I've installed JB4 today replacing German CPA power box. After short testing I have to admin that JB4 is much better
With map0 (stock) turbo hardly pushes over 10psi.
With map1 the car pulls noticeably harder than with CPA piggy back. Map2 and Map1 both are giving me about the same results by feelings and also logs. Turbo boost peaks are hitting about 21psi.
That is impressive but much more than expected over stock setting. I have only RAL95 in the tank now.
I've noticed strange turbo sound on Map2 when hitting hard and releasing gas. It doesn't sound healthy. Maybe because of the MST cold intake kit.
I am not happy with JB4 installation instruction which is showing opposite plugs for G series and also support is not the best. But product seems to be nice so far
I am looking forward for 0-100 times and logs. I have E85 here as well so it might bring a lot of fun to my 320i with "shitty" B48C engine. Let's see if Germany can notice remotely by collecting FASTA data what I've done to turbo values.