The Xcal 2 works as an awesome scan tool. With good data logs we can tune anything over the mail. You have to keep in mind we have been tuning with SCT 8 hours a day, for years as apposed to some people who have been messing around with it for months. With you sending us the data log via email, it is no different than us being there tuning your car. How can it be different??? We use the same data logger to tune the cars here on the dyno. It has replaced our high dollar fancy scan tools. The dyno allows us to tune wide open throttle conditions using the wide-band 02 sensor. Because we have tuned a bizzilion trillion Contours here, we already have good maf tables for pretty much any intake. If you take one of our mail order tuned cars to the dyno, you will notice that under wide-open conditions the air fuel is perfect. Problems arise at part throttle, part load on 1 out of a hundred cars partially due to people porting this and that which makes the MAF very upset. It is not a huge deal and can be adjusted with some good data logs.
If you have any questions or concerns please hit me up. I am glad to answer any questions
