.The city will calibrate your MAF from 2-20 g/s typically. After 20 mins, try and find some highway. Cruise at 50 MPH for 1 min, then 55 MPH, then 60 and so on up to 80 MPH if possible. Ease into the throttle in 5th gear, to make the MAF read 70-80 g/s at least 10 times. Respect your local traffic laws. After 20 mins your ready to head back.

Run the spreadsheet and upload the datalog. Look at the graph for inconsistencies, PARTICUARLY above 40 g/s. If you see one, check the data analysis portion of the spread sheet to see how many times it averaged that value. Chances are it was only one or two. So instead don't use that value, take a guess with it should be, IE instead of -9% it might look like it should be -4% based on neighboring values. So multiply that stock MAF cal by .96 (- 4%) and paste that overtop value the new yellow value IN the corrosponding location. Keep in mind not ALL MAF values are implemented. In the higher G/S readings the MAF sensor skips and goes 55 to 65 to 85 etc.... so a dip at 57 has no impact, as its not implemented.

Use common sense and when your done, paste this new calibration into your first revsion map. I would recommend driving on this map for a day. Logging when you get a chance city and highway like above, try to get at least 3 30 min logs.

Rinse and repeat the next day for Rev 2. The more logs the better. Cruising at 30 MPH, 35 MPH all the way up, really helps the calibrations. If you take a few logs over several days, you will get more accurrate results then several smaller logs done quickly. The less revisions the better. By the 3rd revision consider monitoring STFT and not MAF, so you can get an idea at different MPH's what the calibration looks like.

Finally in your final revision make sure the MAF Cal curve itself, in ATR, looks like a curve, no straight or flat spots. If its outs double check your numbers. It COULD just be your intake, but its not a very good intake if thats the case. The more exponential the graph looks the closer to the way airflow really affects the MAF.

Good luck and happy tuning!

The AccessTuners Team