Default is map 1 which is shipped with from factory. It's fine for all cars and fuel but leaves a lot of power on the table. To switch from map 1 you need the optional USB cable and a laptop and you can change maps and settings with the free JB4 software. There are also apps for Android and IOS.
Map 2 and above requires that you tap the AFR wire but the included positap makes it very easy.
If you have the 7 speed DSG map 4 is a good start. It tapers off boost past 6k so launch control works as intended. If you don't use LC you can go with map 3 instead, it holds boost up top. The IS38 turbo isn't very efficient above 6k anyway so either one will be fine. If you plan on running a E85 mix you can setup a map 6 and log some runs until happy. In my opinion unless you go with E85 mix, map 3 or 4 are set and forget, given that the fuel is good enough that is. Otherwise you can drop down to map 2 which will probably give you 350-360 hp and 350-360 ft lbs or so if you have no other mods. I'd guess map 3 and 4 are around 360-370 hp.
Be sure to change the Fuel Open Loop setting from the default (60 I believe) to 45. It's also a good idea to up the Boost Safety setting a little bit (mine is set to 28 but I run a high boost map), otherwise it will automatically set the unit to map 8 if you hit the limit. I recommend going with the stable 60/86/5 firmware, I think all units ship with it.
Here is a list of the different maps:
Map 0: This is a stock map with JB4 logging ability. It is also the starter map for cars that are running flash tunes and are stacking the JB4.
Map 1: Tuned map with a average of 4.0psi over stock. This is the shipped map and is compatible for both 91 and 93 and can be used with cars on hardware.
Map 2: Tuned map with 5.0psi peak boost over stock. 93AKI/98Ron recommended
Map 3 Peak boost 6psi 93AKI/98Ron recommended
Map 4 Peak boost 6psi (Golf R and Audi S3 7speed DSG specific), it has a taper at higher rpm so will also work well for all on 93 in hot climates
Map 5 Absolute map peaking 25 tapers to 20psi. E30 with bolt ons needed. (not to be used on 1.8T or 2.0T Jetta)
Map 6: User adjustable boost map. The map comes preset with a 5.0psi over stock peak and is ready to use on any car running 93 octane. The preset map is also suitable for manual cars with clutch longevity in mind.
The mapping can be done in two manners. If the value at 1500 is kept below 10 it will work as a boost adder map. If the value at 1500 is higher than 10 it will work as a absolute map. This means actual total boost targets will need to be entered.
Map 7: Meth integration map using our FSB Meth controller
Map 8: This is a valet map/safety map where 50% of the boost is cut. It is also the starter map for cars that are running flash tunes and are stacking the JB4. It will give the ability to log the car via the JB4. This is also the safety map, so in any circumstance the JB4 detects a unsafe condition regardless of map it will default to this map. This includes knock detection, lean AFR or the boost safety value being triggered due to lack of boost control.
JB4 for Gen3 VAG Group VW/Audi Group
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