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Old 03-09-04, 09:41 AM
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i was wondering i have an 88 with the 13b rotary. what i would like to do is put the 20bt motor in it. will the 20bt rotary drop straight in or will i have to move the engine bay around to make it fit.any help would be apreciated.
Old 03-09-04, 09:43 AM
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Yes, its a direct bolt in. No modifications are needed whatsoever. However, this has never been done before, so there would be no reason for there to be a section dedicated to 20b swaps.
Old 03-09-04, 09:46 AM
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Hope you have 10k to spend...... It is very unlikely you will ever do this swap.... Just do a t2 swap and be done with it, you can have a hell afast t2 for 1/4 the price of a 20b completed setup and there will still be parts availible if something breaks...my .02 to answer your question No from what i have read it takes some massaging to get it to work right it's not a drop and go setup....... good luck
Old 03-09-04, 10:25 AM
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also would i need to have a new wiring harness or would the wiring harness plug in to the motor.
Old 03-09-04, 10:28 AM
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isnt the 20b a 3 rotor motor??
Old 03-09-04, 10:28 AM
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Youll need to go with a standalone EMS. There is a 20B section on this forum..

https://www.rx7club.com/20b-forum-95/
Old 03-09-04, 10:43 AM
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yeah the 20b is a three rotor motor. i know the my ems itself will have to be replaced but i was not sure as far as the engine bay harness or not.
Old 03-09-04, 06:44 PM
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Yes.

This is about as far from a bolt in swap as you can get. Chances are you're going to be using an engine mangement system that has its own harness anyway.
Old 03-09-04, 06:53 PM
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Yes, you will.

This is about as far from a bolt in swap as you can get. Chances are you're going to be using an engine mangement system that has its own harness anyway.
Old 03-09-04, 07:03 PM
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Yes, you will.

This is about as far from a bolt in swap as you can get. Chances are you're going to be using an engine mangement system that has its own harness anyway.
Old 03-09-04, 08:01 PM
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http://fc3spro.com/TECH/SWAP/COSMO/20b.html
The increased power is going to break all your NA drivetrain parts.


-Ted
Old 03-19-04, 01:38 AM
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yea you would need to basically need to do a T2 swap except instead of the 13BT u would be putting in the 20B. I am debating doin this swap myself, I have been told it gets about the same gas mileage but im still curious about emissions... But with a standalone ems i guess you can adjust it accordingly
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