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Originally Posted by AMS ALPHA
I dont know how the JB4 works exactly but I imagine it works based off of a stock map so putting that on top of our tune sounds like a REALLY bad idea. I will find out what boost we are running. Again the boost it runs at redline is lower than the boost it runs at peak torque as its starting to fall off.
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All the BMS does on the S63 TU is trick the Tmap sensor, its a way simpler system than the JB4 as a CAN integrated system was never developed by them for the S63 tu. Thats it so the ECU runs more boost to meet its programed target which after the signal being altered is +2 , +3 psi etc. The ECU then retards timing as needed, and adds fueling to meet its AFR targets. At aggressive settings the ECU rides the knock sensors and maxes out fueling and you need race gas or meth to make up for it. A very bad idea when you have a real tune, but I'm sure someone will do it lol .