Can the 3.9 CFI be saved? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
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post #1 of 20 (permalink) Old 12-17-04, 05:59 AM Thread Starter
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Can the 3.9 CFI be saved?

I really dont feel like switching to MPFI but I was wondering if there would be any inexpensive upgrades I could do to tune up and enhance my motor?
I already got extractors fitted and a K&N air filter.

Any other cheap methods somebody could recommend?

Thanks!

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post #2 of 20 (permalink) Old 12-17-04, 06:31 AM
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Re: Can the 3.9 CFI be saved?

plenty of cheap mods. rarely will any of them yield noticible results. do the mpfi, it will be cheaper and more effective than 10 little mods.

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post #3 of 20 (permalink) Old 12-17-04, 03:21 PM
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Re: Can the 3.9 CFI be saved?

The MPFI setup is the best and one of the cheapest mods you can do to a CFI engine.
Don't bother with anything until you've done it.

Rick.

4L I6, naturally aspirated producing 173.5rwkw.
14.410 @ 96.49mph with street radials.
What's that?..... Did I hear you say TQE power?
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post #4 of 20 (permalink) Old 12-17-04, 04:20 PM
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Re: Can the 3.9 CFI be saved?

MPFI is the single most effective mod, and one of the cheapest...

I've converted mine and while the car still isn't a rocket, the difference from CFI to MPFI is absolutely phenomenal.

Rosewood EAII Fairmont 02/90. MPFI 3.9L (formerly CFI), 4spd BTR Auto. Skyline geared 3.45g open center 28 spline 4 pinion differential & axles. 2 1/2" Cat Back Exhaust. King Super Low Springs. Sound: Equalization and amplification by Clarion; Head unit by Sony, Front, Rears and Sub by Pioneer. Planned mods - t5, Extractors, Painting Grey Strips and new front and rear bar.
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post #5 of 20 (permalink) Old 12-17-04, 07:38 PM
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Re: Can the 3.9 CFI be saved?

Look at it this way, EAXR6 had a worked CFI EA that pulled 115rwkw. Pretty impressive for a CFI, had a very lumpy cam, headwork, extractors + zorst, chiptorque chip, etc etc. Now a stock MPFI EA will pull around the 95-100rwkw mark, which means that it only gained 15-20rwkw from all these mods. He then switched to MPFI and is now make 150rkw+ simply from the conversion.

See where i'm getting at??

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post #6 of 20 (permalink) Old 12-17-04, 07:50 PM
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Re: Can the 3.9 CFI be saved?

CFi just doesnt have the flow.............. probly gave the taxi's better gas economy when they were new

MPI all the way
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post #7 of 20 (permalink) Old 12-17-04, 10:35 PM
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Re: Can the 3.9 CFI be saved?

If it's automatic and you would consider putting up with a T5, that and a better diff would bring the most benefit. For the motor itself, MPI would be the only way to go as others have said.

Jack Travis, E-Series Acting President

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post #8 of 20 (permalink) Old 12-17-04, 10:37 PM
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Re: Can the 3.9 CFI be saved?

Ok I am hijacking this thread!

I am curious (and questioning as always!)... how much does it cost approx to convert? What is involved? Is it a mechanic's job? Where do I source parts from?

ATM my EA is going through a crap idle stage, don't know what the issue is. Just had a thought (DOH!) I should check if it idles lumpier on lpg or petrol. If it is smooth on petrol, it's an LPG issue. If it idles crap on both then there's something else.

Thanks!

Bindi

EA 88
Corolla 88
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post #9 of 20 (permalink) Old 12-17-04, 10:39 PM
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Re: Can the 3.9 CFI be saved?

do a search on CFI MPI conversion

its been discussed about, oh 100 times. Everything you need to know is here.

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post #10 of 20 (permalink) Old 12-18-04, 12:19 AM
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Re: Can the 3.9 CFI be saved?

[QUOTE=Rmyers]Look at it this way, EAXR6 had a worked CFI EA that pulled 115rwkw.

what the hell is an eaxr6, xr's didn't come till '93
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