WHY A9L EEC "only" for SD --> MAF Conversion ??
 

Why does the EEC "need" to be from JUST a A9L GT only ??

Wouldn't another EEC-IV from another application work instead ?

Why couldn't any of these (below) work ??

OEM Binaries

A9L - 89-93 5.0L Mustang 5-spd
A3M - 93 5.0L Mustang 5-spd
A3M1 - 93 5.0L Mustang 5-spd
X3Z - 93 5.0L Cobra 5-spd
A9P - 89-93 5.0L Mustang Auto
A9S - 88-93 5.0L Mustang California
C3W - 89-93 5.0L Mustang Auto
DA1 - 87 5.0L Mustang 5-spd
J4J1 - 94-95 5.0L SVT Cobra 5-spd
T4M0 - 94-95 5.0L GT Vert 5-spd
U4P0 - 94-95 5.0L GT Auto
WH40 - 94-95 5.0L GT
ZA0 - 95 Cobra R
D9S - Lincoln LSC
ZXA3
LLX3
CCA1
CCA0
AOL2
AOL3

The above info was obtained from;

-->> EEC-IV Tech info from Tom Cloud <<---

I would think that any one of them would work. Why are you converting?

MAF has better throttle response and better able to adapt to engine upgrades.

SD vs. MAF Round 1
 

uh oh! here we go!:rolleyes:

None of the 94/95 computers or the lincoln computers will work because it just dont haha dont ask me why. Ive tried and it just doesnt work. Now your better off just getting the A9L computer there the most common. You can use them in any conversion that you want to do. sometimes its better not to ask questions and just do it

SRV1- I'm not gonna do it. :)

OK..... Looks like I've stirred up the Hornet's nest here.

How about the details.

Are the fuel tables in the EEC-IV the only consideration (other than changing Pinouts ??)

I'm not buying the fact that the A9L is the ONLY EEC-IV that'll work for this conversion. As we know, they're getting harder to find and expensive when you do find one.

So WHY are they considered the BEST/ONLY EEC-IV that will work ?? I'd really like to know....

Any of them will work. Just stay in the ECM family that is for your year or body style:

A9L -- 88-93 Mustang (5-speed)
includes A9L, A3M, A3M1, D3D1, X3Z, S0Z

A9M -- 88-93 Mustang (auto)
includes A9M, A9P, C3W, C3W1

A9S -- 88-93 Mustangs (CA.)
includes A9S, 8LD

ZA0 -- 94-95 Mustang
includes T4M0, U4P0, W4H0, J4J1, ZA0

Murdock

While the 94-95 EEC processor will work there are a few differences that you should be aware of. 1st off the 94-95 EEC was designed for a new model car with some important differences in it. EEC runs a 2 speed electric fan, no big deal. The Major change had to do with Ford trying to deal with a rash of 5 speed trans failures believe it or not. So to address the problem the 94-95 EEC was set up to pull timming out of the ignition on every gear change to soften the "blow " to the trans on shifts. 2nd, timming is pulled out after reaching about 92mph to cut down on the torque load that the trans was seeing in 3-5th gears depending of rear gear ratio. Swaping in a 93 EEC into a 94-95 5.0 usually netted about a .5 sec quarter improvement. Pro-M makes a conversion kit for just such a swap, it also address the electric fan function for the 94-95 that the 93 EEC cannot provide. So I would not use a 94-95 EEc myself unless there just was no other option at the time.

Good info!

So what about 89-93 EEC-IV with Automatic Transmissions ?? Any differences there ??

Why won't the 89-93 Mark VII EEC-IVs work ???

The 94-95 computers (T4MO) will work..... but you have to re-pin the injector wires. Just look at the 87-93 pin-out and the 94-95 pin-outs to see the difference....

I know because when I initially converted my 86 to Mass-air, I only had a 95 5 spd processor. Now running the 9AL....

Teddy

Re: WHY A9L EEC "only" for SD --> MAF Conversion ??
 

Was there just a timing change on the CA computers, or was there also a wiring difference from the A9M?

Re: WHY A9L EEC "only" for SD --> MAF Conversion ??
 

Permawired Check the dates on a post before u reply, That one was from 02 or 03. But then I replied so u never know.

Re: WHY A9L EEC "only" for SD --> MAF Conversion ??
 

Sorry about that. I'm sure you know how it goes after 6 beers and 3 hours of reading online :) Long story short, I found out what I needed. I'll post how my car turns out over this next month or two. Going to be dropping in a GT40 upper and lower intake with GT40P heads (with 1.7 roller rockers on em and refurb injectors) that have been ported. I've also got a bassani X-pipe and will have the mac headers in a couple weeks. I'm interested to see how it all turns out, wish me luck.

After all the computer info I've read over the last couple weeks I'm going to just get a TwEECer to tune the comp to start...

Re: WHY A9L EEC "only" for SD --> MAF Conversion ??
 

Good deal, keep us posted, need any help let me know.