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91 CRX Si B18B swap

Discussion in 'Civic and CRX - EF' started by TimFerrari, Sep 20, 2006.

  1. TimFerrari

    TimFerrari New Member

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    Hey guys i bought a 90 crx Si and am aquiring a B18B for $350 everything! i have done tons of research but no one knows antyhing about the B18B. The motor comes out of a 1993 integra ls. ( correct me if im wrong about the B18 B part....i was told it was B.

    first things first...my ecu....i have the integra ecu from the 93...will it plug and play with my wiring harness? ( except the o2 sensor) i know nothing of this OBD0 crap ive never heard of it idk if my crx is OBD0

    i need the 4 wire 02 sensor for this swap i kno....but where do i get the sensor? what make and model should the sensor come off of? the same 93 integra?

    axles should come off the 93 integra
    motor mounts should be aftermarket special for this swap
    shift linkage needs modding


    am i missing anything else for this swap??? please help me out guys
     
  2. jlicrx

    jlicrx Senior Member

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    the 93 Integra LS engine is B18A1 - it is OBD1 - the OBD1 ECU for the 93 Integra is not plug and play with the 90 CRX Si wiring, which is OBD0 - you will need an OBD0 to OBD1 ECU jumper wiring harness - you can use a universal 4-wire O2 sensor - you will need to use your Si engine harness and do some wiring changes to it - the other option would be to convert the engine to OBD0
     
  3. pyro_freek

    pyro_freek New Member

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    im doing the same i have a 89 crx HF i have a b18a1. my concern is the conputer issue i have the ecu from the integra, will i have any problems?
     
  4. drummingpariah

    drummingpariah Author of the Madness Man

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    I have a '91 CRX Si, and just finished putting my b18a1 (1991 Integra GS motor, obd0) in, and am wiring up the wiring harnesses (because I didn't know they needed to be swapped beforehand). I've got just about everything wired up except a few things. Anyone who's done the swap already, call me a noob and solve my problem please!

    One two-pin connector on the d16a6 wiring harness (which is now wired up onto the b18a1 engine) is dangling without a home next to the alternator. Everything else plugged up nicely on that end, but I can't find anywhere to put these.

    There is another two-pin connector next to the battery, on the same bundle of wires that the o2 sensor is connected to. I can see where it plugs in, closer to the firewall on the block, facing the battery, but it doesn't reach. Anyone have a "correct" solution?
     
  5. drummingpariah

    drummingpariah Author of the Madness Man

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    apparantly the alternator-side pin that was troublesome just goes to A/C, and the other one, I just stripped back the wire-wrap on it and plugged it in. All electrical is now a go, and that was actually one of the easier parts of the swap. Now for the shift linkage...
     
  6. drummingpariah

    drummingpariah Author of the Madness Man

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    I have the wiring harness from an obd0 1991 Integra (I had to use my CRX Si wiring harness instead of that harness) and the ECU from it (again, using my CRX Si ECU and tuning that via pgmfi.org). If you're interested send me an email drummingpariah@gmail.com

    I'm also running into copious problems with vacuum lines. I just don't know what's what, and there are 10 lines or so to run.
     
  7. ef8

    ef8 Junior Member

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    Your using the crx si ecu on the ls?Why not just use the integra ecu if its obd0?
     
  8. Andrew

    Andrew Well-Known Member

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    That made me chuckle...
     
  9. drummingpariah

    drummingpariah Author of the Madness Man

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    The CRX ecu (pm6) is much more tuneable by means of flashing than the Integra ecu (PR4) is. I plan to use only flashing until I get my turbocharger installed, at which point I may go to standalone, or see just how far pgmfi can carry me. Long story short, the pm6 is a better platform to tune from, according to pgmfi.org
    here is the link that explains the different families, if you read the descriptions, they're from a purely tuning perspective.
    PGMFI.ORG - Grassroots ECU Development - Library . EcuFamilies
     
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