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#1
06-26-2003, 01:28 AM
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Si Swap ?
Hi,
I have a 90 LX with the DPFI D15 engine. I am going to swap a 90 CRX SI D16 engine into it. Will I need a SI ECU or can I still use my LX ECU and just use FourthGenHatch's HOW TO INSTALL MPFI http://www.fourthgenhatch.com/mpfi.html When reading it I read how it said if engine is out of car just swap DX harness over to SI? What does it mean when you solder and heatshrink over to plug side and harness side? Thanks
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1990 Honda Civic LX 5 Speed 1.5 Liter SOHC K&N Cone Filter APC Short Shifter 1988 Honda Civic STD Hatch 
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#2
06-26-2003, 01:43 AM
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Oh when it says switch your DX engine harness over to the SI engine it means to take out the SI engine wire harness and replace it correct?
So i wont need to do any wire extending. Just wire up the 4 wires that come from my ECU correct?
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1990 Honda Civic LX 5 Speed 1.5 Liter SOHC K&N Cone Filter APC Short Shifter 1988 Honda Civic STD Hatch
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#3
06-26-2003, 02:06 AM
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yes i'm almost positive you need an si ecu or at least an ex ecu i would need one if i just put on mpfi onto my dx engine. your dx ecu just won't controll the multipoint fuel injection.
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I'm no street racer nor do want to be, my goal is a fun car... that leaves SUVs in the dust. current car: red 90-civic-STD-hb with dx trannie, ecu, shift knob, & rear seats. i hate my vynil seats. p.s. i am once again with computer, please forgive the one year leave of absence. 
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#4
06-26-2003, 02:08 AM
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Take off the DX engine harness and put it on the Si/ZC means unplug all the plugs and wires off of the DX engine (same as LX engine by the way) and plug them onto the sensors and stuff onto the Si/ZC engine.
I'm not sure if you have to extend wires from going from DX > Si since they are SOHCs, but from DX > DOHC ZC I know I had to. Plug side and harness side had do do when you cut a wire in half, the half of the wire stuck into the plug is the plug side, the half of the wire that goes to all the other bunch of wires is the harness side. I'm going to get a picture later on to better explain that. And you do need new MPFI ECUs, it says that in my How-To.
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http://www.fourthgenhatch.com FOR SALE: Get this stuff out of my house! -Stock hood (red) $30 -Stock Rear Spoiler (red) $30 -Stock mirrors $30/both -Stock side front and rear side glass $30/piece
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