Porsche Electronics Specialist

Cambridge, England

The SharkPlotter program for the SharkTuner

The "SharkPlotter" is a companion program for JDSPorsche's "SharkTuner" for the Porsche
928. The purpose of SharkPlotter is to assist with the review of data that was logged from
SharkTuner and to provide some tools for further optimization of fuel and ignition tuning.
It provides plots of AFR vs. MAF load and RPM for the LH processor, plots of knock
events vs. load and RPM for the EZK, and the ability to manually or automatically adjust
the LH and EZK maps for the best "fit" with the data and review the results.

The SharkPlotter program can be used with both the SharkTuner Mk1 and the Mk2.

This powerful tool is the latest addition to the SharkTuner family. Sharkplotter software is available free of charge to registered owners of JDSPorsche's SharkTuner or SharkTuner2. It will be distributed free of charge to registered SharkTuner Customers either on the SharkTuner software CD as a separate installer ("SharkPlotterInstall"), or can be downloaded from SharkPlotter website

If you have questions or need help: First read the manual SharkPlotter User Manual(PDF file, right-click this link to download a copy) If you can't find what you want there, then go to Rennlist and search for "SharkPlotter" If you are still stuck, then send an email to support SharkPlotter support .

The basic SharkPlotter window is shown below. The main window area is a color-coded AFR plot on a grid that matches the LH correction map, engine load (SharkTuner's "MAF signal/absolute") vs. RPM. Air/fuel ratio is shown as color, from yellow as too rich through green and blue (stoich) to purple and red as too lean. The plot is scaled to actual MAF and RPM values, with each grid-square represents a LH adjustment "cell" (hence the irregular grid).

SP LH plot

SharkPlotter also offers some tools to help with ignition tuning. If knock-retard is included with the log files then knock events (an increase in knock-retard for any cylinder) are displayed on the AFR plot as an "X" through a data point. A light "X" indicates that the number of cylinders retarded, and the maximum retard, did not exceed the threshold (3 cyl's and 2 degrees by default). A bold X" indicates that the knock limits were exceeded, and attention is needed. Here is a plot of mid-range testing (zoomed) showing a few knocks in the 4000-5000 mid-load area:

SP EZK plot











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