best computer for '94 GT

You covered it - I was going to joke that the best computer is one that is connected to a TwEECer.

The PIH convo can be done but it can be expensive (I would rather learn TwEECer talk and use the superior SN puter than using an A9L fox puter).......

FWIW, the puter does not override your timing adjustments. The puter still advances the timing XX degrees in a given situation. The difference is that let's say:

The puter knows to advance the timing 20* when ABC happens, giving you total timing of 38*. If you lower your base timing, the SPOUT-in timing should go down about that amount as well. So if you drop SPOUT out timing 5*, the total timing above would be 33*. In other words, you are doing a phase-shift on timing across the board.

It just sucks that one has to do this stuff backwards like that. The part throttle timing is what is through the roof AFAICT (Professor Grady knows best on that stuff).

No help from me. Have you tried locked out timing?

Good luck.

The best pcm for your car is the one in it (T4MO). Although some might say the J4J1 is better...a lot of people use its setting as a baseline tune. Technology keeps improving. The T4MO and the J4J1 are faster and more accurate than an A9L. This accuracy makes is more sensitive to changes. However, there is always the twEECer/PMS and dynotune (chip) route. IMO converting to an A9L is going backwards. More mods can be done w/o a tune with an A9L b/c its less sensitive/accurate to changes. Carb cars are easier to mod than f/i. But are carb cars more fuel efficient? That's why there are no more mass produced carb cars. You only see carbs in all out racing cars.

Guys

I'm not gonna say the same things others in this thread have said and ...... I bet by now ...... its gotta be over a hundred other posts in various threads have said about using the older Fox A9L retro-fit pcm in our cars.

Here is one thing you might want to consider that is not often talked about when you put the older Fox pcm in our cars.

The act is used by lots of things in the pcm file to get a reference for making changes in spark, fuel, and the like.

We all know the Fox has the act in the intake and its in the intake pipe of our cars.

It don't take a Rocket Scientist to figure out that the temps are gonna be hotter in the Fox than in our cars. If you compare the two pcm files you see that Ford set up the Fox pcm file to deal with those hotter temps and in turn, they set up the pcm file in our car to deal with the cooler temps.

What kind of things do you think are gonna happen when you have a Fox pcm in our car that is using the act to determine how to add or remove fuel/spark but yet the temps that the act is reporting to that Fox pcm are much cooler due to where the act is installed in our cars.

I'll only say it like this ...... That kind of logic to me seems ...... HOSED

Grady

True Grady. As I recall, fox guys who do Explor-aneer swaps run into the same ACT location issues......

Agreed!

I also found out something else that may sway his decision. Once you convert to the A9L you won't be able to get diagnostic codes.

WCstang said:

thanks for all the info.
i guess and a9l is a bad choice
so if i kept my stock computer how could i get rid of the timing issues and make it a more aggressive computer.
is tweecer the best way to go?
what about a 94-95 cobra computer?

Click to expand...

The A9L is a bad choice for your car not a bad computer (just to b clear). The timing issues as well as spark & fuel can be adjusted with either the twEECer/PMS or a custom chip. If you get a twEECer you can flash the cobra settings into a bin file thereby making your T4MO a J4J1. When twEECer is off, the pcm is back to the stock T4MO tune.

HISSIN50 said:

True Grady. As I recall, fox guys who do Explor-aneer swaps run into the same ACT location issues......

Click to expand...

Now that is the logical thing to do JT Good point Mr. Wizard

BUT

What if you're one of those peeps who doesn't run an oem Ford intake.

You ain't gonna have a pre drilled & tapped hole for that act in the lower.

I just thought about something else that could be an issue with the swap.

If there is a difference between the acts ...... it might be a good idea to get yourself a Fox act if you do the retro-fit thing. That way you won't always be wondering if there is a miss-match of that part.

Grady

If you think the tweecer is too advanced, i recommend the PMS system. I still recommend it even if you are thinking about a tweecer I love mine and it isnt even the 04 version. The 04 is even better and easier to use.