Josh94gt said:
Well no one answered the question about the computer being better. Yeah the older computer had a slightly better tune; they mellowed out the 94-95 computers slightly. But it's not THAT big a difference. Even if you dyno-tune a stock mustang ur not talking about a huge hp increase, just a little bit. I agree with killer that it's totally more worth it to get a dyno tune. But I would think something is wrong with ur engine to only get 233hp. Maybe check the dist. timing or something? I dunno. But good luck figuring it out.
I'll answer your question based on my experience with my car.
The pcm in the fox bodys are not better, just different.
For example, the A9L gets some of it's info based on rpm where the T4M0 uses load based info.
Most tuners are very familiar with the A9L's cause they have been around for so long.
Don't think you can't turn up the fuel & spark knobs for full kill with the T4M0 or J4J1 like you can with the A9L. You can *** You just do it differently.
I do not claim to know everything about the 94-95 pcm but I do have a basic working knowledge of it that I picked up from various sites.
I put that basic knowledge to work with a Tweecer and was able to take control of the tune for my car and replaced the 94-95 GT program with the 94-95 Cobra program and I got what I think have been good results.
As for retro fitting the A9L, I think, I'm not sure, but, don't you have to also get a MSD box or something extra in addition to all the other stuff to make the conversion? You still have what you started out with, a stock pcm that you can't make tuning adjustments on.
Hey, I'm not saying putting the A9L in our cars won't make more power.
But for me, I did not mind investing some time in learning the basics about our pcm and I put the money toward a tuning device instead of a different pcm and its supporting hardware.
Later
Grady