Mustang dynos and newer Dynojet dynos can put a load on the rollers that is greater than that which the car will see on the street. So you can set it for the proper weight and get pretty close.
I've seen a couple things in this thread that I would like to bring up for discsussion, comments or whatever.
Bob was quick to say that the tuning device does not blow up motors. That is correct and it points out the fact that the tuner behind the device has to be careful. Any device that gives you total control over spark & fuel can cause motor damage.
The other thing is it seems to be that the A9L pcm is thought to be good and the T4MO, J4J1 (94-95 GT & Cobra pcm) is thought to be bad. This is just not true. The 94-95 pcm in the hands of somebody who understands them can do all and more than the A9L. Both pcm's can be made to work great with various combos but each pcm works from it's own strategy and requires a different tuning method.
Interesting thread and I hope to learn a few things from the rest of you!
you are right, its not quite a few, i stated that wrong. but I have seen several cases of people who run a pms, and their motors pop due to an unexplained spike in a/f, but all of them are boosted. with a proper tune and a wideband o2 several people have seen the same spike in a/f at the same rpm. I have also heard that the newer ones are improved over the old ones. but again yes i did misstate
I went 11.50s on a stock J4J1 processor...they work great.
As for the lean spike with the PMS...we have seen rich spikes over the years but no lean spikes. We have seen tip-in lean spikes...but that can be easily cured with the Accel Tables in the PMS.