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

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MERLINS RALLIART & EVOLUTION-X TUNING GUIDEFigure 26:KNOCKBASE & KNOCK EVENT - jcsbanksThe main point of this graph is to show the sudden drop in KNOCKBASE andKNOCKFILTADC in the middle of the full throttle pull from 3000 to 7000 RPM.The gain is suddenly divided by 3. The CPU changes an output port that switchesthe gain on the knock amplifier in the ECU before it reaches the CPU. This switch istriggered by KNOCKBASE reaching about 140.The level/gain change is so the amplifier and analog to digital converter haveheadroom to see big spikes and to help signal to noise ratio in a very volatile rawsignal. It's switching is slick and comprehensively controlled by the ECU.Recent versions of EvoScan can log KNOCKBASE at MUT6B and KNOCKFILTADC atMUT6A.A typical knock sensors specifications:VOLTAGE OUTPUT:27mV ±10mV/g.FREQUENCY RESPONSE: 1kHz to 18kHz, ±15% linearity.LOAD RESISTANCE: 100kΩ.OPERATING TEMPERATURE: -40˚C to +150˚C.REV: 0.K merlin@three.com.au Page 56 of 134
MERLINS RALLIART & EVOLUTION-X TUNING GUIDEThe engine has to operate above the OCTANE UPDATE THRESHOLD, with aKNOCKSUM less than 3, before the octane number will be incremented. Thesesettings work well and there is little point in altering them. It is however useful toknow where to run the engine in order to quickly recover the best possible OCTANENUMBER.This next table sets the load and rpm point where the knock control becomes fullyactive. Knock control is active at loads below the threshold, but the amount ofspark retard is calculated differently – see below.Note that the low rpm table cells all have a load value of 159.4. Because the loadscaling is 5/8x, the maximum decimal value that can be put in the table is255*5/8=159.4. This means that KNOCKSUM cannot be disabled at loads above160. This is probably a good idea but it also means that Mitsubishi don’t particularlycare if the engine rattles below 2000rpm. In other words, you wont loose yourOCTANE NUMBER just because of a crappy hill start that got the engine detonatinga bit. If knock is detected at loads below the threshold, then the amount of sparkretard is limited by the maximum Knocksum. In this instance,Max Knocksum = 3*(HI-OCTANE SPARK – LO-OCTANE SPARK)So the maximum knocksum that can be generated is no longer 36, but 3x the deltabetween the two spark maps at the point of knock.Tuners have been able to eliminate false knock that occurred at load = 80 and rpm= 2700 by raising the threshold at that rpm point. The LOAD THRESHOLD v RPMtable values can be raised to say 100, if the false knock was at 90 (for a given rpm).If the value is raised, it will eliminate that false knock condition, at the expense ofhaving less knock protection below load 100 at that rpm.This may be an acceptable solution in some instances. Certainly there are tunerswho have done this and got a good result and cured their problem, but there is abetter way forward to tune out False Knock.REV: 0.K merlin@three.com.au Page 57 of 134
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Merlins Ralliart and EvoX TUNING GUIDE Version K.pdf - EvoScan

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