Originally Posted by
tobibeck80
stock they can be chipped to ~360 PS, thats what a Munich BMW engineer told my brother during a service technician training.
some German Tuners (Hartge, AC Schnitzer, Hamann etc) tuned the N54 engines to over 400-420 PS without changing the whole internals, I think only one of them put some other pistons in it, all the others just went with an ECU reflash, other injectors and exhaust and mabye some better gaskets.
I have to check my magazines, I got one with 4 different 135s in it, just dont know where it is lol
fyi, the new versions of the N54 engines are going to get a single turbo setup
The new generation of that engine is already for sale (we already have an 135i convertible with it in the shop right now).
Single-Turbo Setup with Twin-Scroll Turbo->respond like 2 smaller Turboīs, power output like a big one.
The older Twin-Turbos are engineered to stand ~360PS, but for some reasons i donīt know BMW put them on sale with much less power.
BMW offers a Power-Package which adds 20PS.
It includes an ECU remap, improved cooling and so on, for 2000.
And with warranty, of course.
Alpina (re-)boosted this engine up to 360PS in the Alpina B3, but with other internals as well for longer durabilty.
But now Alpina brings the B3 S, which produces 400PS and
540Nm of torques (398 lbf ft).
They just raised the boost from 1.1 to 1.2bar, replaced the catalytic converters to reduce dynamic pressure and improved the air-intake-system.
Canīt wait to drive one of these.
