Merlins Ralliart and EvoX TUNING GUIDE Version K.pdf - EvoScan

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MERLINS RALLIART & EVOLUTION-X TUNING GUIDE13.03-VIRTUAL DYNO – LOG FILESVIRTUAL DYNO requires .csv files to operate, these are usually derived from thenormal logging process using the EvoScan logging application. What we are lookingfor is wide open throttle power pulls, on flat road, in either 3 rd or 4 th gear. Wherepractical, I will try and start going WOT from about 1500rpm, and hold WOT rightout to redline. Power pulls like this are also very good for assessing knock and yourspark maps. This is simple enough, but there are things you can do to improve thefinal graphed results.Understand that the application calculates the wheel power by the rate of change invehicle speed, ie its acceleration. Curiously, this is one time where you do not wantthe log sample rate to be to short or close together, this will create errors and avery lumpy graph. It is easy to get good results though, you just need to pad thelog with an appropriate number of log items. What we want is rpm samples aboutevery 100mS to 250ms, this will give a very good result. Here is a sample fordiscussion.This sample log shows the parameters I will log, and the order I place them in thelog for good readability. Note that the sample rate is about every 100mS which willyield a smoother graph without having to use a high smoothing factor.This sample log has also been manipulated to improve readability:Removal of unwanted columns.Removal of unwanted decimal places in the data.Top and tail the log to remove all unwanted stuff like idling and run-down etc at thestart and end of the log.First off, I delete from the raw csv file all the columns I do not want in the log, suchas LogEntryDate, LogEntryTime, LogNotes and then all the columns to the right ofthe last wanted column.To do this, left click on column alpha lable, eg B, C, E, then right click and delete.To delete all the columns to the right of the last wanted column, left click and hold,then drag across all the unwanted columns, then delete.REV: 0.K merlin@three.com.au Page 110 of 134
MERLINS RALLIART & EVOLUTION-X TUNING GUIDEMy next step is to fix the decimal places in the data columns, who needs 5 decimalplaces for TPS or four for Load etc. To do this, left click on the columns you want tofix, eg we want to set zero decimal places in the TPS, RPM and Load columns. Withthe desired columns highlighted, select Format/Cells.Select Number and then set the Decimal places to zero. You can see that in thislog I have also set the IPW to two decimal places but you can set as desired foryour purposes. Don’t manipulate the LogEntrySeconds column though, as thatwould corrupt the power calculation.The final tidy-up step is to top and tail the log, stripping from the log everythingthat is not the power pull. This is not really necessary now as Brad has improvedthe application such that it will find the power pull automatically. I still do it thoughso it is easier for me to review client data later or when sending the file via email.Left click and drag the mouse to highlight the area to be removed. Hold the pointerover the highlighted section and right click, then delete. A little window will open,with Shift cells up selected. Click OK and the highlighted section is removed.REV: 0.K merlin@three.com.au Page 111 of 134
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Merlins Ralliart and EvoX TUNING GUIDE Version K.pdf - EvoScan

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