Suzuki Sequential Fuel Injection

Defining Digital

In basic terms, digital reduces any process to basic, extremely precise numerical components. Analog, the antithesis of digital, utilizes imprecise, complicated physical representations - lengths, dimensions, spatial comparisons, etc.

EFI in the Marine Industry

Though Digital EFI can be found in almost every automobile on the road, in the marine outboard industry, Suzuki is the only manufacturer to offer a full line of digitally-controlled EFI Four Stroke engines, from the DF40 through DF300. Only through years of experience with Digital EFI systems in its automobiles and motorcycles has Suzuki been able to bring this technology to the marine outboard market.

Considering the rapid rate in which digital technology continues to permeate our society, it is only logical that Digital EFI will eventually become the system of choice for outboard motors as well. The Suzuki line of EFI Four Stroke outboards contain what will become the industry-wide norm.

Suzuki's state-of-the-art digital electronics technology, featured in each of these motors, monitors changing conditions on the water and in the motor, and maintains continuous access to a pre-programmed information "map." The Digital EFI system then responds instantly to any changes in throttle setting, atmospheric pressure, cylinder wall temperature, exhaust manifold temperature, air temperature and engine speed by adjusting the air/fuel mixture according to this map.

The four-strokes have incorporated a sequential multi-point fuel injection system. Fuel is delivered to the engine through four (six on V-6 engines) high-pressure injectors. These injectors have a delivery timing that is directly related to the ignition timing and crankshaft positioning. Fuel is released at each injector at separate times in conjunction with each revolution of the crankshaft. The result of all this high technology is an outboard motor that starts instantly in all weather conditions, runs cleaner and has a quicker and crisper throttle response under all types of loads.

Predictably, Suzuki's Digital EFI system accomplishes this much more accurately than analog-based injection systems. Analog systems - archaic by today's standards - must rely on "average" settings that lack the precision of digital-based controls when operating under the wide variety of conditions outboard motors face every day.


Currently Suzuki Marine enjoys its place as the technological leader among outboard manufacturers, and can always lay claim as the innovator of the Digital EFI system which will likely become a standard feature of all other outboard motors in the future. 

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