fuel injection conversion
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Elder User
Joined: May 2005
Posts: 581
Likes: 1
From: Montana
fuel injection conversion
FWIW-- I have a good friend that i deal with (drink beer) that is a mechanic and his brother owns a pro racing shop in Arizona. anyway i was yakkin one night about trying to convert my crate 390 to fuel injection. short story. cost about 3000 to purchase the stuff. anyway the pro shop guy said that they had tried it on two different engines. one chevy and one ford. dont know what years and he said that they ended up putting about 7000 into them before it was said and done. both were failures. he said that if you are rebuilding your engine make sure it has the right pistons, roller lifters and all the compatable stuff that goes with fuel injection or it wont work. take this with a grain of salt as i know nothing about the process that they went through to do this change over. so much for that. Dutch
Posting Guru
Joined: Jul 2003
Posts: 2,222
Likes: 1
From: East Central Florida
Actually the speed density logic systems are equipment specific. They require the ROM to be written for the specifics of engines they're used on. 
However later FoMoCo EEC IV, MAFS, & MAFS/TP EFI's, in OBD-I or OBD-II systems do not need that data in their ROM since they're "smart" systems using PROM chips.
SD Systems fail when variables appear, while MAFS compensate as variables appear. With speed desnity there are few /no variables' allowed. With mass air there are countless and infinite variables available & allowed within very broad criteria, of course.
With use, these later, better systems, adapt using KAM or Keep alive memory ability to write code that will optimize the EFI's basic program, to suit demands placed on it. This explaination is oversimplified but it is basically what's happening between Speed Density (SD) logic and Mass Air Flow Sensed (MAFS) logic of newer, better, systems.
Having said that,The lesson clearly is people who have limited or no knowledge of EFI Systems & their complexities are way better off leaving them alone, or getting a tech that has that knowledge, or learning & mastering the knowledge themself before they venture into the field.
Again this explanation is simplified & is opinion based on my own experiences. For a really comprehensive dialogue go to the EFI Forums. I have seen 392 MoPaR Red RAm Hemis & Flathead Fords running quite well on EEC-IV MAFS/TPI fuel injection systems.
FBp
However later FoMoCo EEC IV, MAFS, & MAFS/TP EFI's, in OBD-I or OBD-II systems do not need that data in their ROM since they're "smart" systems using PROM chips.
SD Systems fail when variables appear, while MAFS compensate as variables appear. With speed desnity there are few /no variables' allowed. With mass air there are countless and infinite variables available & allowed within very broad criteria, of course.
With use, these later, better systems, adapt using KAM or Keep alive memory ability to write code that will optimize the EFI's basic program, to suit demands placed on it. This explaination is oversimplified but it is basically what's happening between Speed Density (SD) logic and Mass Air Flow Sensed (MAFS) logic of newer, better, systems.
Having said that,The lesson clearly is people who have limited or no knowledge of EFI Systems & their complexities are way better off leaving them alone, or getting a tech that has that knowledge, or learning & mastering the knowledge themself before they venture into the field.
Again this explanation is simplified & is opinion based on my own experiences. For a really comprehensive dialogue go to the EFI Forums. I have seen 392 MoPaR Red RAm Hemis & Flathead Fords running quite well on EEC-IV MAFS/TPI fuel injection systems.
FBp
