Suzuki Sequential Fuel Injection

The Digital Revolution increasingly dominated the 1990's, Suzuki Marine stepped forward as the marine industry's technological leader with Digital EFI.

Without a doubt, the 1990's had become the "digital decade," the ideal segue into the next century. Today, "digital" is a word that has permeated our lives, bringing about a revolution of burgeoning, wondrous technology. LPs have been replaced by digitally-recorded compact discs (CDs). Personal computers, using digital processing, are becoming virtual household appliances. Our cars are using digital technology to run ever cleaner and more efficiently. And now - thanks to Suzuki Marine - even outboard engines are benefiting from digital technology.

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.

Digital, by its very simplicity, has opened the door to new technologies which are dominating a variety of industries. The consumer electronics industry is at the forefront in offering the benefits of digital technology to the public. The music industry was introduced to the digital CD about 15 years ago. Today, the recording industry has also brought forth digital compact cassettes (DAT and DCC) and the Mini Disc (MD) format. In addition, there are now more digital sound processing systems such as "surround sound" for in-home entertainment.

Television, with the high definition TVs (HDTV), has become digitized. HDTV is generally regarded as the future of consumer television. In other areas, consumers are regularly seeing the results of new technologies through digital communication and processing. Recent films such as What Dreams May Come and Pleasantville, to name just a few, utilized digital enhancement techniques to simulate an image that was otherwise impossible to obtain.

One digital element that touches all of our lives every day is in the automobile. Nearly every car on the road today utilizes a digital electronic fuel injection system to precisely control air/fuel mixture. Other systems, such as those using carburetors, are now obsolete, considered "dinosaurs" by an auto industry striving to incorporate the latest technology into its products. That technology revolves around digital.

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.


There seems to be little doubt that the digital revolution is upon us, and that rather than fading away, its technological advantages will carry us into the next century and beyond. Analog communication is becoming obsolete on all but the most basic levels, as can be seen with the latest developments in consumer electronics, personal computers, telecommunications, automobiles and countless other industries.

This holds true for the marine market as well. 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 outboard motors in the future. As of the printing date of this guide, two other outboard manufacturers have entered the Digital Age - using a system similar to one that has been marketed by Suzuki Marine since 1990.

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