TBI IS EFI
MPI is EFI
A throttle body is just a block of aluminum with an air valve.
EFI TBI is a complex ECU System.
look at our TBI and MPI note only 3 missing injectors., and all else the same.!
And all tuning is quite unique in the 2. ( 8v and 16v ) .
OIL ,OMG dont say oil or the witch hunt starts..... LOL !!!
actually all crank case oils are ment to be burnt.
the only issues is ,how fast. ( 2 stoke oil a classic case)
all motors let oil slide up past the ring (oil control ring ) then into the top 2 rings.
where it then burns.
must be something about the designed of the apex seal. not liking syn oil. (i dont know)
the other problem there is , that there are oils that are syn oil and not labled as such.
syn oil can be mfg 2 ways.
long chain reduction (dino to syn) ( hydrocracking)
short chain to long (add hyrdogen)
the results can be and are the same. ( huge law suit for that; proved that)
The details about these facts are at Chevron.com, all the details.
many oils , the only difference it he additives in the oil , can be big differences.
The TBI has 1 or 2 injectors.
the reason for 2 is if the main injector cant handle idle ( main becomes non linear at low end)
forget idle. lets talk off idle where all the fun happens....
the main injector needs the same fuel controls as a mpi 4 injection system.
with all the other sensors. ( i just made one with a MS V2 megasquirt TBI)
the whole process is the same for TBI and MPI but one step. ( done automatically
in the equations,) Most cheap ECU MPI systems just do gang injection
so are no better than TBI save he close proxemity to the valves. (intake)
Biggest difference is the smaller injectors. on MPI and coding that in.
TBI an MPI
all have fuel table
Spark Advance tables
and seperate ,cold ,warm and hot tables.
all must be programmed and tuned a dyno.
or buy a PNP kit that has it already done for you.
A TBI is not a carb, nor is it more near a carb, not at all, not even close.
but sure TBI is physical work less work than 4 injector pockets. and sure totally the way to go on a rotary.
You have 3 choices (systems) TBI,MPI or N-Alpha ( aside from carbs)
Dont get me wrong there are -ALPHA systems that have only 2 parts.
a TPS and a TBI , a black box , to control the injector.
it is real crude and will blow a motor fast.
and really dirty at low RPM, black exhaust clouds dirty.
there are race cars that use this system, that never ever go under WOT.
in this case they work ( one AFR , WOT and RPM?TPS based) no map, no maf, no nuttn
or other fast track cars can have this. and a closely guarded secret by the users.
there are huge sections over at MS forum for this usage.
read about this crude injection form here.
Electronic Fuel Injection Mass Flow vs. Speed Density- Car Craft Magazine