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  #1 (permalink)  
Old 01-16-2010, 04:32 AM
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Default 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?
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Old 01-16-2010, 10:22 AM
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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.
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Old 01-16-2010, 12:06 PM
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Why do systems like Accel and MoTeC require a cam sensor?
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Old 01-16-2010, 12:44 PM
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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
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Old 01-16-2010, 07:55 PM
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Any performance advantage of a sequential over a batch fired? Any advantage for just daily driver duties?
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Old 01-21-2010, 09:50 AM
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Quote:
Originally Posted by bobcowan View Post
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?
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Old 02-06-2010, 04:44 PM
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Quote:
Originally Posted by LodiWino View Post
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.
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Old 02-07-2010, 02:07 AM
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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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