[olddog]

I should add there is a lot of self tuning EFI advertising. In my opinion, it is all marketing and a few tid bits of truth sprinkled in.

At best these aftermarket self tuning EFI can be used to help you get a decent tune, although not necessary. A bunch of hype over something that always existed.

The factory CPUs all use correction tables of some type. They all self tune. They can usually correct the fuel up to +/-20% some more than that.

When you get all your fuel tables set correctly and then turn on the correction, you should see numbers very close to 0 in the correction tables. Letting it auto tune while you are trying to tune is like too many cooks in the kitchen.

To the best of my knowledge the only thing these auto tuning systems tune is the fuel. You still have to set the timing tables for your engine. The time is where all the power is at. Also you may need to run richer at WOT to keep some engines from going into detonation. I do not believe auto-tune is going to address any of this. All it is going to do is get the O2 sensor to read the commanded AFR.

So this all said do not let this self tuning hype sway you.