Mustang ecu

[gambling209]

I am in the process of making a stand alone harness for my bronco out of a mustang speed density harness. The reason for speed density is i have a few of these computers and my motor is just an explorer motor with a mustang H.O cam. My question is: is there a difference in SD computers like there is in mass air computers. Meaning can i just swap to different mustang SD computers without changing anything else. I know you can’t with mass air (auto verse man). I have a couple DA1 and DC computers. Also mass air computers are getting harder to get and SD are not.

 

[DirtDonk]

Speed Density was batch-fire with just the ignition, correct? So the fuel injectors fire in the cam firing order sequence?
If that's the case then your fueling will be off by a bit too, because the HO and SD cams use different firing orders.

Other than that one question, I don't have any insight as to their interchangeability among themselves.

Good luck.

Paul

 

[gambling209]

No on firing. Mustang up to 89 were speed density. During the 89 model year they switched over to mass air. The cams are the same. You can add mass air to a SD harness. Just need plug, wiring, and mass air computer. My computers will work fine with my setup. Question is if i go from one computer to the other do i have to change anything. You do on mass air because of wiring differences.

 

[Timmy390]

I assume there are differences between the auto and stick transmissions. I know there is on the Mass Air cars. One or two wires bit I've read getting those wrong will burn the ECM.

Thought I had a wiring diagram bit I can't find it.

Tim

 

[gambling209]

I assume there are differences between the auto and stick transmissions. I know there is on the Mass Air cars. One or two wires bit I've read getting those wrong will burn the ECM.

Thought I had a wiring diagram bit I can't find it.

Tim

Thats what I’m talking about. The difference for mass air is in the O2 harness. Different pins on computer get power through that harness. I know the SD O2 harness is different than the mass air. So I don’t know if its the same. Not sure SD O2 harnesses differ from each other. Not a lot of SD info. Everybody wants mass air

 

[Broncobowsher]

Truck speed density was batch fire, car was still sequential. Even on speed density.
Don't know much else about different speed density computers.

 

[EricLar80]

I am in the process of making a stand alone harness for my bronco out of a mustang speed density harness. The reason for speed density is i have a few of these computers and my motor is just an explorer motor with a mustang H.O cam. My question is: is there a difference in SD computers like there is in mass air computers. Meaning can i just swap to different mustang SD computers without changing anything else. I know you can’t with mass air (auto verse man). I have a couple DA1 and DC computers. Also mass air computers are getting harder to get and SD are not.

You can still buy Mass Air computers off ebay, etc. You can get the already refurbished, or change the capacitors yourself. Very easy to do if you have a soldering iron.

 

[gambling209]

Yes you can still buy them. They are around 200 apiece. I have a couple fox mustangs that run them and have changed the capacitors in them. The last couple speed density computers i bought were $25 apiece.