DPFI to MPFI Complete Parts List - 88-91 Civic & CRX 

Thanks Jean, and good to know, thanks for letting me know!!

No, same parts needed.

How bout the gasket it’s the same or do I get the y8 intake gaskrt

Get the gasket for whichever manifold you are using.

would the y7 intake manifold also work?

Nice, now you know what to scoop up!

Garage Built Hondas fuck yeah!

Glad to help, hope it gets you back on the road.

Glad you like!! I wanted to try to make a thorough dpfi/mpfi set of videos. I would have the rest finished soon!

Glad to help!

+Greg Hughey Love that people still get back and watch these! I wanted my older DIY videos to stand the test of time, hopefully I'm achieving that!

Garage Built Hondas They absolutely will!!! You go in to so much detail, I don't see how there isn't 500k views. I freakin love your videos Jon!!! You're a badass brother!!!!

+Greg Hughey Thanks Greg, you're so kind, if you were in town I'd get you drunk!! Or buy you some some if that's your thing! Lol

I'm excited for the MPFI swap!! Car feels a lot better now!!

Awesome! Funny that you found it in your car! I'll have the next parts up soon, hope it helps you out!! I'll keep a look out for the cargo mounts for you! I don't have any extras right now.

No they don't, you're correct, plus the CRX was 88-91 in Si

Will be up soon! The car is finished, just gotta put all the video together!

You got it!!

Sweet!

Jon Widmer im in the middle of this exact conversion thanks for the pointers

Awesome, hope it helps!

Awesome, glad you notice and really glad to hear! Thanks for letting me know!!

I seconded what sean had to say, As far as your video production goes what software are you using? I have been trying to make some videos and it's kinda difficult. Any tips?

GarageFixes I use the GoPro Studio still. Lol. I haven't upgraded to a nicer computer and had been using it forever so it's what I still use for now. It's very simple and easy to use. I believe that you need to have a game plan for what you want in the video in terms of the direction and what's included or not included. I try to plan out anything before that I feel would help video because I don't want just some rambling and just talking about whatever. I understand there is a time and place for that in some videos, but in instructional videos I personally don't like listening to someone talk about all this other BS when I'm trying to learn something or fix something. It ruins the flow and purpose of it. And for gear, you don't need the baddest camera in the world. I'm using a Panasonic LUMIX G7 and I love it. I had been wanting a nice camera though and upgraded last May. Before that all my videos were shot on my GoPro 3+ Black and they still came out pretty nice. I've seen people use their camera phones and still make great videos. You need good lighting (make videos during the day), be precise on what you are showing, and be clear and to the point. Think about the shot, how does it look, and what do you want in the background. I try to cut out all the noise, and by that I mean all the stuff that can detract from your videos message. And lastly, film everything. You can edit everything out that you want but you want to make sure that you have everything that you "need" for your video. This video I actually recorded a bunch of parts over a 4 day period because it has been about 2 years since I did an MPFI swap and didn't want to forget any parts! Im subscribing to you (can't remember if I am already) and I'll leave some feedback for any future videos you release. I'd like to see what you have to offer and hopefully I can offer some decent advice!

Thank you for the great advice, it is very helpful. I'm not sure when I'll get my videos up, still working with the software but one day soon I hope.

Jon Widmer my email is berniereyes14@gmail.com

Agreed, that was actually the first time I ever ran it that hard!!

Lol, I'd enjoy it. I love talking shop and helping out!!

If he was my neighbor I'd be creepin always LOL

Thanks brotha!

These guys do not, they are a domestic shop mainly for muscle. If you have a remote tuner, then he can make adjustments on the fly. One of my friends (Bevon Campbell) dyno'd his 13 Si there and his tuner is in Florida. The hardest part is making sure your tuner is ready.

Appreciate it manny!!!

Jon Widmer your welcome Joh loving the videos

Obd1 conversion would be needed also.

Thanks man!! What engine management are you using??

Jon Widmer I am running a ZIF socketed obd1 p75 with Neptune/Demon.

The Si transmission does fell good. It felt a lot better with the Si trans install.

👍

I’m doing this on my 89 auto civic now. Did you have to change the Transmission kick down cable or did you use the stock one? Also, was there anything extra that you had to do since it’s an automatic ?

@@chaunceydarden I used everything off of the P08 mani

That'd be cool, it's always fun to help out!

