is anyone running a speed density EFI setup? i was thinking of swapping this onto my maverick and was just wondering if anyone has done it and if there was anything specific that i needed to look for before i dive into it. any info is greatly appreciated
I've done several speed density aftermarket EFI conversions; FAST, Accel Gen VII, and Bigstuff3. Which system were you considering? Jody
i was actually considering the latest LTD/Crown Vic junkyard conversion due to price and availability
None of the aftermarket wiring harness are for speed density. You will have to use the harness from the junk yard car. Get all the eif stuff. I had mass air in my 89 Mustang GT. If you are not going to change the engine at all, speed density is OK, but if you want to add a cam, headers or intake, use the mass air from a 89 or newer mustang.
I did my own tuning on the Ford EECV computer in my Lightning, but that is mass air. I would think the tuning would be straightforward if you're familiar with tuning. I used the SCT Racer Pro software to do the tuning. Jody
havent done any tuning yet. im just wanting to get it up and running and then go for some tuning once everything is running good..
SD works very well. I would suggest a system out of a Lincoln Mark VII 88-92. Be awhere that you can't make a cam changes that get to long in durations and begins to lower the intake vacuum. Reason is the MAP sensor depends on the intake vacuum to fuel the engine correctly, unlike a Mass Air setup. I run a 5L SD with a Kenne Bell blower and works very nice. That's the way to get power without doing a lot of engine work.
well i just got everything i need for the swap today. all of it come from an '87 mercury grand marquis. i got the intake (both upper and lower), wiring, distributor, coil, ECM, all sensors & such. im running an edelbrock performer cam so i think i should be good to go. it doesnt have a long duration so i dont think it will interfere with my setup. and later down the road once everything is up and going, ill convert to mass air with larger injectors, throttle body and such. the only thing i need now is an external fuel pump and plumbing, which i plan to get underway this weekend. wish me luck
Just a little info I know on the Mustangs, the speed density cars are actually a little faster than the stock Mass air cars. You can get by with just about any upgrades except for anything over a b303 cam. I am running Twisted wedge heads, GT 40 intake, MAC shorty headers with a B303 cam on a 87 Mustang with speed density with no problems.I would stay with the stock HO cam for low end torque, it's really a pretty good cam.
MM, Im running a 88 SD 5.0 in my 69.5. The hard part is the wiring, but it is very easy to do!!! Think of each wire, like a highway,,, each wire has a route, and a number, some wires have intersections, some dont. Once you learn where the numbered wires go to, its a matter of time until you have all of your wiring harness made. Try not to make a harness out of a stock one,,,,,, wire deterioration is what happens and when you get to bending/flexing the old wiring to where you want it,,, soon the connections go bad and you have problems. Best to use a manual transmission,,,, the kick down linkage is a bear to figure out on the passenger side throttle bodies, not saying it cant be done, but its difficult. You have to remake your shock tower braces, the Upper plentumn is in the way,,,,, So far, I have built 3 custom harnesses, one was made from the factory harness, (worked but the wires started breaking) the second was built for my 69.5 mav, and the third was for a 95 ranger with the SD 5.0. I took the EFI off the maverick for now,,,, I had to get the ranger going, so I borrowed the manifold. I have a new one ready to go as soon as it warms up enough to put it all back together,,,, Got questions? ChadS
well i have rounded up just about every wiring schematic i can find and almost have my harness complete. im using the factory one from the donor car. all the wires seem fine and are not brittle at all. im down to just 2 small issues that im going thru right now.... 1. making sure i have the correct 12v+ wires in place along with the ignition wires, which isnt too bad since i took the harness out of the donor vehicle and left almost all the wires intact. the main ones i am double checking right now is the 12v run wire and 12v start wire. i found a very useful diagram at http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif 2. just found a fuel pump that will meet my requirements. the frame mounted one for an '88 F250 w/5.0 (part#:E2000 at Advance or auto-zone) as it produces a max of 45 psi and my system only requires 39 psi. i also plan to run the return line back thru the vent tube on top of the gas tank and im going to run my C4 trans at the moment so im not going to have any of the transmission issues to deal with as my trans doesnt even have a kick-down hooked up to it
BTW, if you have any diagrams or anything i would greatly appreciate it if u could email me a copy or so, since this is my first EFI and you have already successfully accomplished it. thanks for the advice
Here is the trick on the IGN circuit,,,,,, the computer runs the negative side of the coil, the hot +12 volt is to a key switched power source,,, the start wire from the distributor has to be hooked up to the start terminal on the solinoid for it to work. Did you leave the SPOUT connector in the harness? Good thing cause that is what you use to set the base timing at 10 deg adv. has to be 10 for a pretty much stock motor to make it run the best. I have alot of wiring diagrams for SD and MASS computers,,,, You also dont need the speed sensor onthe tranny,,, that was used in the manual transmission cars to help keep it running when the clutch was suddenly pushed in and the engine dont die. The TPS and the MAP sensors are pretty much all you need. Eliminate the EGR if you can,,,, I have the diagrams to do that as well. 3 resistors soldered together on 3 wires from the harness. Chad
