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Bostons335i Bostons335i is offline
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Default jb4 map selection guide for single turbo - 10-13-2021, 07:48 PM

Hey guys,

got a fast question if anyone could chime in. I just installed my single turbo kit and using map 2 for 3.5 bar sensor which is 20 psi. I was wondering if anyone knew the requirements for the maps? I know when i had the twins in order to go higher on maps octane changes were needed , was wondering if this is also true for single turbo set ups? Thanks in advanced!

JB4 Single Turbo Map Guide:

For stock and 3.5bar TMAP sensors:

Map 0: Disables JB4. Required for any flashing or OBDII diagnostics.
Map 1: Wastegate spring, throttle closure over 17psi (also safety map)
Map 2: 17psi
Map 3: 20psi
Map 4: 23psi
Map 5: 26psi (31psi with 4bar TMAP)
Map 6: User definable map
Map 7: 28psi (33psi with 4bar TMAP)
Map 8: Progressive WMI map with integrated safety adjustable from 17psi to 33psi
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Steve @ BMS/Fuel-It!'s Avatar
Steve @ BMS/Fuel-It! Steve @ BMS/Fuel-It! is offline
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Default 10-14-2021, 09:29 AM

Generally speaking...yes...more boost requires more octane.



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Bostons335i Bostons335i is offline
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Default 10-14-2021, 10:15 AM

Hey Steve thanks for the reply ! For 93 only what is a safe boost level/ max ? 20? Or 23psi?
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Default 10-14-2021, 10:52 AM

Always best to start low and work your way up if you don't know the actual quality of the fuel. I always take the octane rating with a grain of salt and its easy enough to check.



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