2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

turbo conversion....need pointed in right direction

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Old Apr 23, 2012 | 07:43 PM
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IN turbo conversion....need pointed in right direction

I am doing a turbo conversion on my 87 n/a and my phone wont let me search for what i need.

Need to be pointed in the right direction of how to repin the n/a wire harness for the tII electricals. Thanks in advance!
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Old Apr 23, 2012 | 07:54 PM
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No need to "re pin".. As long as you are swapping a S4 13BT into your S4 N/A chassis, you can use the N/A harness as is. You may need to lengthen the BACV wires, TPS wires, and possibly the alternator plug wires.
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Old Apr 23, 2012 | 08:50 PM
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Thanks. I couldnt remember if it was the s4 or s5 conversion that needed repinned.
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Old Apr 23, 2012 | 08:53 PM
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Also, i dont have ANY emissions on the intakes at all. Will it idle, or do i need anything to keep it idling?
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Old Apr 23, 2012 | 09:04 PM
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As long as you've got the emissions properly blocked off and the car is completely ready to start... it should idle.
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Old Apr 23, 2012 | 09:10 PM
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If you think that the bypass air control valve is "emissions", then you're sadly mistaken and you need to put it back on. Seriously, I don't understand why people feel the need to remove them! Your car could possibly idle without it, but try adding any load to the engine at idle and see what happens.

Not saying you did that, but I've just seen a lot of people remove them. It's aggravating, to say the least.
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Old Apr 23, 2012 | 09:19 PM
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^ AGreen is right. The bypass air control valve has to do with idle/load and is not emissions related. I regretted not having my BACV for the longest time. Reinstalled it, and what an improvement.
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Old Apr 23, 2012 | 10:06 PM
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Mine broke. I dont have another. Never knew it made that much of a difference though.
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Old Apr 24, 2012 | 08:20 AM
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if you have power steering, there was one wire that went from the ecu to the power steering that needs just to be disconnected/pin pushed back. It goes to the knock sensor on turbo ecu. This thread has details, particularly post 7 https://www.rx7club.com/2nd-generation-specific-1986-1992-17/how-make-s4-na-engine-harness-work-s4-t2-ecu-491683/
Also, there is some discussion about the power steering pin issue, work arounds/just disconnecting/etc in that thread. go MR2 electric power steering pump and you will have no problems. that pin goes to some air control valve that adds more air to the engine to compensate for your ps pump working. not a big deal but mr2 pump completely eliminates that problem and no load on the engine from ps.
and a reference thread just in case for the swap
https://www.rx7club.com/2nd-gen-archive-72/s4-na-turbo-swap-details-813825/
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Old Apr 24, 2012 | 10:15 AM
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^ I've heard about that, but never really looked into it much. Very informative thread. Thanks for posting that FC_fan.
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