I did this swap to a c+l 24 lb mass air and a9l, and sotp was better, throttle response was better, and if you tapped the throttle, there was no delay like factory. the engine reved as you hit the gas not after you hit and released it....I was happier with the a9l than the x3z in mine for sure
more than likely you guys that felt a SOP improvement felt it due to the MAF swap and the not the A9L swap. There are only a few differences between the 2 processors
What about the timing retard above 92MPH and on shifts?
The Cobras had much softer timing tables, switch to an A9L. I did so on my 347 car. Back in the day people were picking up 3 tenths by ditching the Cobra computer.
From the files I have seen, the X3Z timing tables and A9L timing tables are not any different.
My experience with doing the A9L swap netted me no gains whatsoever on the dyno or at the track. Yeah you have a speed limiter at 92-93 mph but to be honest I don't think it does anything. I have it turned off in my car but it didn't show any improvement since mine was already modified with a cam and exhaust at the time
What about the timing retard above 92MPH and on shifts?
The Cobras had much softer timing tables, switch to an A9L. I did so on my 347 car. Back in the day people were picking up 3 tenths by ditching the Cobra computer.
I'll wager the difference was when the MAF was swapped - aftermarket MAF's typically lean the a/f out at WOT compared to stock.
I want to say there is a 1° difference in some of the timing tables. The timing retard above 92 mph made little if any difference. There was no shift retard on the 93 Cobra - I believe that started in 94, but don't quote me on that...