It's amazing how many people confuse injection with engine bay clutter! The only parts relevant to the injection system are the throttle body (about the same size as a carb), the ecu (relocate it if you're so fussy) and a few sensors (big deal!). The rest of the clutter that you see in later model Minis is the servo and on the MPi the relocated radiator which allows it to be more efficient.
When it comes to tuning, injection systems are much simpler than carbs, it's only scary territory if you're not familiar with them. Unlike using a carb, with injection the fuelling and ignition can be set for every eventuality of engine speed, load, air temp, coolant temp and even barometric pressure. Try doing that with a carb. That's why injection cars are more powerful, have more torque, better economy, and start every time. Yes carbs have character, but that's because they have quirks, quirks that are solved/ironed out when using injection. There's a good reason why Jenvey make a range of "heritage" throttle bodies to imitate DCOE carbs but enable injection to be used.
Unfortunately when it comes to the Mini the SPi injection was an early attempt and many injection systems of that era can appear over complex and tricky to set up, the MPi is a much simpler system and fundamentally the same as most modern systems. If I wasn't so unsure as to whether my JDM has some dependence on the ecu for the air-con, I'd convert the SPi setup to the twin injector MPi setup.
If you want to see clutter ... try working on a late model JDM Mini!!!
Edited by Bobbins, 26 May 2019 - 08:49 AM.
