Delphi mefi
 

What are differences between 4, 4A, 4B systems.


Peter

Mefi 4a , 4b
 

The MEFI 4a system from what i understand is not programable, the 4b system is. MSD Fuel injection has this with "ingenus software" and AZ speed and marine also offers a programable 4b

All 3 are programmable and are programmed in the same way. The 4B is the newest and has a few more programmable parameters than the 4A which has more than the 4. Each is just a slightly new generation than the next. The software to do any of the MEFI ECM's is at www.mefiburn.com and they will also reprogram your Ramjet MEFI for a few hundred dollars.

Old post I know but yes all the mefi systems are tunable. including 1's and with mefi burn it can be done. i personally like the 5 better