D15 Turbo Help?

[ornge04gt]

Alright guys. Im new to the forum so ill start off by saying hi my names Joe. So im postin because i used to be a honda guy then merged to ford and played with mustangs. But the whole time i had my civic project sitting in my garage and i decided i want to finish it and use it strictly for drag only. So heres the deal. Im not looking for any flame just serious help please. I bought the car with a D15B2 and i decided instead of doing a motor swap and changing everything over that i was gonna build it because i work at a automotive machine shop. So my motor is built with the whole nine yards....rods,pistons,polished crank, spiral polished 1.6 valves, springs, custom ground cam, block gaurd,port and polished and so on. So its by far from stock. So its capable of holding boost. But i got the dpfi setup. Now heres the catch. Im keeping the dpfi no matter what. Because i had my head aluminum welded and port and polished to match with the runners of the dpfi manifold. So i cant swap it. So now im stuck on what to do with fuel?? I have a fuel cell in the trunk. But what about injectors? I read that u can run 5psi but thats asking for trouble. I dont wanna go and blow something up that i spent alot of time and money on. So please tell me what my options are for DPFI?
By the way its a 89 civic hatch. and heres a quick pic.

 

[Shiznit]

edit: i dont know much about mpfi or if they can run a piggyback. im pretty sure they cant. the only option i can think of is to use an FMU

 

[ornge04gt]

edit: i dont know much about mpfi or if they can run a piggyback. im pretty sure they cant. the only option i can think of is to use an FMU

Can you point me in the direction on what i need for s fmu? and explain what it is?

 

[Shiznit]

it basically reads your vacuum pressure and dumps fuel in accordingly. they have different A/F ratio fmu's, you want the 12:1 ratio since thats as close to stoich or to be on the safe side maybe a 14:1. the only thing you need to use one is the fmu itself. last time i checked, which was 2 years ago, they run for like $100 new or like 60-80 used. you connect one end of the Fuel Management Unit to a vacuum source, theres a line in for fuel and a line out for fuel. you may also need a fuel regulator is you plan on running a lot of boost.

do note that an FMU might be the most unreliable object you can use to increase fuel rates and shouldnt be trusted when running more than a bar of pressure.

to find them just search google for FMU

 

[bizoneoeh]

I know for a fact that there's a thread on here with a dpfi turbo, you just have to search for it. If I remember correctly, the guy added 2 extra injectors to it. The thread originally came from homemadeturbo.com so you might want to search there.



Another ting you might think about doing is just swapping those internals over to a mpfi motor but I don't think you want to do that, right?

 

[bizoneoeh]

I found the thread but the link to the hmt thread is dead. There's pics but it was explained well on the original thread on hmt.com


http://www.clubcivic.com/board/showthread.php?t=69494&highlight=dpfi+turbo

 

[ornge04gt]

yea im not looking to switch the internals. way to much trouble. So would a 12:1 fmu work with 5 psi i geuss? from what i been reading 5 sounds like the max. And can someone tell me how a fmu hooks up. I read about it and know how it works, but were do the ports go?

 

[jason_guy_yeah]

Try using a AFC with a Wideband. You'll b able to tune by rpm range and a/f.

 

[ornge04gt]

Try using a AFC with a Wideband. You'll b able to tune by rpm range and a/f.

Can you describe what an AFC would do? this is were im stumped so i pretty much no zero stuff about this. Sorry for sounding like a pest.

 

[EF Kid]

the dpfi is horrible for turbo, you should seriously just swap intake manifolds and run the few wires needed. you could then boost what ever you want and even get some bigger injectors(4 of em). the duel point just doesnt supply enough fuel to even think about boosting. If its a race car you should make it fast.

 

[ornge04gt]

yea i would but i cant swap manifolds because i welded the ports for the injectors on the head and grinded it smooth so it would flow better with the dpfi manifold.

 

[bizoneoeh]

yea i would but i cant swap manifolds because i welded the ports for the injectors on the head and grinded it smooth so it would flow better with the dpfi manifold.

so just use a different head



all that money put into it will go down the drain if you stay dpfi. If you want to go turbo or high compresion ALL MOTOR you need fuel. You're not going to get the fuel you need with only 2 injectors. I know that's not what you want to hear but that's the way it is. Like I said before, the guy that did do the dpfi turbo added 2 more injectors but how and where he did it, I don't know. It's less work to turn it into a mpfi setup.

 

[ornge04gt]

Will 5psi and a 12:1 FMU work though? without blowing up?

 

[bizoneoeh]

Will 5psi and a 12:1 FMU work though? without blowing up?

I don't think so dude, you still need the extra fuel to get into the motor and without the 2 extra injectors, that's not going to happen. A stock head will work fine and you can probably get one for cheap. s**t, I had an extra si head and I just gave it away not too long ago.




but hey, I can always be proven wrong

 

[ornge04gt]

well i geuss if i wanna race do it right. So my plans are to pull the head back off and grind out the notches for the injectors and do a mpfi swap.

 

[bizoneoeh]

well i geuss if i wanna race do it right. So my plans are to pull the head back off and grind out the notches for the injectors and do a mpfi swap.

you won't be disappointed

 

[EF Kid]

you will max those duel point injectors out so fast. those motors are ment for gas milage

 

[stealthy]

honestly, you screwed up in the beginning when you decided to do a full turbo build on a d15b2 of all motors, not to mention keeping it dpfi....they are good for nothing but good gas milage. how much do you have invested in this project, and what are your goals with this motor/car

 

[jason_guy_yeah]

AFC (air fuel control), it alters fuel preasure by rpm range and programmed settings.

 

[ornge04gt]

Ok i got a turbo kit, and im grinding my head back out for the mpfi swap. So after that all said and done. What do i need to do to tune it and such?