Originally Posted by 1speedbike
Well, the JB+ plugs directly into the TMAP sensor. It plays with what the car "thinks" its current altitude is, which then would modify the calculated air density and what the car sets the fuel metering and boost targets to (if I'm remembering correctly). Since it's doing the same thing in the 1M, I'd think that it would work. What is the stock boost for the 1M? Something like 9 psi and then 12 with overboost? The JB+ adds up to 4 or 5 psi (at 50% its +2.75 psi) usable all the time. I don't see why it wouldn't work, especially since the JB4 works, unmodified, on a 1M. But I could be wrong.
I think I saw literature with boost close to 12 (0.8 bar) without the overboost and I think with was 1 bar which is 14.5psi.