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Problem with h23a bluetop wire harness

 
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Old 04-13-2011, 04:33 PM
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Icon5 Problem with h23a bluetop wire harness

I have a 92 honda prelude si 4ws that I'm putting a jdm h23a dohc vtec bluetop in. I'm stuck at the wire harness due to the fact that it's obd2 and the car is obd1. I also bought a chipped p28 ecu that's obd1. Does anyone know what I should do to get this thing on the road or someone else besides rywire that sells a Hmil-Spec harness? Thanks
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Old 04-13-2011, 05:59 PM
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Re: Problem with h23a bluetop wire harness

hey u use ur old wire harness(im assuming u got the h23a1) then u add 2 wires from vtec solenoid to the ecu. and ur done.
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Old 04-13-2011, 06:18 PM
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Re: Problem with h23a bluetop wire harness

Use your old OBD-I ignition parts.
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Old 04-13-2011, 07:54 PM
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Re: Problem with h23a bluetop wire harness

It originally had a h23 but when I purchased it it had a f22 I'll post some pics. Rywire was going to sell me the harness that links right up to the chipped p28 ecu to the motor but it won't be in for about 2 months. The f22 harness won't link up to this motor and I'm not sure if just going out and finding another prelude at a junk yard and taking the h23 harness off will work because of the length of the wires, it won't match up because the jdm model h23 has all the wires on the other side. Thanks again guys.
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Last edited by 92ProjectSiPrelude4w; 04-13-2011 at 08:01 PM.
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Old 04-14-2011, 12:03 AM
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Re: Problem with h23a bluetop wire harness

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Originally Posted by 92ProjectSiPrelude4w View Post
It originally had a h23 but when I purchased it it had a f22 I'll post some pics. Rywire was going to sell me the harness that links right up to the chipped p28 ecu to the motor but it won't be in for about 2 months. The f22 harness won't link up to this motor and I'm not sure if just going out and finding another prelude at a junk yard and taking the h23 harness off will work because of the length of the wires, it won't match up because the jdm model h23 has all the wires on the other side. Thanks again guys.
the only difference between the h23a1 and f22 harness are two wires, IAB and knock sensor(ithink) while the h22 harness has all 4 wire knock sensor , IAB, vtec, oil pressure switch (thats the only wires u need to get the swap done.)

i only answer ur question n ur first post bc i thought that was ur only problem.
but ur reply tells me u got more problem(s). i dont know if u did a research first before purchasing this engine. but this swap is not a plug n play.

but answering ur question first
USDM f22,h23a1,h22 harnesses wont be a plug n play on JDM engines.
but u dont play around with the harness but u look for the usdm component that is needed . for example h22 swap u suppose to use usdm fuel rail and use usdm distributor

ur swap h23vtec has the same concept. but u have to do MORE .
the only part u can use in the h23avtec is basically just the longblock
this is the extra parts u need for the swap to WORK
*h22 4thgen downpipe
*h22 obd1 intake manifold
*h23/h22 usdm fuel rail
*obd1 h22/h23 usdm/external distributor
* h22/h23 ignition coil ,
* h22 ignition coil mount
*if your keeping the power steering u need h22 crank pulley and h22 ps mount
* if ur h23vtec didnt come w/ ac and u wanna to keep that. u need to change the pulley in ur ac bc i believe it has less teeth im not sure w/ this
* obd1 h22 injectors

like i said ur only basically using the LONGBLOCK of the h23vtec bc were obd1 and h22 parts bc h23vtec has a h22 head.

but u said ur getting a p28 so u wont have to worry about ur knock and IAB!
u just have to wire the vtec and the oil pressure switch.

im sure im forgetting some little things. but those i listed are the major 1's

and im giving u this answers from my own experience and a couple of ppl in pp.com and pz.com that help me w/ the swap a couple of months back.

