A9L Differences

I've never heard of any differences between A9L to A9L... The differences between auto and manual were pretty minimal, and from what I remember in load/rpm ranges that only the autos would use.

What is the rest of the setup?

Dyno it back to back. Or, take it to the track and watch trap speeds. Or, buy a performance meter and test it. Or, ignore all of that and just run the one you like more. Even if it's not real, perceived reality is still valuable.

Take this with a grain of salt, as it's probably a bunch of speculation, but I've read there were differences in the programming in the computers that made them more conservative over time. The programming in the 93 Cobra was supposed pretty tame. I dunno. Other people say that the tuning is the same. This guy says he looked at the fuel and timing tables that had no difference and there's only a small difference otherwise and seems to know what he's talking about:



I don't know what that fuel multiplier does, but it sounds like on acceleration it would add less fuel. I suppose a 2% leaner on the A9L can make a small difference. I don't think the seat of the pant would pick that up. That'd be like running 13.1 vs. 12.8 AFR.

I suppose it's also possible that something is wrong with one, and not the other.