Daytona Sensors LLC - Tech FAQ Twin Scan II

Twin Scan II Information

How can I use Excel spreadsheets with the Screamin' Eagle^Ž Pro Super Tuner and Dynojet Power Commander?

If you have Microsoft Office with Excel, you can directly copy and paste data from the Twin Scan II software to an Excel spreadsheet and then copy and paste from the Excel spreadsheet into the tuning program. We have prepared sample Excel spreadsheets that you can download and use for this purpose. Before you try using this approach, you need to make a realistic assessment of your skill level as far as using Excel. Please note that we cannot provide tech support for Excel related issues or help you with individual tuning files. However, since this approach is new, we do appreciate comments, suggestions, and feedback.

The sample Excel spreadsheets are in a ZIP archive file that you can download by clicking on the link below. You will require PKZIP to unzip the individual files within the archive. If you do not have PKZIP installed on your computer, you can download it from the PKWARE Inc. website. Please note that the current spreadsheets only address Twin Cam applications, but can easily be modified by adding rows and columns for V-Rod applications.

Sample Excel Spreadsheets for use with Twin Scan II (about 82 K)

Screamin' Eagle^Ž Pro Super Tuner (Super Tuner)

The current version 3.06 of the Super Tuner software supports copy and paste operations. Some earlier versions and the Race Tuner (SERT) software do not. Spreadsheets for use with the Super Tuner have a filename starting in "ST." There are two types of spreadsheets. The first type (with "AFR" in the filename) has corrections based on Twin Scan II AFR data. The second type (with "VE" in the filename) is based on Twin Scan II VE corrections. The last section of the filename identifies the table format (such as "Advanced") and corresponds to the table formats available in the Twin Scan II software. Use the following guidelines to choose between "AFR" or "VE" versions:

Super Tuner Corrections Based on Twin Scan AFR Data

This approach is recommended for only for applications without original equipment oxygen sensors. In the Twin Scan II software, select AFR Data Display. The Twin Scan II table will show the actual AFR values logged by the system. Start the Super Tuner program and open the Excel spreadsheet. The first sheet is Base VE values. Copy the working VE values from the Super Tuner to the Base VE sheet. The second sheet is TSCAN AFR Data. Copy the AFR Data from the Twin Scan II to the TSCAN AFR Data sheet. The third sheet is Target AFR. Edit the values in this sheet to your desired target AFR values. The last sheet is Corrected VE. These are the calculated VE values required to achieve the target AFR values. Copy the corrected VE values back into the Super Tuner. The cells in this last sheet have calculation formulas. Be careful not to type anything into these cells as this will corrupt the formulas.

Super Tuner Corrections Based on Twin Scan VE Data

This approach is recommended for all applications with original equipment oxygen sensors. Remember that with these applications, you can only change idle and part throttle AFR values with the Super Tuner. Otherwise, closed loop AFR control in the ECM will counteract any changes you make at idle and part throttle. Start by editing the AFR table in the Super Tuner program, then reflash the ECM, and log data. You can also use this approach for any applications where you want to keep the existing AFR values in the Super Tuner AFR table. In the Twin Scan II software, select both VE Percent Correction Display and Use AFR Command as Target. The Twin Scan II table will show the VE corrections required to achieve the AFR values commanded by the ECM. Start the Super Tuner program and open the Excel spreadsheet. The first sheet is Base VE values. Copy the working VE values from the Super Tuner to the Base VE sheet. The second sheet is TSCAN VE Correction. Copy the VE correction data from the Twin Scan II to the TSCAN VE Correction sheet. The last sheet is Corrected VE. These are the calculated VE values required to achieve the target AFR values. Copy the corrected VE values back into the Super Tuner. The cells in this last sheet have calculation formulas. Be careful not to type anything into these cells as this will corrupt the formulas.

