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

MERLINS RALLIART & EVOLUTION-X TUNING GUIDE10.06-INJECTOR TUNING – NEW INJECTOR SETUP METHOD 2Open EcuFLASH and open your ROM. Under fuel locate the Injector Scaling tableand the Injector Battery Voltage Latency table.The scaling parameter refers to the injector size that the ECU is using when makingits fuel supply calculations. The number in the table is usually smaller than theinjector manufactures specified flow rate for a specified pressure. For example, thestock EVO9 injector size is specified at 560cc/min, but the number in the table is513 on the EVO9, as reported by EcuFLASH. As a general rule of thumb for newinjectors with unknown tuning parameters, enter a scale number in the table that is15-20% less than the manufactures rated flow size.For example, let us say that you are using 680cc/min rated injectors and you haveentered in the injector scaling table the value 552. Note that this is only thestarting point and not the end point of injector scaling. The final number will bedetermined through multiple logging sessions of your fuel trims and making someadjustments.Look closely at the Latency table and the characteristic shape of the compensationcurve produced when graphed. At no time should a value be entered that does notconform to this curve, though the curve will be shifted up or down as required andbe a bit more or less curved for different injectors. The latency values in the rightcolumn are in milli-seconds. These refer to the amount of time that the injectorstake to open completely and produce maximum flow. The numbers in the leftcolumn are in volts. As battery voltage decreases, the time between the injectorreceiving the signal to open and when it actually opens increases. Therefore, youmust send the signal sooner to have the injector open at the appropriate time.Physically larger injectors usually require more time for them to open. You can seethat none of the injectors documented in the INJECTOR SCALING & LATENCYPARAMETERS table have a latency value close to the stock value at 14 volts andthis is the voltage that tuners will have to be most precise with. So you will have toincrease the numbers in the millisecond column to compensate for larger injectors.Select from the type of injector you are using, there are usually multiple choices foreach type listed. It is a certainty that one will be better in your engine than theothers, though you will likely still have to make some adjustments.Note1: Injector latency can only increment/decrement by 0.024mS, so there areonly a finite set of values that can be entered.REV: 0.K merlin@three.com.au Page 91 of 134