"The N55 in the F22 M235i has three enhancements over the normal N55.
1. Software update
2. Revised camshaft
3. Revised exhaust"
- The Internet
Also, the ECU is different. E series can be flashed via MHD. F series requires a one time unlock and then can be flashed with bootmod3.
That is the pdf for the n55 in the e-series.
I'm sure bmw Academy (where the pdfs were sourced from) has since produced another n55 pdf for the F series that outlines the engineering improvements over the outgoing e-series n55.
There are probably many more technical differences between the engines. Just like how people think n54 and n55 are the same engine yet they are technically 2 completely different animals.
Close"The N55 in the F22 M235i has three enhancements over the normal N55.
1. Software update
2. Revised camshaft
3. Revised exhaust"
- The Internet
Also, the ECU is different. E series can be flashed via MHD. F series requires a one time unlock and then can be flashed with bootmod3.