Here's the situation. I have a 1990 CRX DX and I'm going to be getting a 1998 d16y8 from a friend for real cheap. This CRX is not my primary car, but just my daily driver. When I do the swap, I will leave it as DPFI (swapping my DX intake manifold and distributor onto the d16y8 block). I'm doing this b/c i'm not worried about performance b/c it's not my 'real' car. Let's say, down the road, I want to have VTEC working...I'd have to convert to MPFI, correct? And if so, would getting a CRX Si distributor, Intake manifold, resistor box and ECU solve that letting me run an MSD rpm activated switch for VTEC? Thanks for your help ahead of time.

 

everyone told me to convert the car to obd1, and I would almost be 100% positive that you have to have an MPFI intake mani because that's what all 92+ civics run on

 

that dx intake is so ristrictive id say it isnt worth it just convert to mpfi and use the y8 intake manafold

 

the y8 manifold is obd2...won't that cause a lot of problems since the car is obd0?

 

It is obd2, but you can run a Si intake manifold on it and have MPFI and be fine. Or even OBD1 or OBD2 just run it with the OBD0 injectors.

 

Which Si intake are you talking about? ... and WHY?

Just use the Y8 intake manifold and OBD0 injectors. Use your DX harness and convert it to MPFI with the resistor box. No big deal... smae thing as converting with the A6/Z6 manifold, but better! Add vtec with an APEX VAFC and you will be able turn on vtec (no need for relay or any of that stuff) AND you can bump up your fuel map for vtec. Much nicer than the rpm switch... you get what you pay for.

You could also skip the OBD0 conversion and just convert to OBD1 with one of those conversion harnesses. Convert your engine harness with the Y8 one, use a 92~95 CX/DX/LX distributor, and add the 4 wire O2 along with a P28 ECU and you are done.

 

thanks for the responses. The object of this car is to be as cost effecient as possible. The only reason i'm replacing the motor is b/c the current one has either a blown piston ring, bad valve seals, or both. So getting a VAFC and all these harnesses and stuff is really not an option. I don't need it to produce the absolute max hp it can, and therefore i don't need VTEC, but it would be kinda nice to have since the motor does have that capability. So, with that said, what do ya'll think would be my best option?

 

You can run a 88-91 intake manifold with ease, after you wire eveything is fine. Its a lot easier to run. You can use an OBD1 or OBD2 intake manifold if you use OBD0 injectors, convert map sensor wires, etc. I mean its not a lot harder. But he is talking about leaving it DPFI for ease, and it woiuld be easier to leave it with an SI intake manifold, plus there a lot easier to find. He never stated he was getting intake maniofld and everything with the y8.

 

Yeah,... I just assumed he was getting the intake as well. The A6 and Y8 intakes are equal difficulty. What map sensor wires do you have to convert? I have never heard of that efore. If that is even an issue, why not just use the stock D15 MAP that's mounted on the firewall?

 

I'm getting the Intake Manifold and Distributor with it as well, but I want to go with the most cost effective way to do this swap, so that probably means as little conversion as possible?

 

what about a 90 crx hf, with a 95 ex motor, d16z6
i could convert to obd-1, use the p28 ecu, hasport conversion harness, hf dist.
But what about using a pr3 b16, obd-0 ecu, which already has vtec, and will plug right into the hf harness, other than the rev limiter being higher(b16), would it work with the d16z6?? Also would the b16 dist. fit on the ex head??

 

that will be ur biggest mistake right there... i already did that once so i could start the Z6.. was a big mistake... the engine wich its a nice one will be running just or worse than ur old one.. since itsnt design for that type of FI...
the engine will lean out baddly
just spend a few more bucks and do it right.. u wont regret it...

 

All but that HF dist... you use the Z6 dizzy.

 

so you're recommending that I get the CRX Si intake manifold, ecu, distributor and a resistor box, and it'll run fine like that?

 

4dref, would it be easier to just use a pr3-b16ecu, and hook it up that way

or covert to obd-1, and do that.

 

use the PR3 with knock sensor disabled, it runs great, and cheaper and easier than doing the obd1 conversion

 

thanx, but another quick ?, what distributor do i use, i've tried to put a b16 dist on, but it didn't fit?? confused??

 

Are you sure this works good if it does it would save me tons of headaches

 

^^^^^TTT....Does the pr3 obdo ecu have similiar fuel and ignition maps as the p28???someone please elaborate on this a little bit ...please

 

yes it works, i am running it right now, PR3 Mugen Program, Knock sensor disabled , 9500 RPM Fuel cut(i dont rev it past 7400), vtec 5K RPMs. 14.9@94MPH is the best 1/4 mile time i've gotten with my 89 CRX Si, D16Z6 I/H/E, B16 throttle body, Y8 manifold, full interior, street tires. The mugen program runs a little rich, but i tuned it down a little with my Fields Vtec controller(-5@0-1k RPMS,-4@1-2k RPMS, -3@2-3K RPMs, -2@3-4k RPMS, etc) and it runs even better. The B16 dizzy wont work cuz the bottom leg will be right over one of your sensor, just use your dx dizzy or if you convert to MPFI use the A6 dizzy and modify it.

 

Since this is already being talked about....

I am picking up a D16Y8 for my crx hf as well, already have the a6 intake manifold. I was assumign i could use my HF harness and use a PM6 ecu. Would this work or do I need to actually do the obd1 conversion? This is my daily driver and I am not doing this swap for performance purposes at all. Just doing it to get rid of the no passing power HF motor and give the car a little more life and pep. Hell untill this thread I didnt even know the Y8 had vtec. I am sohc retared all my knowledge is in the H series stuff for my accord. Huge thanks in advance or any help.

 

yes thats known to be the easiest way to run that engine.. it will be easy cheap and realiable... u just wont have a VTEC map for fuel.. wich its a deal , but nuttin that will not let u enjoy it.. bc i have that setup and with a RPM swithc i enjoy my vtec very well and pulls hard...

 

will a d16y8 manifold work with the crx si ecu if you swap out to obd0 injectors? Or do i have to run a CRX Si intake manifold also?

 

Thanks for the help, found out is a D16Y7 so it doesnt have vtec after all. Might look for a z6 or y8 head but dont know my money and focus right now are manily on my accord. This deal just happened to pop up and I decided what the hell. Thanks again

 

I dont see why it wouldnt but dont hold me to it. Like mentioned I am D series retared.