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

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MERLINS RALLIART & EVOLUTION-X TUNING GUIDESECTION 10 – INJECTOR TUNING10.01-INJECTOR SETUP INTRODUCTIONThe stock injectors on the EvoX and RALLIART are low impedance DENSO unitsrated at 532cc/min. Generally speaking, the stock injectors will give you adequatefuel flow with a TBE, a better hot-side intercooler pipe, stock turbo and 20-22 lbs ofboost by redline.If you plan to use a 20G or larger turbo and or raise the boost level to 25 psi orhigher running gasoline, then it is advisable to get bigger injectors. In this caseinjectors in the 700 – 850 cc/min range will be required as suitable replacements.If you plan to use E85, then think 1050 cc/min as a starting minimum injector size.The assumption here being that other power modifications will be employed, like a20G or larger turbo and other breathing / plumbing modifications plus lots of boost.When you install bigger injectors, you will have to alter these parameters:SCALINGLATENCYSTART – PRIMER IPW v TEMPSTART - CRANKING IPW v TEMPThese tables must be altered in the ECU to suite the new injectors, otherwise theair fuel ratio settings will be way-out, your car will idle poorly and stall on occasion,run rich and generally behave poorly.So how do you go about scaling your new injectors?It has been said on the Evo forums that dialing-in new injectors is a pain in the arseand will require a lot of testing and logging. This may well prove to be the case ifthe injectors are not well documented and in common usage. However, the tunershave developed simple procedures to get just about anything “sensible” dialed-infairly quickly. But you will have to log the trims using EvoScan etc. By “sensible” Imean something less than 1200cc/min flow rate on gasoline.Above that and the ECU struggles or just cant cope as there is a minimum injectorpulse width parameter that sets a floor value of IPW of 1.28ms. Also, the ECU doesnot have peak-and-hold injector drivers. The Evo uses a saturated driver with aballast resistor in series with the injector. This setup will have higher latency timesthan a peak-and-hold injector driver system.As a side note, I have read of tunersadding an external interceptor injector driver box with peak-and-hold drivers. So,just about anything is possible.REV: 0.K merlin@three.com.au Page 84 of 134
MERLINS RALLIART & EVOLUTION-X TUNING GUIDEThe table “TYPICAL INJECTOR SCALING AND LATENCY VALUES” has settings forabout twenty different common use Evo injectors, ranging in size from 680cc/minto 1200cc/min from well known reputable suppliers. If you want to save somesetup time you could do worse than choose from the documented injectors. Thescaling column has an additional note if the fuel is other than 95-98 RON octanegasoline. All the injectors listed are low impedance types, typically 2-4 ohms andwill work with the Evo stock injector ballast resistor box.Note 1: The origin of the tuning information is also supplied so you may be able toconverse further with them for additional information and experiences. All entrieshave reported as yielding good tuned results on evolutionm.net.Note 2: 02 feedback is STFT and what the car is doing, at that very moment, tokeep everything happy. LTFT is what the car has learned over time, to keep the caras close to stoic as possible. So if LTFT is at +12 and 02 feedback/STFT is at +3,then the car is adding +15% at that very moment to try and maintain stoic.Note 3: LTFT range is ±12.5%. STFT range is ±25%. The trims are stored in ECU(RAM) memory and are reset every time you re-flash the Evo9 ECU.Note 4: When the injectors are up-rated, the CRANKING IPW and PRIMER IPWtables will usually require some adjustment, especially if using ethanol blend fuel.Note 5: The fuel trims can be reset to zero by dropping backup power to the ECU.Lift the fuse cover in the engine bay, and remove the 7.5 amp fuse second from theleft, for five second. Replace the fuse. All learned values in the ECU will be reset tofactory defaults. This includes the learned idle control trims.I have included in this section all the relevant START MODE tables and parameters,as they are directly affected by a change of injector type or fuel type like E85.REV: 0.K merlin@three.com.au Page 85 of 134
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