Thanks Burrito! Nobody really has that accent in Texas, unless you're actually from the country. City folk sound normal. I try to sound pretty monotone as I want the video to retain a more serious appeal to it. I'd like it to be relevant years from now and not just some random dude kinda showing you what you need and how to do it. If you were talking to me in person, I am never this serious sounding. Lol

Very informative! Wait, what about George W. Bush's accent? Was that not for real?

Lol, now that fool speaks like that. He's straight country!!

Good to know. Haha. I'm all the way up here, in snowy Canada. I would love to show you vids/pics of my car, but I would prefer not to do it publicly. Do you have a website or something, where I could send the data?

Nice, thanks!!

You're right, wait and do it all together when ready. Nothing will make your car feel better than refreshing the suspension. 👍 Thanks for the follow!

No, no.

I love parentheses (I actually don't)

Lol. And I agree, still an unusually stout motor! The previous owner had it for 13 years before selling to me and he said he drove it everywhere all the time!!

Looks like it's time to throw a cheap small ebay turbo kit on it and add in boost in small doses at it and see what happens on the dyno( from 3 to 8 lbs with a small front mount intercooler). because its the interwebs and people love that kinda stuff.

True, I'd prefer to put an AC compressor in place of the turbo. 😀

Awesome info, thanks for that!!

I NEED to know are the d15b2 and d16a6 manifolds different between manual and Automatic

+Boosted Fool The a6 is identical except it has one extra coolant nipple on the bottom closest to the thermostat housing. I encountered that with my swap. I do not know if the dpfi manifold has the extra line, but it just might.

Garage Built Hondas what do I do with the extra nipple giggidy lol.

Boosted Fool 3:18 of this video. Take a look real quick. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-EHlkQB0p-xs.html

To answer your questions. No, I don't believe they sell it new any longer. You're DX fuel line will actually work just fine. We used it on a swap we did on a CRX a few months back. The Monotech harness is excellent. And yes! And thanks for the support and watching, I love the diversity! :)

It won't a huge increase in power, but you'll feel it for sure. The throttle response is one of the biggest differences you'll notice.

Probably a Hondata setup so you can get it tuned properly

Ebay, local OfferUp and Facebook. These are used parts, there aren't any links to just buy them from.

Mike Buenrostro I do not believe the Integra harness will connect to the 2 connectors which lead to the ecu. If they are a direct fit then it might work but you'll need to verify that the wires leading to the wiring connector are in the same position from the Integra engine harness to the harness of the crx. If they are the same, you could attempt it. I haven't seen done that way before though, or maybe I just haven't seen anyone document it. I'd try to find all wiring schematics first, and go from there. I know this swap can seem overwhelming but it's really not that difficult. I tried to be as accurate and helpful as possible to make it easy for all future dpfi to MPFI swaps for anyone in the future.

Right, runs smooth still!!

Awesome, that's what I thought!! Thanks homie!!

What else would work I’m trying to convert my wagon and I have a d16y8 manifold

He verified it will work.

would the y7 intake manifold also work?

Each one doesn't work with each respective setup.

It's not difficult. The hose kit I bought had pre-cut shapes that fit the d16a6 perfect (you'll see in the finishing videos of this series) so that was a breeze. You're correct about the valve and that 2 part hose. Smartest thing to do would be drain your radiator. You can drain it into a clean container and re-use it if that's your decision. I do that all the time. No need to change the coolant entirely if it's still within its service limits. But unless you drain it at the block (19 mm drain bolt) then you will have some leaking from the hoses on the rear when you remove them, but nothing to worry about, you'll be refilling the system up again when finished. Hope that helps ease your fears of replacing them!

That helps. Thanks. I am still worried about how to get my hand into there, among all the other components. I guess I have no choice, but to remove any components that are in the way, and then r-install them later. If there is a way to get this done, without such removal, though, seeing it in a video would help. Since you mentioned that you will cover this later in the series, I will wait till then. Cheers!

+Tango Tango It's smaller than the Si manifold. The TB opening and runners are all smaller. You couldn't put a DPFI manifold onto an HF engine. The HF requires 4 fuel injectors and also has the EGR valve on it which also aids on the better MPG's. But for fuel economy, I would stay with the DPFI setup if that's what you already have. The HF transmission with the HF engine are what make the gas mileage ideal. I've seen people use the HF trans on a DX or Si engine and the results aren't as impressive.

