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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: 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 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) Outer ring has 360 slits Inner ring has 4 windows w/ lengths in slits: 16, 12, 8, 4 (not in this order, TBC) (I don't yet know which window corresponds to which cylinder) VEMS using the same CAS with the "nissan 360 degree secondary trigger" option 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 Knock sensor Original 1 channel, piezo type, mounted between #2 and #3 VEMS using the same O2 sensor Original N/A, stock narrowband removed, Bosch 4.x installed (probably 4.2, TBC) VEMS using the Bosch 4.x WBO2 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 VEMS using the same Fuel pump control Original high side switch, probably, TBC VEMS using the same Q: any "modern" features, like 6V operation, PWM closed loop w/ fuel press. sensor? Auxiliary outputs water pump PWM control for SSR (future) [NOT YET FINISHED]
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