Last edited by jackp0t; 04-14-2011 at 02:13 AM.
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Old 04-14-2011, 09:56 AM
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Re: Problem with h23a bluetop wire harness

Do you know why it is that I can't use the manifold and distributor? I was really trying to keep all the parts that came with the engine so that I wouldn't have to spend over $500 more than I already have. Do you think if I did buy that harness from rywire it will hook up to everything and run correctly?
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Old 04-14-2011, 10:12 AM
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Re: Problem with h23a bluetop wire harness

Do you know what motor mount I need for the drivers side because the one I have is for an h23 and doesn't line up. Should I get an h22 mount for this?
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Old 04-14-2011, 10:16 AM
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Re: Problem with h23a bluetop wire harness

So what you're saying is that I can get all of those parts and then just use the harness from the f22 and everything will hook up right?
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Old 04-14-2011, 02:09 PM
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Re: Problem with h23a bluetop wire harness

I dont see why you need the jumper harness for the ecu, and as far as the mount you need a h23/h22 mount. the one that bolts to the engine and the mount itself that bolts to the frame.
as far as your other problems
instead of getting a different fuel rail bc the rhd issue just get a fuel line made to reach across, and just swap out the intake plenum off a h23 on the bluetop. I would use the f22 wiring harness and change over injector plugs and the others instead of making it such a complicated task. I've been sorta the same issues when i did my f20b swap.
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Old 04-14-2011, 03:10 PM
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Re: Problem with h23a bluetop wire harness

Yo, 92ProjectSiPrelude4w, the p28 that you're getting, is it for an automatic or manual?
Where'd you order yours from, and how much?
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Old 04-14-2011, 07:45 PM
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Re: Problem with h23a bluetop wire harness

Quote:
Originally Posted by 92ProjectSiPrelude4w View Post
Do you know why it is that I can't use the manifold and distributor? I was really trying to keep all the parts that came with the engine so that I wouldn't have to spend over $500 more than I already have. Do you think if I did buy that harness from rywire it will hook up to everything and run correctly?
because our car is obd1 and the motor is obd2. i think what your buying from rywire is a jumper harness for the ecu right . that doesnt make sense to me because ur obd1.lol
so lets get this clear ur planning to use the h23avtec harness right so its going to be obd1 to obd2 and then back to obd1 .lol
Quote:
Originally Posted by 92ProjectSiPrelude4w View Post
Do you know what motor mount I need for the drivers side because the one I have is for an h23 and doesn't line up. Should I get an h22 mount for this?
i use my h23a1 mount w/ mine trye switching ur f22 mount to the h23v just the driver side
Quote:
Originally Posted by 92ProjectSiPrelude4w View Post
So what you're saying is that I can get all of those parts and then just use the harness from the f22 and everything will hook up right?
YES. thats what everyone else have done.

basically ur just making everything more complicated by using a obd2 harness into a obd1 car

most obd2 car use haness jumper to convert there car into obd1
if you go to pp.com and search my name "jackp0t" i chronicled my swap
i made a thread when i did my swap every little problem i encountered .
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Old 04-15-2011, 06:03 PM
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Re: Problem with h23a bluetop wire harness

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Originally Posted by TheLudeDude View Post
Yo, 92ProjectSiPrelude4w, the p28 that you're getting, is it for an automatic or manual?
Where'd you order yours from, and how much?
I got my chipped p28 ecu from phearable.com for a couple hundred and it's for a manual 5speed. They specially tune it for whatever engine you have even if it's automatic.
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Old 04-15-2011, 06:07 PM
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Re: Problem with h23a bluetop wire harness

Thanks everyone for the help. I got a guy that's going to be working on it in about a week when all the parts come in.

Do any of you know if I'll need a vtec wire installed? I heard some of my year preludes already had one?
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Old 04-20-2011, 05:05 PM
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Re: Problem with h23a bluetop wire harness

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Originally Posted by 92ProjectSiPrelude4w View Post
I got my chipped p28 ecu from phearable.com for a couple hundred and it's for a manual 5speed. They specially tune it for whatever engine you have even if it's automatic.
I just contacted them, asking if they would be able to set me up an ECU for the H23 DOHC VTEC that will run an Automatic Transmission (the H22 Auto Tranny). I've yet to receive a response from them. But I'm crossing my fingers that they say than can do one for me.

Because I've contacted another ECU company, and they told me that a chipped p28 ecu for the H23 vtec only comes in Manual, and that I won't be able to make this swap work because there's no p28 Automatic trans ECU's.

All this has set me way back from doing this swap, and I hope they're not right, because I'm very determined to make this work. >:(

Anyway, thx for the Link.


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Old 04-21-2011, 12:31 PM
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Re: Problem with h23a bluetop wire harness

Ah, they don't do Automatic ECU's. No worries, found someone on craigslist.
Thanks anyway.


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