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Old 09-08-2003, 05:40   #1 (permalink)
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cfi to mpfi...is it possible

Hi Guys, great forum

Ok I have an EA 3.9 WAGON, stock as bags, new eng recently fitted and was wondering about the benefits of MPFI over CFI. I assume there would be some increase in power as well as being more efficient.

Firstly is this assumption true?

What would I need to do the conversion?, I again assume (a) manifold
(b) computer box
(c) air filter assy
(d) additional wiring harness
(e) Other stuff?

Any thoughts and advice greatly appreciated on this feasibilty study

Many thanks


Glen
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Old 09-08-2003, 06:22   #2 (permalink)
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CFI to MPFI

The EBII/ED MPFI bits should not be hard to come by these days.

Yes, you will need the items you listed.
You will need the whole engine loom and matching EECIV from an ED/EBII along with the manifold, aircleaner, etc.

Another alternative is to install the EL manifold. This would deliver a better gain than the EBII/ED and be better value-for-money versus effort involved.
The EL used a distributer so the conversion is not more complex than to an EBII/ED MPFI.
The EL manifold will deliver better low end torque than the EBII/ED MPFI and slightly better top end performance. (The EF and EL manifolds are the same but the EECs are different as the EL uses a dizzie).

I am currently planning to go from ED MPFI to EL intake manifold. I will be "tacking" the extra EL wiring (knock sensor, vac control for the butterflies, thermofan control, etc) into the existing ED loom in my case.
I picked up the manifold, vac switch and loom for $100 a few weeks ago (no throttle body or injectors).
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Old 09-08-2003, 16:45   #3 (permalink)
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G'day Muzza,

Many thanks for that.

An EL manifold hey? Did'nt think of that, what a good idea!

Now can I assume that I would get all the mpfi gear I need from an EB, but the manifold and injector rails from an EL?

Amother quickie,......... the dizzie, Iknow it has to be changed because someone told me to, but what is the fundamental difference between the cfi and the mpfi one?

I have read elsewhere that I'll need the following:

MPFI intake manifold (includes injectors, fuel rail & regulator)
- Injector wiring loom
- Throttle body (should come with manifold) & ISC solenoid
- A/C compressor bracket and retaining bolts
- MPFI dizzy
- Intake gasket
- Throttle cable
- Air cleaner housing and intake pipe
- MPFI MAP sensor
- 3.9L MPFI ECU
- MPFI wiring loom OR Re-wire existing loom
- MPFI fuel pump
- A meter or so of vacuum piping
- Dipstick extension


Oh wow, my wrecker is really going to rub his hands together, maybe cheaper to go and buy a wreck from the auctions!

Anyway Muzza, many thanks for tour help, let me know how you go with your little project

cheers

Glenn
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Old 09-08-2003, 16:54   #4 (permalink)
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Re: cfi to mpfi...is it possible

check out the eseries section for info on the MPFI conversion, there is parts lists and other stuff available there.
some say you should be paying about $250 for the parts.
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Old 09-08-2003, 17:06   #5 (permalink)
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Re: cfi to mpfi...is it possible

Map sensors are the same, leave the cfi one. The difference between the MPI dizzy and CFI is that the CFI has 6 equal lenght vanes to provide the PIP signal. Since the injectors are common to all cylinders it oesnt need to know when #1 is TDC. MPI has a smaller reference vane so the ecu can determine when to fire the 2 banks of injectors. The CFI one can be modified by removing the dowel in the drive gear and pullng the shaft out and filing down the appropriate vane.


If you go for an EL manifold just make sure that the metal pipe from the water pump that supplies the heater will clear the manifold. EF and EL ones are different but you might get away with it.

Don't change your loom. Waste of time really when it take at tops 30 mins to change the wiring. Use any MPI 3.9 ecu. So anything from EA - EB1. Dont use a 4.0 auto.
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Old 09-08-2003, 20:31   #6 (permalink)
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Many Thanks NZ, Muzza and EFFalcon, truly appreciate your assistance

Cheers

Glenn
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Old 09-10-2003, 04:42   #7 (permalink)
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Re: Re: cfi to mpfi...is it possible

Quote:
Originally Posted by NZ
Dont use a 4.0 auto.

why not?
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Old 09-10-2003, 05:56   #8 (permalink)
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Re: cfi to mpfi...is it possible

because it's a 3.9L engine not a 4.0L?
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Old 09-10-2003, 06:14   #9 (permalink)
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Re: cfi to mpfi...is it possible

well they have integrated tranmission computers where the 3.9 had it seperate. It causes running problems because there is no trans for it to talk to.
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Old 09-10-2003, 07:47   #10 (permalink)
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Re: cfi to mpfi...is it possible

sounds good enough to me. i didnt read it properly - blonde moment sorry
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