hey guys ive decided to go to a cam that uses the HO firing order. and finally get off my lazy butt and install my gt40 heads also. my SO comp will need to be changed out. my car is still speed density so im thinking a lincoln lsc comp, 1988yr? or what yr stang comp?
Look for a DA-1 Mustang ECM. I see them from time to time here and Ebay. Others are available. $50 or so.
If you go with a "bigger than H.O" performance cam, you MAY need togo to Mass Air. If you are using an H.O cam, yeah, swap in the Mark VII ECM or a Speed Density Stang cam. All Mark VII's were speed density.
Fordfuelinjection.com
Great source of info regarding fuel injection on the Mustangs. I do know that the DE and DC are for automatic cars and the DA1 and DB1 are for manual cars.
With mass air Mustangs you can run an auto EEC on a manual or auto car and have zero issues however if you put a manual EEC in an auto car you will fry some of the traces on the board in the EEC. There are many discussions on this on the Mustang boards. I am not sure how this works with the speed density EEC's so that would need to be vetted out or at least I would want to if I were going this route.
The real issue is with the o2 sensor harness. For whatever reason the auto and manual o2 harness swaps wires around for some years.
Excellent point sir! They are year specific as well as auto/manual specific on the Mustangs and it was frustrating as all hell when I converted my 93 from a 4 cylinder over to a V8. I was fortunate enough to get the engine harness and O2 harness from a 92 manual car so it was plug and chug. I have no idea on the Birds, Cougars, and Mark VII's on the pin out of the O2 harnesses with respect to year and type of transmission.