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

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MERLINS RALLIART & EVOLUTION-X TUNING GUIDESECTION 11 – MISCELANEOUS ECU FUNCTIONS11.01-SPEED LIMITThe Japanese domestic market cars are factory speed limited to 184kph, with alarge speed difference to when normal operation is resumed. This is a dumb idea,as you could be unable to negotiate a corner while the engine is off without thedrive traction while the vehicle is slowing down. Re-set as required.Figure 66:LIMITS – SPEED LIMIT, EVO XThe ON value is the speed at which limiting is triggered.The OFF value is the speed at which normal ECU operation is resumed.11.02-REV LIMITSThe REV LIMIT is a hard fuel-cut. Leave it alone unless the motor is specially builtwith forged rods and pistons etc. Remember maximum torque is around 4000rpmwith standard cams, so that’s where you want up-shifts to land for max acceleration.The SATIONARY REV LIMIT is a function available on EVO 8 and EVO 9, but not onthe JDM GSR EVO 7. It may be available on some EVO 7 RS ROMs. It is only activewhen the clutch is depressed, so the ECU is looking at the clutch switch input totrigger the stationary limit.Figure 67:LIMITS – REV LIMITs, EVO XREV: 0.K merlin@three.com.au Page 98 of 134
MERLINS RALLIART & EVOLUTION-X TUNING GUIDE11.03-THERMO FANThis table controls the two thermo-fans when the vehicle is stationary and up to20kph. The table shows the duty cycle on time to the fans, thus controlling the fanspeed. The Main Fan is behind the radiator, the A/C Fan (air conditioning) is in frontof the radiator. The left column is for the Main Fan, the centre column is for the A/CFan. The right column is for the Main Fan when the air conditioning is operating.With earlier versions of the Lancer Evolution I have generally made some minoradjustment to the fan control settings. The EVO X settings however look similar tohow I would tune an EVO 7-9, so I suggest leaving these alone unless you have agood reason to make a change.Figure 68:THERMO FAN - DUTY CYCLE below 20kph, stock RALLIARTNOTE: On the EVO, the A/C FAN is powered by two relays, which drive the twowindings of the A/C fan. So it is safe to assume the unit can only have twooperating speeds, where 100% is the maximum speed available with both relaysenergized. No tuner has thus-far reported on what duty cycle % the fan speeddrops to the low speed setting. Note that what-ever value is in the 76˚C row isused through the warm-up cycle.REV: 0.K merlin@three.com.au Page 99 of 134
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Merlins Ralliart and EvoX TUNING GUIDE Version K.pdf - EvoScan

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