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B21a1 Into 89 Lude

Discussion in 'Prelude' started by 93AccordEX, May 31, 2008.

  1. 93AccordEX

    93AccordEX New Member

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    My buddys car took a shit he has a 1989 Prelude 2.0si. ( B20a5 - OBD-0 )
    He had a chance to buy a B21a1 With the 5-speed tranny ECU Mounts and all.

    Here is what i want to know.
    Is there any thing else i can do besides converting his car to OBD-1 to get this motor in and running?


    (Update)
    If i swap his intake manifold, distributor and all the other shit from his old motor will it run with the b20 ecu?
    Im allready using his b20 wiring harness on the B21.

    We are not looking for power gains!!! Just a running lude :)
     
    Last edited: May 31, 2008
  2. BrutalB83

    BrutalB83 Brutal Moderator Moderator VIP

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    Is the B21 OBD1? I would have assumed that they're both OBD1 motors since they're both pre-1992...
     
  3. 93AccordEX

    93AccordEX New Member

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    Im pretty shure the B20 that was in it is OBD0 and the B21 going in is OBD2
     
  4. BrutalB83

    BrutalB83 Brutal Moderator Moderator VIP

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    OBD2? Nah, I don't think so. There are a few small exceptions, but the general rule for OBD is that anything before 92 is OBD0 (this is where the exceptions are; a few cars implement OBD1 early), 92-95 is OBD1, and 96+ is OBD2. Since both engines came from cars before 1992 they should both be OBD0...
     
  5. 93AccordEX

    93AccordEX New Member

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    Yea but look i actually read some shit this time :)

    That came from the Technical Articles and Reference section.
    Here is the full thread Turbo Charging 88-91 Preludes.
     
  6. 93AccordEX

    93AccordEX New Member

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    Wooo Hooo Lats night i changed the dizzy with the one from the B20 and she fired up!!!!
    If possible ill get some pics up from the swap.

    1989 Prelude Si
    B20 to B21 - Swap
    Auto to Manual - Conversion
     
  7. BrutalB83

    BrutalB83 Brutal Moderator Moderator VIP

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  8. 93AccordEX

    93AccordEX New Member

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    Hell yea!!!

    And where i said i think the B21 is OBD2... i meant OBD1 I know OBD2 is 96 and later it was a tired mistake hahaha i was friggin bout to fall asleep :)

    Thanks again man
     
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