You should order 1.3 bar. It’s target boost is not the only thing you should consider, if you’re running E30, something special will happen.
Take normal pumpgas ign table (after adaptation) as example, it’s like 12.5deg after shift to 17.5deg before upshift for earlier gears. Once you dump E30 mix into your tank, it will be like 15deg to 20deg, which is fairly aggressive. At this point your E30 might have problem to provide enough octane for 1.5 bar, which might lead to a funny situation that the log of your E30 mix is as crappy as your pump 93 simply because E30 triggers more timing.
Second benefit of 1.3 bar is how tunable it is with map6, if your E30 is good enough for more boost. 1.5 bar tapers from 21.x psi to 17psi before shift which leaves lots of power on the table. Considering how JB4 works, adding boost to only 5500rpm and higher is buggy basically impossible (it will trigger a higher boost spike after shift at untouched rpms). However, 1.3 bar might allow you too add boost across to all rpms to prevent this bug. Pearly and I have be trying to figure this out for years and all my failures will map6+1.5 bar and all his success with map6+1.2/1.3/1.4bar can back this up.