Right now I've got a bone stock 91' HF and it's my daily(42mpg mixed driving) it's doing great on mpg, once I have my own house/garage I plan on doing a swap, anyways I'm really diggin your show I've had a wagon and a sedan in the past, now I've got the Crx...I will always drive 4th gen Honda, they are just so much fun to drive!

I love the HF models. I've been patiently waiting on another one to come my way in good shape again. I had one from 12-14 and loved it. I only sold it because my dad gave me a 94 Toyota Pickup that I've been bugging him since forever. I will probably always be into 4th gens as well. They are my generational car for me, I love em!

yes

No big difference, you can use it. If you use the p06 manifold with the matching throttle body you'll need to use the map sensor on the throttle body instead. Everything else will be the same

Jon Widmer the p06 manifold is the DX 92-95? I'll wait for the next videos, and start getting some stuff, I hear the pr4 will make the system richer? is that true?

Yes it is. The pr4 will run rich. When I used it, my idle also stayed high but it will work if it's your only option for the mean time.

Jon Widmer thanks, I'm going to get what I can here in Mexico, great videos man, I think I've already seen all of them

Thanks so much, I appreciate the support!!

You'll need the entire car wiring harness from the 90 EX for it to work. Swapping just the engine harness won't work.

+BRENDAJASON1 thanks!

You need a new distributor.

It's very possible. The gasket is the same for both setups. Did you use a brand new one?

@@GarageBuiltHondas the gasket was mated to the intake manifold, I did not want to break that seal. I am thinking it could not be sealing correctly against the block. Regardless, will be looking at that and the TB gasket. The IACV gasket is brand new.

It's not really mated, it's just old and compressed hence why it probably didn't seal. It has probably been on there for years being flattened. New intake manifold gaskets are a necessity.

@@GarageBuiltHondas thanks man, I have never worked with this style gasket so i figured with its extra thickness it would be more formable. Definitely going to be swapped out today! Thanks for the expedient responses man, definitely appreciated 🤘

Just eliminate the hose for the original map. It's not needed with a TB mounted map.

Yes, it's from the 92-95 Civic here in the states. 👍

Yes, same as mine!

Except my driver seat. It's ripped pretty rough!

Jon Widmer good job though!👍

Thanks man!!

Yes, you will just run all those wires together instead of to the resistor box.

And the hose kit is generic eBay 10pc silicone kit? sorry for the million questions MPFI is probably the hardest thing to do on these things. Also you said the firewall map sensor can be removed for an 92+ intake manifold sensor I'm not sure how one does that.

Yes

The wiring is the same, but you'll need to complete it first for just dpfi to mpfi, then you can add your conversion harnesses.

You confused me with your long sentence. What?

Not dumb at all. Yes it will, 100%. It'll be exactly the same process.

It's stock still. 👍

@@GarageBuiltHondas Thanks!

No, they won't fit. That's an f series engine. That engine swamps a lot more difficult into this chassis.

You have to use your original harness from your chassis and do an mpfi setup.

Correct. The d15b1 is a little weaker too but the same process applies.

@@GarageBuiltHondas thanks. I'm trying to fill my shopping cart with everything I need. What is the best way to find the clips for the fuel injectors and all of the other wiring clips things you have?

Yes. No. No.

Honestly, I'm just "always" looking and jumped on the ones I wanted. They pop up every now and then too!

Sounds like you got pretty much everything except the jumper harness to go obd1. 👍

Thank you man. whats the part # for the throttle cable if you still have it somewhere?

I cannot remember. Go to hondapartsunlimited.com and search a 91 Civic Si. You'll find it there, that's where I bought mine.

Yes

Cat Tran I would leave it alone unless getting an aftermarket upgraded intake manifold. I think the work involved in swapping over another oem stock manifold wouldn't be worth the time/energy.

thanks jon I think it would be better for aftermarket just wanted your opinion but keep up with the good work and keep posting

+Killa Chris it really doesn't matter, as long as all vacuum related items are hooked up. You can even plug any unused ports.

+chickenman493 definitely, those injectors are saturated and not meant to be used with the resistor box. If using the box you'll need peak/hold obd0 injectors.

They are now. Not Pre-covid and at the time of the release of this video. You should follow me on Instagram. I just sold a pm6 ECU for $70 shipped 2 weeks ago and a complete d16a6 intake manifold setup for like $150 shipped.

