MPFI Swap CRX

[UfoTofU]

Was reading online a bit and I am confused.

Will ANY Intake Manifold from any second gen. (88-91) CRX fit my 88 CRX? I noticed the Si has a 1.6l engine but mine is only a 1.5l. I noticed online that my CRX has a D15A1 engine and the HF has a d15B6.

I have a guy that has all the parts from an 88 HF that I would need for an MPFI swap (minus the ECU I beleive).

Would these parts be swappable with my car?

[Matt Timion]

Originally Posted by UfoTofU

Was reading online a bit and I am confused.

Will ANY Intake Manifold from any second gen. (88-91) CRX fit my 88 CRX? I noticed the Si has a 1.6l engine but mine is only a 1.5l. I noticed online that my CRX has a D15A1 engine and the HF has a d15B6.

I have a guy that has all the parts from an 88 HF that I would need for an MPFI swap (minus the ECU I beleive).

Would these parts be swappable with my car?

Yep, any will fit.

Remember though, you're going to be using a HF intake manifold, which is smaller than the SI manifold. I'm unsure if the computer will properly compensate for the difference.

[UfoTofU]

Would I be able to put in an HF ECU and then do the swap or do I have to maybe convert over to stick before doing so?

My CRX is currently an auto. I know that all HFs were only stick. Only model that came with an auto as an option was my DX. Does my having an auto bung up doing the MPFI swap?

[Matt Timion]

Originally Posted by UfoTofU

Would I be able to put in an HF ECU and then do the swap or do I have to maybe convert over to stick before doing so?

My CRX is currently an auto. I know that all HFs were only stick. Only model that came with an auto as an option was my DX. Does my having an auto bung up doing the MPFI swap?

Nope. There were Auto MPFI civics... they were the 1990-1991 Civic EXs. You'll want a PS9 ECU.

Hopefully SVOBoy can chime in here as he might know how compatible the HF intake manifold is with the PS9/PM6 ECU.

[SVOboy]

Hi, finally, time to chip in.

It's not a good idea, just because they're designed so differently, so just get a manual ecu and wire up the lockup solenoid outside of the ecu.

[UfoTofU]

Found another guy that has a complete MPFI swap from an 88 CRX Si.
Link:
http://www.gassavers.org/showthread.php?t=2693

He is asking $130 for everything, wiring harness, resistor box, ECU, IM, injectors, distributor, etc.

Any questions I should ask him about the swap parts?

[Matt Timion]

For an MPFI swap, you really don't need the wiring harness. Modifying your existing harness is going ot be MUCH easier than swapping out your old harness for a new one.

I sold a complete MPFI swap for $100 shipped once. Then again, I just wanted to get rid of it.

[Gary Palmer]

I would think that if your going to make the switch, that an intake manifold from an Si might be a better bet, than going with an HF. My recollection is that the HF will fit, but that it only feeds fuel to one valve on the intake, instead of to both valves, like it does on the Si. I have been considering making a similar swap on my 89 Wagon, and I wouldn't be excited, necessarily, to pay $130, but I wouldn't consider it to to be an unduly unfair price, for all of the items it looks like you'd be getting.

Is this unit close enough you could just pick it up, so you could avoid the shipping?

I believe SVOboy has the HF intake on his car, so he'd probably be a good reference for that. I believe Matt also should have a considerable amount of information, as well.

[SVOboy]

I have the CX manifold, and I'd say go with an obd1 d15b7 manifold/setup, cuz, it's cheap, pretty, will match the head better in terms of air flow, and is not so power happy as the Si manifold, plus you won't need to run an injector resistor box. I got my set up for - money, as most of it was free and I sold other parts for more than I paid for them...

But yeah, go for it!

[UfoTofU]

I actually have a d15b7 IM. It looks as though it is missing some hoses and such though. I thought to be safe I would go with a whole setup from this guy minus the wiring harness to save a few bucks.

I could also then sell the IM that I do have and recoup some of the cost.

[SVOboy]

You can't sell a d15b7 IM for anything, heck, they usually go unbought on ebay for 15 shipped,

Post a picture of what you've got and we can fill in the blanks to save you some money.

[UfoTofU]

I don't have anything yet in my posession. The guy is selling the whole set-up.

- ECU
- IM with injectors etc.
- Resistor box
............Ummm, what else am I missing?

All that I have is the d15b7 IM that I probably won't even use. If I don't use it I will give it away for the price of shipping, heck I got it for free anyhow.

[SVOboy]

You'll need a distributor as well. La la. Shouldn't cost too much, I sold my last obd1 non-vtec dizzy for 45, and I thought I got very lucky.

[UfoTofU]

Oh yah, he has the distributor too.

[SVOboy]

Well, if you're ready to take the plunge, go for it.

Be wary that you'll lose your torque converter lock up unless you wire it up manually, since it's usually ECU controlled, but I can tell you how to do that,

[UfoTofU]

I appreciate the willingness to help.

I will have to read a few how-to guide just to get the idea of how it is all done. The CRX is my only means of transportation so I can't really afford to f*** it up.

First DPFI to MPFI and then throw in a stick shift and I will be happy!

[SVOboy]

I've still got a clutch and FW for you,

[UfoTofU]

Wait a second, I am going to need the injector plugs!

[UfoTofU]

Been reading about the swap...

Seems I will have some option on the intake seeing as how the DX setup that I now have won't fit with the intake manifold off the Si.

- Ghetto Fab
- Aftermarket cone style intake
- Get the Si air box and tubes from this kid

What would you guys do?

[white90crxhf]

get the air box.

[UfoTofU]

Would I only need the air box and the tube from the airbox to the IM from the Si or would I also need the resonator and air intake tube as well?

[SVOboy]

You should only need the intake arm. That's all I needed.

[UfoTofU]

Just from the intake box to the IM?

[SVOboy]

Yep.

[UfoTofU]

I have an IM from a '92 Civic d15b7 engine, it has the injectors.

The IM that I got from the '88 CRX Si also came with the injectors.

Would I be able to use the '92 injectors in the IM that I just recently got from an 88 CRX Si and bypass the need for a resistor box?

[UfoTofU]

I ordered a resistor box off a guy on honda-tech. Gathering pieces for my MPFI swap in my 88 CRX DX. I currently have :

- 88 CRX Si intake manifold
- 88 CRX Si ECU (PM6)

He sent me the "Silver Twinkie" style one rather than the boxy one on the left.



Can I use this one or do I need the other type? Hard to see in the pic but the one on the right has a "95" printed on it. Hopefully that doesn't indicate the year because I am pretty sure that I need a resistor box from an 88-91 Si or 88-89 integra.

[SVOboy]

I think the twinkie style is the original, but I'm not sure, I'm not using one. You could always test the resistance.