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

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