| The high octane map is the map used for reference during normal driving conditions. This is also referred to as the low detonation map. At low or no detonation this map is used to curve the A/F ratio and will be used in most normal conditions until the knock limit table's high end has been reached where the knock limit table then tells the program to start using the low octane (or secondary) map. The low octane (secondary) map will be referenced under higher than normal detonations and referenced in accordance with the knock limit table. Like SeanK said, the maps are for a normal and safe mode. They are are used to curve the A/F ratio under loads and knocks. These are the maps you tune in accordance with the timing maps to provide proper mixtures of air and fuel under load conditions. You can only really tune these maps (fuel and timing) under real load conditions such as on a dyno machine. Anything else would be pure guesswork. JWT tunes these maps to be used in different vehicles concentrating on air and fuel delivery systems as the only factor. As long as vehicles use similar setups for air and fuel delivery a standard set of maps can be used. When you start adding things other than larger injectors and air intake systems (IE larger turbos, higher boost, faster flowing exhaust) these maps need to be retuned under real load conditions to provide you with maximum efficiency although you can still use the tunes JWT provides and be safe. I recommend sticking with JWT tunes unless the tuner tuning your car has a very good grasp on how to tune properly and does it under real load conditions. One other thing. The big debate on JWT's maps not being so safe because they use the same primary and secondary maps. If you notice, even the stock primary and secondary maps are almost the same. Leaving them unchanged is not the biggest factor in tuning. If you are concentrating on and only messing with these maps then you are wrong. There are much more things involved in tuning than this. Ash claims his tunes start from scratch from a stock chip. Thats BS. There is no way you could perfect something like that in a short amount of time on a dyno. If you take a look at Ash's 850 tune he used in WagZ Z during his 744.7 hp pull you can see that the secondary timing map is exactly the same as JWT's secondary timing map. How could anyone tune this map to the exact same values as JWT's map when this map is not even accessed unless you were under high knock levels? Everyone has to start tuning from somewhere and it's obvious Ash used an 850 JWT tune to start with for this tune. Anyway, I'm not trying to start another Ash debate. I'm just showing what things look like to help people get an idea of how things work. Tuning is a fine art that takes the proper equipment, time, knowledge and dedication.
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