Dynojet Power Commander (PC)

The current version 3.2.1 of the PC software supports copy and paste operations. Some earlier versions do not. Spreadsheets for use with the PC have a filename starting in "PC." There are two types of spreadsheets. The first type (with "AFR" in the filename) has corrections based on Twin Scan II AFR data. The second type (with "VE" in the filename) is based on Twin Scan II VE corrections. The last section of the filename identifies the table format (such as "Advanced") and corresponds to the table formats available in the Twin Scan II software. Use the following guidelines to choose between "AFR" or "VE" versions:

PC Corrections Based on Twin Scan AFR Data

This approach is recommended for only for applications without original equipment oxygen sensors where you want to change AFR values. In the Twin Scan II software, select AFR Data Display. The Twin Scan II Table will show the actual AFR values logged by the system. Start the PC program and open the Excel spreadsheet. The first sheet is Base Fuel values. Copy the fuel table values from the PC to the Base Fuel sheet. The second sheet is TSCAN AFR Data. Copy the AFR Data from the Twin Scan II to the TSCAN AFR Data sheet. The third sheet is Target AFR. Edit the values in this sheet to your desired target AFR values. The last sheet is Corrected Fuel. These are the calculated fuel values required to achieve the target AFR values. Copy the corrected fuel values back into the PC. The cells in this last sheet have calculation formulas. Be careful not to type anything into these cells as this will corrupt the formulas.

PC Corrections Based on Twin Scan VE Data

This approach is recommended for all applications with original equipment oxygen sensors. Remember that with these applications, closed loop AFR control in the ECM will counteract any attempt to change AFR values at idle and part throttle. Use this approach to keep the existing AFR values commanded by the ECM, but make corrections for engine modifications. In the Twin Scan II software, select both VE Percent Correction Display and Use AFR Command as Target. The Twin Scan II table will show the VE (same as percent fuel) corrections required to achieve the AFR values commanded by the ECM. Start the PC program and open the Excel spreadsheet. The first sheet is Base Fuel values. Copy the fuel table values from the PC to the Base Fuel sheet. The second sheet is TSCAN VE Correction. Copy the VE correction data from the Twin Scan II to the TSCAN VE Correction sheet. The last sheet is Corrected Fuel. These are the calculated fuel values required to achieve the target AFR values. Copy the corrected fuel values back into the PC. The cells in this last sheet have calculation formulas. Be careful not to type anything into these cells as this will corrupt the formulas.

Your spreadsheet table rows and columns don't precisely correspond to the tables in my tuning software. What can I do?

There are multiple variants and we have tried to incorporate the most common ones. In some cases the tuning software may have a starting row at a very low RPM. Ignore the first row. Just start copying and pasting at a corresponding row in the spreadsheet and do the same when copying and pasting correction values back to the tuning software. We suggest that you print out the entire worksheet and check row and column values to make sure pasted data is properly aligned.

If you require extra rows or columns, you can easily insert them in the spreadsheet and add the appropriate legend text for the new RPM, TPS, or MAP values. Make sure you do it on every sheet. On the last sheet with formulas that calculate values, just copy and paste the formulas from any existing cell to all cells in new rows and columns. Excel will automatically index the pasted formulas so that they refer to the correct cells.

The same considerations apply if you delete rows or columns. Make sure you do it on every sheet.

If you wind up with extra rows or columns that are not part of the standard table formats available with the Twin Scan II software, just copy the rows and columns of correction values that are available. For the empty rows or columns, you will have to manually enter guesstimates based on nearby cells.

Super Tuner files for 2010 touring models use lambda AFR values. Does the Twin Scan II work with these applications?

Yes. Lambda is just another unit for expressing AFR values, with 1.00 lambda = 14.6 AFR for gasoline. The Super Tuner AFR table is in lambda units, so you will have to get used to dealing with these units. Just divide the AFR values you commonly use by 14.6 to arrive at equivalent lambda values. For example, 12.8 AFR is .877 lambda.

The Twin Scan II software is not affected and will still display standard AFR values. These AFR values can be used in the Excel spreadsheets based on AFR corrections. The only place you will have to use lambda units is in the Super Tuner AFR table.

My correction table (either TSCAN VE Correction of TSCAN AFR Data) has a lot of empty cells. What can I do?

The Twin Scan II can only log data in cells where you have operated the bike. Often some cells are empty because not enough samples were available. You can try logging more data at different data logging intervals and adding several data files together as explained in the Twin Scan II instructions. If there are a few empty cells between adjacent cells with valid data, you can manually enter intermediate values in the empty cells.

How can I display throttle position sensor (TPS) values while tuning?

You can easily build a small display for percent TPS values that you can mount on the vehicle during tuning. Refer to the WEGO Tech FAQ (scroll down to the end) for details.