Lex Definitely

It would be easier to wire your engine harness into mpfi, then do the obd1 conversion using the jumper harness kit for the ECU and the distributor.

None, it will work

Sweet, thanks Ben!!

but to use the y8 intake manifold as i had you have to do some trimming of either head castings or the intake manifold

Where at? What part is the problem area?

Jon Widmer the bottom of the intake manifold where the obd0 and obd1 are raised up they are flatter across on the bottom of the y8 intake manifold

Another thing. I did some testing on 2 setups on a built bottom end (12:1 comp, PG6B piston, Y7 block, and Y7 crank). I did one with a ported D16Y8 head and Y8 manifold and one with a ported Z6 head and Z6 manifold. Each head preferred the intake manifold that it came with. The Y8 head is strange and has a 'tumble' port on the intake side. My guess is that this was done for improved torque. I made the most power with the Z6 head and Manifold using a custom non-vtec cam in the Z6 head casting. Peak power was 151 Whp.

Couldn't tell you. They are for D series, mine came on a hatchback I bought, I don't know the part #.

You need this - amzn.to/2EtZ8yU

Haha, they are pretty darn weak

Thanks, Buddy Club Kuroki F91. Check them out here! ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-4pFe399FZr0.html

Full playlist ru-vid.com/group/PL9veTzRcotDlFXOyJ62YYEnVOUmhHWMpG

pm6 is fine.

PS9 is the automatic 90-91 EX Civic Sedan.

Thank you. Saved me some time having to skim thru forums.

Is your car still dpfi?

Garage Built Hondas it was DPFI when I bought it and it did not run. Owner said it ran for a few years with a D16y7 and DPFI. currently it has the DPFI intake and TB pulled and the MPFI intake and TB In it. I have done none of the wiring at this point. I am waiting on getting a PM6 ECU and Si throttle cable and wanting to clear up the confusion with the Dizzy.

This was all running off the stock 89 CRX DX ECU to my understanding. ECU appears to be a PM5.

You need the mpfi dizzy. It worked on the old setup because it was still dpfi.

Yes. Yes.

Thank you again I already started this amazing project

Note: im swapping to b16, could i bypass this by doing aftermarket ECU (already have), wiring harness(OBD1), TB, intake, fuel rail, injectors, etc. ?

No idea. Is your car MPFI already?

Nope. Pm6 is manual only

@@GarageBuiltHondas thanks well i guess i sell what ive already bought for swap and just keep the original dpi

Any from the obd0 Hondas/Acuras work.

@@GarageBuiltHondas solid, thanks!

+CJrekrap yes, if converting to MPFI and obd0 injectors you need it.

pm6 ml ) or pm6 8t )ecu they should work? i see yours is a pm6 mk

+CJrekrap Yes, from any 88-91 Si

thank you so much for your help! Im going to do this swap on my d15b2 during christmas break. im gathering all my parts now .. i think i just need the right ecu and injector resistor box I think i have everything else. Except a sowing needle. Im sure ill have a few more questions later. Im going to try and do a little video as i swap mine also..

+CJrekrap sounds good, let me know and good luck!!

Yes

Yes

ok thanks I"ll try I have the whole system of an 89 civic ex (intake,harness,ecu ps9)

You'll need the PM6 if staying OBD0. PM9 is still a DPFI ECU similar to the PM5.

ok muchas gracias por la informacion.

Salvador Sanchez obd1 intake manifold yes, but the distributor needs to be obd0 if you are running an obd0 Ecu.

It probably won't be much, but it drives much nicer and has better acceleration compared to the dpfi setup.

Ok perfect, congratulations, I like your videos because you are giving a sense before and after the modification and I think that is key to understand how much is gained or that improves with the new setup, sorry part of this is translated into google

Awesome, glad you like! I've always wanted to make the videos and finally had the time!

I'm not sure what you mean, please clarify?

Garage Built Hondas People always concert from MPFI to OBD1 where you have to take out the resistor box and run some different wires and I’m just confused as to why you’d go through the hassle twice if you could just convert to OBD1 right away while doing the MPFI swap. I’m lost lol

It's all preference. Some aren't ready for all of it at the same time. Money/parts, or time constraints. You can go a couple different routes depending on what you have available.