the jump in gas prices has got me thinking about EFI again i have 2 manifolds and a trottle body i can use i just need the electitronics and injectors. if i choose to go this route would i need to change my stock exhaust heads?
no you can keep your stock exhast. you will just need to put o2 sensor bung into the pipes coming out of the manifolds.
i have manifolds and a trottle body from an H.O. stang, i can get my uncle to pick up a comupter, wire harness and injectors.....ect from the junkyard he works at.
for EEC4, yes, but you can add programmers(quarterhorse or similar), custom chips, preprogrammed chips, etc Just make sure they give you the correct application. Sometimes salvage PCM's are better just because you know what it came from. They don't just wear out, so used ones are usually as reliable as the reman's as long as they weren't damaged or faulty to begin with.
Stock manifold is no problem for the hood but you will have to modify or make a shock tower brace for the left side and you can't use the Maverick power brake booster setup. The EEC4 system replaces Duraspark with TFI4 that is PCM controlled anyway, just get the distributor with your other necessary parts and wiring harnesses. When in doubt, grab it, you can always sell it later if you don't need it.
okay cool i have an efi dist laying around some place, its a good thing i held on to all these efi parts lol, dose it matter what V8 vehicle i get the EEC4 from?
yes. ford has two types of eec 4 systems. mass air and speed density. mass air is very flexable and will work well with different cam shafts and cylinder heads. speed density is programed for the specific cam and motor specifications that its beeing used on. you can tell if a car is mass air if it has a large sensor right after the air box. this is the mass air meter. 89-93 mustangs have mass air systems. i think some t-birds and mark7 lincons and cougars had mass air also.
hate to barge in but one thing I've always been woundering... I've also been throwing around the idea of converting to efi... is a return fuel line back to the tank really necessary? I mean isn't that what the regulator and electric pump is for? if these parts maintain a given fuel pressure why have a return?
Yes return fuel line is a necesary. Fuel pump puts out enough fuel for the car at any throttle position at any load, when load is low the extra fuel needs to go back to the tank or the fuel pump would back up and burn out. There are other options of say using an inline fuel pump for EFI and using a coupler on your filler line to tank to get the excess fuel back to the tank. Instead of getting a fuel pump and return line in your stock tank. Cost wise I would say its a horse a piece, cleaner install being all in the tank IMO.
Return is necessary for earlier systems. the regulator is mounted on the fuel rail and is designed to unseat and return excess fuel back to the tank. The later mechanical returnless systems have the regulator in the fuel pump assembly in the tank and the excess dumps right back into the tank. The electronic returnless systems use a fuel pump driver module that is controlled by the PCM that provides a pulse width modulated voltage to the fuel pump itself, controlling pressure via current flow to the pump motor. The electronic type requires a feedback signal from the fuel rail pressure sensor and those systems are much more complicated than the old fashioned, more reliable, return systems. Still do-able, with the right amount of patience, knowledge and tuner support.
