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-   -   Electromotive DFI (http://www.clubcobra.com/forums/ignition/102109-electromotive-dfi.html)

LodiWino 01-16-2010 04:32 AM
Electromotive DFI
 
Electromotive uses a crank trigger ignition, but unless I am mistaken they do not use a cam sensor. So how does the system sense the ignition stroke from the exhaust stroke?

Sizzler 01-16-2010 10:22 AM
When you install the Electromotive ECM and access its program, you will be prompted for certain information, including number of cylinders and firing order. Then using the crank trigger information it can determine which cylinders are where in each of their cycles.

LodiWino 01-16-2010 12:06 PM
Why do systems like Accel and MoTeC require a cam sensor?

Sizzler 01-16-2010 12:44 PM
A cam sensor is used for true sequential injection. Generally considered an unnecessary complication except for OEM's who are rigid with concern about meeting emission requirements. Sequential systems fires injectors based on where each individual cylinder is at in its cycle. A batch-fired system will fire off fuel for a set of cylinders, 2 or 4 at a time usually in a V8.

For emissions a sequential system lets you tailor the fuel pulse delivery for each cylinder individually (also good for piggybacking on a cylinder deactivation system). Most sequential systems convert (within their programming) to a batch-fire system at some set rpm level.

Apparently you can add a cam position sensor to an Electromotive system to get a true sequential injection system, if you want. See page 20...

http://electromotive-inc.com/pdf_files/tec3.pdf

bobcowan 01-16-2010 07:55 PM
Any performance advantage of a sequential over a batch fired? Any advantage for just daily driver duties?

Sizzler 01-21-2010 09:50 AM
Quote:
Originally Posted by bobcowan (Post 1019197)
Any performance advantage of a sequential over a batch fired? Any advantage for just daily driver duties?

As far as I know, sequential operation ends at around 2500 rpm, so any benefits would be in the idle (800-1000) to 2500 range. Above that it goes to batch mode. So, if you think you could benefit somehow in that operating range, go for it.

OEM's went sequential because that was low-hanging fruit as far as cleaning up emissions goes. Maybe some benefit in the more 'unusual' intakes like weber IR's or maybe some intakes that have serious distribution issues cylinder-to-cylinder?

LoyWarr 02-06-2010 04:44 PM
Quote:
Originally Posted by LodiWino (Post 1018966)
Electromotive uses a crank trigger ignition, but unless I am mistaken they do not use a cam sensor. So how does the system sense the ignition stroke from the exhaust stroke?
They do allow for a cam sensor, but it is only used for the sequential fuel injection. The DFUs fire on both ignition and exhaust strokes. The exhaust stroke is wasted, that is why it is called a waste spark system.

Caprimaniac 02-07-2010 02:07 AM
Can anyone tell me how to and what cam position sensor should be fitted to a small block with aftermarket EFI? I see there is one OEM for 96-98 Explorer that goes in where the disrtibutor usually sits... Not very practical if you still want to run distributor ignition.

I'm considering the Edelbrock XT+- system/ manifold, and it seems like it cannot be run with EDIS?


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