Table Modifier - The Scan Data Thingy

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The Table Modifier imports data from a PowrTuner scan, the existing Mass Airflow (MAF) table, and the existing Volumetric Efficiency (VE) table and modifies the MAF and VE tables to bring the fuel trims closer to 0. It also allows you to see where each scanned line corresponds to the timing table.

This program could not have been possible without the spreadsheets found on DHP's message board, and all of the people there that contribute to it. There are a lot of people on that forum who really know how to tune a car. A few thanks: JerryH, WebRacin, CCB, and Foghorn just to name a few. I could not have written this without them sharing their knowledge with the rest of us on the DHP board.

A special thanks to Electric97 for creating the spreadsheets this program is based on!

Basically, the program imports a scan, and calculates the average fuel trim (correction) for each cell. The cell depends on the table that is being modified. The MAF table is arranged by the MAF sensor frequency, and the VE table is arranged by the MAP sensor kPa and the engine RPM

After the fuel trim for each cell is calculated, the adjustment is figured. This is done by adding or subtracting the fuel correction percentage from the value in that cell.

If you are not going to import your bin in to the Table Modifier, you MUST know how to import and export using your tuner software.
Click here for help with PowrTuner or Click here for help with HPTuner

Here are a few links to help when using this program
Modifing the Mass Air Flow (MAF) Table  •   Modifing the Volumetric Efficiency (VE) Table
Modifing The GFS and MBTS Tables

Here is a description of how to use this software by doing a MAF tune.

This is the main screen. the first thing you would want to do is to import a current scan generated by the PowrTuner software. The vehicle should be scanned after enough time as passed for your fuel trims to have stabilized. If you don't give the PCM enough time to learn the fuel trims, then no modification will ever be accurate.

Click "Import Scan Data" and locate the scan file you want to import

The first thing you will notice is a message box explaining what you need to have in your scan. Here are the requirements and recommendations for MAF and VE tuning

When you import your scan file, a check is made to verify you have the required fields for a MAF and VE tune. If you had only the LTFT, RPM, and MAF, then only the "Import MAF Table" button would have been enabled. Because the imported scan has at least the minimum required fields, the "Import Scan Data" button turns green. Now, click on "Import MAF Table" and import your current MAF table (this would be exported from the PowrTuner software).

If you imported a valid MAF table, then the "Import MAF Table" button will turn green and the "Export MAF Changes" button will be enabled. Now click "Export MAF Changes". You will see the Options window:

Note: These next pictures are from the current version of this program. If your version does not have the same options, downlod the newest one. There is a link to it on the bottom of this page.

The following options are available if the required PIDs are logged in the imported scan file:

Basic Options


Advanced Options

Fuel Cell Specific

This option allows the user to filer a TPS range within a specific fuel trim cell. You could use this option to filter a portion of a fuel cell. If example, if you wanted to fine tune fuel trim cell 2 when the TPS is above 1%, you could set this here. This filter is applied after all other filters, so if you selected FTC 2 on the Advanced Options tab, then selected FTC 2 between 1 and 5%, that is all that would be changed. Anything not within this range will retain the original MAF values from the imported MAF table.

Misc Filters

When the options screen pops up, all the selections default to what I have found the spreadsheets use. Again, I didn't design the spreadsheets, and they work VERY GOOD. The only problem I see with them, is they don't allow these options, or ease of use. A lot of people prefer to use them, I don't want to take anything away from that. I would recommend using them along with this program. this application is not a cure all by any means.

When you have made your selections, click "Finished" and select the location and name for the new MAF table

When your new MAF (or VE) table has been generated, a popup will tell you the program is finished, the location of the new MAF file, and the location of the report that is generated.

For an example report,
Click Here

The "Export mg/cyl Table" is enabled when the scan and your MAF table are imported. Your current MAF table, and a scan with at least the MAF and RPM logged are required. It calculates the milligram per second, and the Mg/Cyl and RPM cells of the timing table. When the calculations are finished, a new scan log file is written including all of the original scan plus these 3 columns at the end. This way you can see which timing cell the PCM is using when figuring timing.

I used this when I was fighting KR. I knew exactly which cells were giving me trouble, so I knew where to lower timing. When the new .csv file is created, you can sort by KR, see where the trouble cells are, and make the changes. The timing spreadsheet works great also, but I wanted to see which cell I was in for every line of my scan.

If you find you would like to download this software, click the link below. I will be updating this software while I tune my GTP. When I find a need for other options, or a bug in the program, I will update the software and post the updated version here.

Click the link below to download the latest version of Table Modifier

Table Modifier with Binary Support - Last Updated on October 6th 2010

For specifications, update details, and previous versions, visit the Update Page

For questions or comments about this software, please feel free to email me at -

If you would like to see my car, then check out Eddie's 1998 Grand Prix GTP


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