My MPI Conversion (w/ pics :D !)

[ZoskalonMPI]

So last summer, I decided I wanted a little extra power out of my 93 Daytona TBI and spend maybe $50 at the most, since it was originally just for laughs and to treat my car to something nice. I wanted to set up a cold air intake on my car, but fabricating up a new airbox would've been a lot of work, but I saw a guy used an airbox from an omni which looked pretty good so off I went to the junkyard to scavange for that airbox. I never seen an airbox like that before in my life, and didn't find any that time either, but what I did find, was a turbo acclaim, and I remembered reading about this one's guy's conversion to MPI fuel injection. ( http://www.cardomain.com/ride/256160/4 ) So I did some research and it seemed to be a fairly straightforward conversion. I I decided to go along with the conversion, as he stated it was around a $150 maybe thing.

So I took off all I needed, along with a 52mm throttle body, and injectors of the mustang, which I assumed should be ok. Point is, when I did the conversion, my car ran like SH*&, and died whenever I "almost" floored it. So I went back and took some injectors off a 4cyl ford and popped them in and the car ran miraculously, or maybe I got used to driving with the mustang injectors for a week . The only thing that irritated me was the rough idle, but that was said to happen.

I was planning on finishing it all in one day, but turned out I had to drive back and forth to my brother's house over half a week, since he took all the tools with him when he moved out. And he lent me his 99 cougar, with 170HP. And I'm sure because I got used to that power, I couldn't really depermine any power gains when I dropped back down to 100HP + anything I might've gained. But after driving around a bit, realized that it did pull quite harder than it did before, so I was happy. With TBI, I would get to 5500RPM at WOT and the engine would just struggle and not shift or pull any harder, but with the MPI, not only do I now pull all the way to 6000RPM, but I actually shift at that, which is awesome.

Here are some pics (sorry for the quality, was pretty dark outside):

Before:


Midpoint:





Finished :


The air intake on there was meant to be solely temporary, but laziness overcame me from relocating the battery and moving the filter so that it doesn't suck in the hot air right off my radiator

I have a few questions I have for the experts, but I'll put that in another thread. The conversion ended up costing me a little more than expected, but you can't put on price on knowledge learned, since it was the first thing I ever did to an engine

Let me know what you all think and any advice you have or if you see any flaws or stupid mistakes I might've done. Thanks for reading my life story! ha!

[speedyshelby16]

Did you port the opening on the intake to make full use of th 52mm trottle body?

[mpgmike]

Did you install a high pressure fuel pump?

[RPMurph]

how did you wire in the injectors? batch fire?

[TurboTurismo]

are the injectors 19phr?..when you say it idles rough, did that ever clear up......good job.
Robb
http://www.cardomain.com/ride/2291434

[ZoskalonMPI]

Quote:

Did you port the opening on the intake to make full use of th 52mm trottle body?

No I haven't, because since the air isn't being FORCED in, it wouldn't make any difference if it was ported or not, since the neck of that intake is either way just as thin. With forced induction, the air would be actually hitting the flat wall on the intake after the throttle body, but since air is being sucked in, it shouldn't affect performance. Let me know if I'm wrong though :|

Quote:

Did you install a high pressure fuel pump?

No I haven't, because I read that the later year Daytonas had higher pressure system, 39psi I believe? And the guy I copied it off left his pump how it was with no problems. He believed that the 14psi system was in use from 88-90. But if you know better, please let me know.

Quote:

how did you wire in the injectors? batch fire?

Well yes, I'm batch firing them right now, but that is soon to change, as I want to get rid of the violent shaking (over exaggeration) by putting in a turbo ecu. I'll talk about this issue in another thread though.

Quote:

are the injectors 19phr?..when you say it idles rough, did that ever clear up......good job. Robb

The guy said that the 5.0L mustangs had the 19pph injectors, which is what I used first, with the horrible performing. But then I took the injectors off a plain ol 4cyl ford which are supposed 14pph, and they work beautifully. Although, whenever I punch the pedal, the car "stalls" (not sure if that's the term). Like at a stop, if I were to floor it immediately, the car would almost shut off, as if it was drowning. If this continues after the TBI to Turbo ECU swap, I'll ask for help on that. And on another forum, I was told to simply unplug the AIS and plug the whole and just manually open up the throttle blade a little, but when I tried this, the very slightest opening of the throttle would increase the fuel injection, and hence the rpm would skyrocket. So I don't know if its because I'm using a slightly different throttle body or what. But no, the car stills idles as rough as it did since the conversion with the 14pph injectors.

