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How do revisions and revisions numbers work?

Revisions are what we do as a tune is updated. Every time an update is applied to a tuning map, the revision number increases by one. It is a way of keeping track of the changes and organizing the changes systematically. You may wonder what we mean by revision numbers in our tuning packages. The main point to understand is that they do not limit your tune, instead they are a minimum guarantee for your benefit.

Think of revisions like "free" re-tunes. At E-Tunez we know tuning is an ongoing process that is as good as the time you spent on it. This means tuning is not something that is ever finished 100%, the more time you spend on it the higher quality the tune becomes. Since we want to ensure you get the highest quality of tune we gauruntee to re-tune your vehicle until completed, and also use revisions to set a minimum number of tunes you will recieve. These revisions, are generally done back to back, one per day at least but the schedule is ultimately up to the user.
When we create you a map, we base it on the datalogs your provide us with, and as tuning is a law of averages the more datalogs we see the better "averaged" your tune will be. The revision number lets you know how many re-tunes in total you will receive at a minimum. If theres still a problem with your tune, we keep going, but the revisions are there to ensure a minimum, as well as better averaging.
This means your car will be running near perfect and well averaged for all conditions and not just WOT. Revisions is not something the industry is very receptive of. When you go to tune your car at a dyno shop, it may be running good that day, but what about the next? If the shop let you come back for re-tunes every time the weather changed the dyno equipment would be broken, long before the shop broke even on its investment. It is very crucial to understand that the portions of the map being used to regulated the car, change as the environment the car is being run in changes. 
This means for better averaging, we re-tune you car a number of time to make sure we got it right. While for a average tune we are very close to ideal in just a few revisions, some customers with custom work are running tunes with revisions in the 10-20 range just to make sure things are as near perfect as possible. We keeping tuning until complete, which is the point when environmental changes are having a larger affect then the updates we are making in a tune, (around 1-2% adjustments). Sometimes this can happen before we meet your minimum revisions, so that means you now have extra revisions to use at your convience.
Our Ultimate Tune as this is a great way to ensure the car is completely tuned, as we essentially will keep working on the tune as often as your provide datalogs. Some of the higher revision numbers tunes are a work of digital art, as the car will run near very close low STFT's in almost every condition, with flat line AFR's and smooth transitions for all fuel maps and cam angles all while providing increased fuel mileage. Because tuning is about efficiency with the cylinders and displacement you have and fuel limits inherent within those boundaries, this also means that making your car perform more efficiently often results in better fuel mileage too.

Its important to know that all tunes sold by E-tunez are tuned until they completely meet the criteria laid out in the tune type that was purchased, regardless of the revision count. In other words all of our tunes are tuned until they are complete. If a user purchased an Ultimate Tune with 7 revisions and the tune was not complete by the 7th revision, the tuning process would continue until the point it was, no matter the revision count, and no matter which tune type was purchased.
The revisions that come with the tunes are guaranteed minimum number. So if the tune is completed before reaching the minimum revisions (say it was completed at revision 5). Then that user has an extra two revisions that can be used at anytime in the future, even if modifications change, until they reach the minimum 7 revisions promised.
Think of unused revisions as free re-tunes, its a way of guaranteeing you get your monies worth. If your tune is completed earlier then expected then you still have revisions left that can be used for IAT compensation tuning in weather extremes or even modification re-tuning or as desired by you in the future, liking adding an intake or exhaust.
Many users come back months down the road to use up another revision just to dial things back in as the parts break in, even though their tune was completed earlier. Revisions make it easier to track these changes and allow you to get more for your money. The tune is not complete, until you recieve and email saying "Final Revision" and of course the tune would be looking near perfect at the point, some of the previous revision might suggest only need one log, or similar.
If a vehicle was tuned until complete, and then the user adds a few performance parts down the road (like headers, exhaust etc) then we offer a discounted tune called a Re-Tune for this situation, again it is tuned until complete.