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SiR S-Spec motor in a 96 prelude.

 
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Old 12-29-2016, 06:11 AM
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SiR S-Spec motor in a 96 prelude.

Hi guys, just purchased a jdm s-spec motor with a M2Z4 tranny to put in my 96 Prelude si after the bottom end of my stock h22a1 let go and died. The motor had 300,000 on it and sadly just did a complete timing belt change about 6 months ago.

I already purchased all the seals (about 20 of them) from Honda to replace and a new flywheel/clutch as well. The motor came with the wiring harness axels and ecu P5M.

My question is considering that the motor and tranny are direct bolt in pieces could I use the jdm wiring harness since the old motor was obd2 or do I need to use the original harness and swap my oil pump, distributor to get the crank sensor over since I see it's all integrated in the distributor on the new motor. I am not worried about emissions testing since for the 96 year and before they use the 2 stage tailpipe test not the ecu hookup.

Especially harness looks brand new and there would be a bit less work I hope it is possible. Thanks for reading.
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Old 12-29-2016, 07:51 AM
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Re: SiR S-Spec motor in a 96 prelude.

yeah emission wise you should be ok if the engine is healthy (and you have new ignition parts etc there) and you use cat

you have to figure out which way would be the easiest for you - to change distributor etc or change the harness because you can get it working in both ways?
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Old 12-29-2016, 11:31 AM
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Re: SiR S-Spec motor in a 96 prelude.

Hey TypeT thanks for getting back to me.

Just to confirm I can then use the jdm wire harness on my 4th gen 96 prelude right.

I was not too sure. Even though they are both obd2 some plugs are a bit different looking.

But if I do instead take the long route then the oil pump and dizzy are all I need to get this running correct? And I can still use the jdm ecu on the stock wire harness as well being obd2a?
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Old 12-29-2016, 12:00 PM
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Re: SiR S-Spec motor in a 96 prelude.

if you use the obd2 harness you may need to rewire something like ac etc

if you use your cars obd1 harness you need obd1 to obd2a conversion harness there and you need to change dizzy, oilpump (and was there something about injectors.. resist box or something?) etc

Im not an expert about electrics like this (since I have only done basic obd2a to obd1 swap which is much more simple than changing more electrics like in your case) but this is how I see it
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Old 12-29-2016, 02:34 PM
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Re: SiR S-Spec motor in a 96 prelude.

My setup on the 96 is obd2 already from factory so I suppose it's easier to use my stock harness and transfer the dizzy and oil pump over to have the hook up connections there instead if trying to rewire it to the jdm dizzy which I hear is not too good anyway. At that point I can use the jdm ecu on my stock harness and get her fired up.

Also just read that the jdm harness is too short because firewall hole is on the right side which does not work for us left hand drive cars.
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Old 12-29-2016, 06:38 PM
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Re: SiR S-Spec motor in a 96 prelude.

my friend used to have the same swap, he blew it up at 150 mph lol
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Old 12-30-2016, 01:48 AM
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Re: SiR S-Spec motor in a 96 prelude.

there you go

remember to do timing components also with manual tensioner!
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Old 12-30-2016, 05:08 AM
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Re: SiR S-Spec motor in a 96 prelude.

Lol 150 mph. :)

Yes, manual tensioner from ks-tuned, new pulleys with gates timing and balancing belts.

Thanks for the help in this one, I was a little unsure on how to proceed.

Will keep you posted on results of swap.
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Old 01-17-2017, 05:51 PM
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Re: SiR S-Spec motor in a 96 prelude.

I think you should keep your 96 wiring and ECU intact mainly because of emissions related reasons, especially if you're in California, but also because of some technical reasons as well.

JDM ecu's are not compatible with US OBD scanner tools.

A Type-S engine is from a JDM BB6 prelude chassis and those use saturated injectors, has different style injector clips (vs bb4), have 290cc injectors.

92-96 BB4 preludes use peak & hold injectors + resistor box and are 345cc injectors.

So if you try and use the Type-S ECU there may be a problem with injectors. The BB6 ecu is programmed for 290cc injectors. I'm sure you can just swap injectors and clips to solve this issue.

The JDM BB6 engine harness is made for a right-hand drive vehicle. There's going to be some issues with the shock tower plugs more than likely.
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