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

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MERLINS RALLIART & EVOLUTION-X TUNING GUIDE6.03-KNOCK TUNING - ELIMINATING SHIFT KNOCKThe following HI-OCTANE SPARK MAP graph is included here to show the techniqueto combat shift knock.Shift knock is predominantly caused by residual boost pressure in the intake systemwhen the throttle is closed from a WOT position and the MAF is (momentarily) notgetting the right reading. So, for a brief period, there is too much spark advancebeing applied.It is real knock too, and can be easily proved by reducing the spark advance in theaffected areas will demonstrate.So, the spark advance is reduced a few degrees in the area where the engine hitswhen changing to a higher gear.Figure 29:IGNITION TUNING – Shift Knock tuned HI-OCTANE SPARK MAPIn addition, you need to correlate you HI-OCTANE SPARK MAP with your SPARKADVANCE LOWER BOUND MAP, making sure that the SPARK ADVANCE LOWERBOUND MAP is set lower by 6-10°.REV: 0.K merlin@three.com.au Page 60 of 134
MERLINS RALLIART & EVOLUTION-X TUNING GUIDEThe RALLIART and EvoX have two spark limiting or “boundary” maps, the SPARKUPPER BOUNDARY MAP sets the maximum spark advance that could be used in the3D HI-OCTANE and LO-OCTANE spark maps, while the SPARK LOWER BOUNDARYMAP applies a limitation on the minimum spark advance that could be applied. Thisdoes not actually prevent you from entering values outside the boundaries, theyjust wont be realized.There are some pretty wild variations in these maps between GSR and SSTequipped vehicles and variations form different year models too.On the SST equipped vehicles (EvoX MR and RALLIART), the SPARK LOWERBOUNDARY MAP also sets the spark advance during gear shifts.Reducing the amount of retard in the WOT part of the map will reduce the tendencyto boost spike on SST shifts.Reducing the -20* lower limit to about -5* or -7* in the cruise part of the map willsoften the shift characteristics, making them seen less abrupt.Here are the 53610010 RALLIART spark boundary maps, stock.Figure 30:IGNITION TUNING – stock RALLIART SPARK ADVANCE LOWER BOUND MAPREV: 0.K merlin@three.com.au Page 61 of 134
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Merlins Ralliart and EvoX TUNING GUIDE Version K.pdf - EvoScan

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