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IMPORTANT: enter the case-INsensitive alphabetic (no numbers) code AND WRITE SOME SHORT summary of changes (below) if you are saving changes. (not required for previewing changes). Wiki-spamming is not tolerated, will be removed, so it does NOT even show up in history. Spammers go away now. Visit Preferences to set your user name Summary of change: After some consideration of my options, I'm almost set on going with VEMS for engine management. Anything that's cheaper is far less intelligent, anything that's more intelligent is also more expensive. The car is an '89 S13 200SX w/ a built CA18DET engine. 1809ccm, 4 cyl, turbocharged, intercooled, multipoint sequential FI, COP ignition. ---- Aligning VEMS with the engine: ===== POWER ===== See ''FSM'' page '''EF&EC - 80''' for wiring diagram. (ECU = ECCS in Nissan CA18DET terminology) :Original ::The ignitions switch goes into the ECU, there it activates a low-side switch, which operates the actual ECCS relay. The ECCS relay supplies the actual 12V power to the (rest of the) ECU. ||||color||function|| ||ECU pin 16||R/B||switches on/off the ECCS relay|| ||ECU pins 49,59,109||B/W|| ECU power supply|| ||ECU pin 45||B/R|| Ingition switch, ign. on: 12V|| :VEMS ::VEMS has no provisions for this mechanism, it just needs its switched 12V, the end. We need to add this simple switching circuit ourselves, like this. All that is needed really, is a switching transistor. ::http://gtlamateurfest.uw.hu/nissan/2013-01-CAS-oscope/VemsPower.jpg ::This is a quick and easy way to adapt one system to the other. Probably not the best one, but certainly better than powering VEMS from the Ign.Switch signal directly. ::For now, I'll just solder this directly into the wiring, cover all leads in heatshrink, and then ducttape the whole thing. DIYFTW! :) ::(Maybe a capacitor for filtering Ign. switch bounce? Gate resistor if a FET is used? '''TBC''') ====== MAIN INPUTS ====== '''Air metering''' :Original ::MAF :VEMS ::4bar MAP + IAT (already have both) ::MAP will be mounted externally, close to the IM, shortest possible tubing ::5V supply comes from the ECU ::IAT is a BMW type, res./temp diagram '''TBC''' :''Wiring changes - MAF'' ::Cut off MAF at the pigtail, it's 3 wires (12V, GND, signal). Use these for the MAP sensor, which also takes 3 wires (5V, GND, signal). :''Wiring changes - IAT'' ::Need to look for a suitable wire that will be freed up, and goes to the throttle body area, where the IAT will be located. ::*1 or 2 wires? Ground wire could be spliced ECT/TPS ground B wire, which is right there. Only 1 additional wire needed then. ::*Idle switch? 2 wires from ECU, and idle switch is not used in VEMS, but '''TBC'''. '''Crank angle, cylinder pos.''' :Original ::mounted on EX cam, disc has two concentric rings for two optical pickups with OC outputs ::(pulled on up ECU side) ::http://gtlamateurfest.uw.hu/nissan/2013-01-CAS-oscope/ca18detCas.jpg ::Outer ring has 360 slits ::Inner ring has 4 windows w/ lengths in slits: 16, 12, 8, 4 ::''CHECKED'' no. of degree pulses for Window slits High/Low ('''H'''L'''H'''L'''H'''L'''H'''L) '''16''',74,'''12''',78,'''8''',82,'''4''',86 ::'''TBC''' I don't yet know which window corresponds to which cylinder. ::http://gtlamateurfest.uw.hu/nissan/2013-01-CAS-oscope/cas4.jpg :: :VEMS ::using the same CAS with the "nissan 360 degree secondary trigger" option :''Wiring changes'' ::The ''TDC'' (inner ring) and the ''angle'' (outer ring) signals are both wired double into the ECU, on pins 41+51, and 42+52, respectively. Probably a good idea to solder these together, before crimping it into a connector. ::'''JDM swap guys''' and '''RHD M/T guys''' should check their wiring/colors w/ ''FSM'' page '''EF&EC - 82'''. It's a bit unclear, the ''TDC'' and ''angle'' signal has the same wire color (G/B). Label them before you cut. '''Engine coolant temperature''' :Original ::NTC regular type, 2.5kOhms at 20*C, 300Ohms at 80*C :VEMS ::using the same '''Throttle position sensor/switches''' :Original ::Idle switch, closed when pedal released ::TPS ~1kOhms - ~9kOhms for fully released, fully pressed, respectively :VEMS ::using the same, except, there seems to be no idle switch '''Knock sensor''' :Original ::1 channel, piezo type, mounted between #2 and #3, shielding grounded to ECU ground :VEMS ::using the same '''O2 sensor''' :Original ::N/A, stock narrowband removed, Bosch 4.x installed ::'''TBC''' 4.2 or 4.9 ::'''TBC''' for any special requirements for an extension cable, twisting, shielding, etc., or just simple wiring :VEMS ::using the Bosch 4.x WBO2 directly ====== MAIN OUTPUTS ====== '''Ignition''' :Original ::Individual coil on plug, ECU outputs logic 5V signals for each cyl. ::*5V signals go to power transistors mounted in engine bay, these drive the individual coils :VEMS ::using the same, putting out 5V logic signals ::'''Q:''' how difficult to convert the IGBTs afterwards, if needed? (not likely, but still) '''Injection''' :Original ::lowZ injectors with dropping resistors mount in engine bay :VEMS ::need possibility to drive either highZ or lowZ-s injectors, so "active flyback" option required ::'''Q:''' do low-Z injectors still need dropping resistors? '''Idle Control''' :Original ::no idea, probably the same as any other Japanese vehicle from the same era, 2pin terminal, 12V PWM :VEMS ::using the same '''Fuel pump control''' :Original ::low side switch, probably, '''TBC''' :VEMS ::using the same ::'''Q:''' any "modern" features, like 6V operation, PWM closed loop w/ fuel press. sensor? '''Questions so far:''' Flyback type: which one for lowZ, lowZ+R, HighZ? * 30V for High-Z (or lowZ+R), or active flyback if low-Z inj planned (to have the option to run without series +R). ETC: for 2wire ETC, where is the 2nd wire connected? * Between the 2 "bridge" outputs, see [http://vems.hu/vt/help/v3/v3_electronic_throttle_control.html VT Help] Triggers: * primary=HALL * sectrig=HALL, in order comment "Nissan 360 pulse HALL" (so smaller C103 cap is fitted than for the standard normal low toothcount sectrig) ** also refer to this page in order comment and add some signal/hangouts/skype/webrtc access if possible (for some discount; normally discount is only granted after successful documented install, but anyone who is prepared to a certain degree, deserves all kind of help from others too: prefer IBAN/pay later option, so full amount is not paid). [NOT YET FINISHED] Optional: Add document to category: Wiki formatting: * is Bullet list ** Bullet list subentry ... '''Bold''', ---- is horizontal ruler, <code> preformatted text... </code> See wiki editing HELP for tables and other formatting tips and tricks.