I thought this link might be of interest to those of you considering an EFI conversion.
Bob D

<A HREF="http://www.sdsefi.com/techseq.htm">http ... seq.htm</A>



BBobbias@aol.com

This does not tell the whole story. Ford sequential FI (current EECV, OBDII) fires the injectors at a closed intake valve. If you fire the injector on an open valve, some of the fuel will freeze on the back side of the valve and you will have poor control over A/F. At WOT where you have long pulsewidths, some of the injector shot occurs when the intake valve is open. On this system, you can run the injectors at 100% duty cycle. Each DFI system is different and unique. What you can do with one you cannot necessarily do with another. I can tell you the sequential does give better throttle response and cleaner emmissions, but not by much. You can get just about any batch fire system to pass any emmissions test currently used in the US. It will not, however, pass the rigorous EPA certification tests the car manufacturers have to pass.

Mitch


m5black@aol.com

Bob - the SDS from these guys is the one I'm using on my supercharged engine. I picked them for a couple or reasons:
1. they are in the same city as me and are very helpful/ interested in my project. They've offered to help me tune if I need it.
2. they have, as their name indicates, a practical approach and product. They've seen what is useful and what's just bells & whistles. I'll certainly be able to elaborate once I complete my project.

WRT sequential / batch, they do make the point that sequential EFI was required for new cars to pass the tests which I believe involves emissions during startup and low rpm. Low rpm emissions is where seq. provides a noticeable advantage.

On a progress note, my aluminum manifold is in the machine shop right now getting the injectors fitted as well as modifications to accept the air supply tube from the intercooler.

ahtoews@shaw.ca