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B21a1 Into 89 Lude

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Old 05-31-2008, 08:02 AM   #1
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Default B21a1 Into 89 Lude

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
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Old 05-31-2008, 12:11 PM   #2
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Is the B21 OBD1? I would have assumed that they're both OBD1 motors since they're both pre-1992...
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Old 06-01-2008, 03:11 PM   #3
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Im pretty shure the B20 that was in it is OBD0 and the B21 going in is OBD2
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Old 06-01-2008, 06:22 PM   #4
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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...
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Old 06-04-2008, 05:47 AM   #5
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Yea but look i actually read some shit this time

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90-91 2.1 Si preludes with the B21 came OBD1 and a Pk3 ECU.
*Note: You 90-91 Prelude guys do not need the OBD1 Conversion Harness as your car is wired to plug straight into any OBD1 ECU.

88-89 2.0Si preludes came OBD0 with a PK2 ECU.
That came from the Technical Articles and Reference section.
Here is the full thread Turbo Charging 88-91 Preludes.
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Old 06-05-2008, 08:34 AM   #6
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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
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Old 06-05-2008, 08:56 AM   #7
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Originally Posted by 93AccordEX View Post
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.
Nice! See where a little research gets you?
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Old 06-05-2008, 03:04 PM   #8
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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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