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Doing a y8 swap in my 89si.. o2 sensor?maf?knock&crank

PostPosted: Thu Apr 20, 2017 11:11 pm
by Boogie/89crxSI
Just confused on what I should do with the crank sensor? I know it doesn't use the crank sensor in the Y8because there's one in the distributor already but what do I do with a cap it off and zip tied out the way? Do I do the same with the knock sensor? I'm guessing I just want to wire the O2 straight to the jumper harness after I file which pin goes where. What to do with my mass airflow sensor? I already have done the resister bypass the alternator and distributor wiring. All I'm waiting on are the sensors. Lol rookie questions

Re: Doing a y8 swap in my 89si.. o2 sensor?maf?knock&crank

PostPosted: Thu Apr 27, 2017 8:36 pm
by 7PSI CRX
You confuse me with the statement about resistors and distributor wiring, yet you say you have an Si.

I would have to assume you've converted to OBD 1?

Either Remove the crank sensor or just cut the wire.
(Gotta get under the cover to change the motor mount bracket anyway)

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The only other modifications I had to make were to replace the Thermostat Housing due to clearance / Temperature Sensor issues.

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And carefully trim the Timing Belt Cover for the installation of the A6 Motor Mount Bracket.

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My A6 Distributor bolted up perfectly to the Y8 without any modifications.
(I was running OBD "0" - Stock CRX Si ECU)

Re: Doing a y8 swap in my 89si.. o2 sensor?maf?knock&crank

PostPosted: Thu Apr 27, 2017 8:41 pm
by 7PSI CRX
Wherever you are.

A little more research will get you there

Re: Doing a y8 swap in my 89si.. o2 sensor?maf?knock&crank

PostPosted: Thu Apr 27, 2017 9:04 pm
by 7PSI CRX
I also just realized that i did NOT USE the Y8 intake manifold whatsoever.

So I can't help at all on the intake concerns / questions.

Re: Doing a y8 swap in my 89si.. o2 sensor?maf?knock&crank

PostPosted: Thu Apr 27, 2017 9:44 pm
by 68vert
My d16a6 is getting old/tired, and going to look at a d16y8 tomorrow. The d16y8 is out of an automatic car. I was reading something about the intake not usable because the IAT location? Have you heard anything about this?

Re: Doing a y8 swap in my 89si.. o2 sensor?maf?knock&crank

PostPosted: Fri Apr 28, 2017 7:16 am
by Boogie/89crxSI
7PSI CRX wrote:Wherever you are.

A little more research will get you there



So a little bit more info on my situation. I bought my CRX with the Y8 swap in it already but only mounted in the bay... I was told that all it had to be wired up and it was ready but that was not the case! I had to take the transmission back apart from the block because they didn't have the guide dial lined up properly..then I come to find out that they cut and Hacked up the harness to pieces! :yell: so with a little research I found out I had to do the resister bypass for the fuel and Jack. Then the distributor I had wired a jumper... straighten out the engine bay a little bit but I still don't know what to do with the mass airflow sensor and tps... I'm also having issues with the throttle cable being to tight but with a little playing I can fix that

Re: Doing a y8 swap in my 89si.. o2 sensor?maf?knock&crank

PostPosted: Sat Apr 29, 2017 7:20 am
by 7PSI CRX
68vert wrote:My d16a6 is getting old/tired, and going to look at a d16y8 tomorrow. The d16y8 is out of an automatic car. I was reading something about the intake not usable because the IAT location? Have you heard anything about this?


To answer your question:


Yes, that does sound familiar.
I'm an old man now and can't remember exactly.

Why not just use your existing A6 Intake Manifold?

Bolts right up, no modifications whatsoever.

Easy as pie.

You might miss out on 2-5 HP though.

Re: Doing a y8 swap in my 89si.. o2 sensor?maf?knock&crank

PostPosted: Fri May 05, 2017 9:31 am
by 68vert
To answer your question:


Yes, that does sound familiar.
I'm an old man now and can't remember exactly.

Why not just use your existing A6 Intake Manifold?

Bolts right up, no modifications whatsoever.

Easy as pie.

You might miss out on 2-5 HP though.


Hey thanks for the reply. I'm pulling the Y8 outta the donor this weekend. Got a good deal and since I'm pulling it, I get to take whatever I want within reason. I'd like to reap the full rewards of the swap including converting the AC to R134. Count me in as a member to the old mans club so I need AC.

Do you remember what you did about the injectors? I'm guessing the Y8 injectors wont run correctly with the A6 injector resistor box? thanks again for the help

Re: Doing a y8 swap in my 89si.. o2 sensor?maf?knock&crank

PostPosted: Fri May 05, 2017 10:17 am
by mossin_90
the y8 intake from auto needs to be drilled to accept the obd1 style idle air control valve. the OBDII is bolted to the throttle body. and its a twist type instead of a pull type solenoid.
the side facing the intake manifold has to be drilled to make the passage that connects the air from TB to past the IACV into the I.M, you will nee a 5 sp style throtle body to manifold gasket as well, and yes the side needs to be drilled as well and tapped for new threads of the IACV. IF you are doing this mod do it with the I.M outside the engine to keep shavings from messsing things up(just in case). oh and depending of the IACV you get you might have to grind a bit of the IM to allow the IAC to sit flush against both surfaces(I will try using an Accord IACV). but progress is almost 0 at this point.

these cars have no MAF sensor only MAP senseor.
as for the crank sensor you need an OBDI Vtec dizzy( IF using the vtec head), that is where the crank sensor is located for OBDI.
Vtec head needs a Vtec dizzy, the wheel reluctor is different even if the sensors are there.
I am taking my chances with the OBDII dizy I rewired it and added the Blue cable for the tachometer signal coming from the IGN. Cont .Module the only problem is the engine I bought was seized and I lost the receipt. :cry:
I got a teggy for 700 so the crx sits at the garage almost 2 years now. :oops:

Re: Doing a y8 swap in my 89si.. o2 sensor?maf?knock&crank

PostPosted: Fri May 05, 2017 2:07 pm
by 68vert
I'm planning on buying this harness conversion:
http://www.rywire.com/product-p/ecu-0-1-pkg.htm

I guess I should contact rywire to see if this will allow me to use the OBD2 distributor with a P28 ECM. Anyone know?

Also what about the injectors?