[XxhorizonxX]

how did you get the intake on and off without pulling the head? lol
you better then me.... i tried and to much cussing and busted knuckles so i never did it again........

anyways...... wow the tbi manifold looks like crap..... how does the engine even breathe with that thing?

how much better was the power? gas milage suck after conversion?

also how exactly do you wire the injectors to batch fire them?

[ZoskalonMPI]

Quote:

Originally Posted by XxhorizonxX how did you get the intake on and off without pulling the head? lol you better then me.... i tried and to much cussing and busted knuckles so i never did it again........ anyways...... wow the tbi manifold looks like crap..... how does the engine even breathe with that thing? how much better was the power? gas milage suck after conversion? also how exactly do you wire the injectors to batch fire them?

HAHAHAHA, I went to the junkyard 3 times trying to get the manifold off, finally my bro came with me the third time and took the turbo and exhaust manifold off, it was horrible, but putting that on my car was the easiest thing in the world. I did notice quite a bit of power gain, although I drove my brother's 170HP cougar for a half a week while doing that conversion, so going back to 100 + XXHP was a real bummer and I can't compare, I do know however, that before I would get to 5500RPM at WOT and then the engine would just struggle and struggle and never shift until I let off a little, but now, I get to 6000RPM easily and SHIFT (automatic) but always because I let off the pedal, I get too scared to blow something when I reach 6K hahahaha

I haven't checked the milage just yet, but it doesn't seem that different though. I just barely now, put in 8.6 gallons on a "below E" tank and it was at about 3/4 and now its just below 1/2 and I drove 86 miles, if I reach 145 miles, I'll be at my old 17mpg rating at TBI. Please tell me why I'm not getting the 30mpg everyone else is!!! But then again, I do drive like a maniac hahaha.

And as for the wiring, there are two wires going into the TBI injector, and 3 wires going into the MPI harness (technically 5, but two are grounding wires). I was told recently that this is the harness for the bank fired injection where it was like batch firing, but only 2 at a time, which I don't understand, because not only did I take my injector harness off a 91 TI (which is supposedly sequential injection) but the guy I copied the conversion used the same harness and made no mention of any other possibility. The point is, its extremely simple, the two wires the TBI has, will go to all 4 injectors on the MPI, just make sure not to reverse the wires, you can think of all 4 injectors acting as ONE single injector. Besides the two black grounding wires comming out of the MPI harness, you connect the green wire to the the green wire with orange tracer from the tbi injector plug, and the other two wires are both tan and they connect together to the white wire with blue tracer from the same injector plug. Make sure you sodder them both well and seal them. If you have any other questions, then ask away, I'm thinking of writing up and entire step by step clear and organized set of instructions on doing this conversion tomorrow, so that all may reap for these minor benefits

[GLHNSLHT2]

drop in a turbo ECU and turbo injectors and install a 190l/hr Walbro. It'll run fine then. That's how an old friend did it to his Omni.

[ZoskalonMPI]

Quote:

Originally Posted by GLHNSLHT2 drop in a turbo ECU and turbo injectors and install a 190l/hr Walbro. It'll run fine then. That's how an old friend did it to his Omni.

I got the turbo ecu and harness already, I just need the injectors, and my stock fuel pump should be more than enough, no? I was told its the same as the turbo one's and I'm not gonna been all that pressure anyways since I'm turboless.

[DaytonaTurbo87]

Yes later year daytonas ran the same fuel pump between the tbi and turbo cars. I went thru the blah blah blah in another one of your threads talking about why it would run like crap at times.

[sgtarky]

here is mine, I haven't got it running yet. I am glad more people are doing this. Instead we got some jokers wanting to put motorcycle carbs on them.

[sgtarky]

btw the guy that made that cardomain site where he converts a tbi datona to mpi, lives near me. He told me he has went full turbo on it and is going to help me get mine running. It hasnt cost me much so far, i am just broke and I dont like doing short cuts, do it right first time. I hope to get it running by summer.
http://www.cardomain.com/ride/2141995 btw what did you do with the egr, I made a block off plate.

[ZoskalonMPI]

It looks like you're completely rebuilding the engine, why not just add a turbo while you're at it? And are you going to batch fire the injectors or are you sticking in a turbo harness and ecu?

And yeah, I made a block off plate, wasn't too much trouble, although my throttle bracket and block off plate have completely rusted now, should've painted them or something :|

[TurboTurismo]

I was under the impression if the turbo comp, injectors and harness were used without a turbo the car would be a doggggggggg off the line....That has been the reason I have not done this project yet......alot ppl are trying the tbi comps and wiring it all together to fire at once using small injectors , I have not seen the projects go off without idle problems or W/O throttle issues...On the other side of it, I am sure it does breath WAY better and it does look nicer aswell

Robb