[TwinTurboXI]

Please inform me about how the jb1 works. Does it increase the boost by tricking the car into thinking its at a higher elevation? Any info would be nice. Dynos too

[Mike@N54Tuning.com]

The JB1 is probably the most conservative of all the tunes out there. It increases boost by about 2PSI, and gains are in the range of 30-40 HP/Tq. It does not require a solenoid bypass and I believe you have to tap 2-3 wires in the ECU.

You are in essence correct on how it works. Its a very safe and mild tune, as peak boost does not go above 10PSI.

Mike

[Dan335i]

I believe it was 3 wires when i installed mine.And while its a mild tune,you will definetely feel a difference.

[TwinTurboXI]

I "might" have the tune installed on my 335xi. Otherwise the car is stock. I did a few pulls against one of my associates 335xi. His car is stock except for cat back magna flow mufflers/exhaust. At most i can pull about a car length on him. This leads me to believe the gains at most are about 15-20 hp/tq. Im sure his exaust gives him some performance boost. We swapped cars and my car feels a good bit quicker. So what gives?

[TwinTurboXI]

And you tap 2 wires...